In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False. (CVE-2020-6816) Regular expression denial of service. (CVE-2020-6817)
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For example, ``bleach.clean(..., attributes={'a': ['style']})``.\n\n### Patches\n\n3.1.4\n\n### Workarounds\n\n* do not whitelist the style attribute in `bleach.clean` calls\n\n* limit input string length\n\n### References\n\n* https://bugzilla.mozilla.org/show_bug.cgi?id=1623633\n* https://www.regular-expressions.info/redos.html\n* https://blog.r2c.dev/posts/finding-python-redos-bugs-at-scale-using-dlint-and-r2c/\n* https://vulners.com/cve/CVE-2020-6817\n\n### Credits\n\n* Reported by schwag09 of r2c\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Open an issue at https://github.com/mozilla/bleach/issues\n* Email us at security@mozilla.org", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2020-03-30T19:45:56", "type": "github", "title": "regular expression denial-of-service (ReDoS) in Bleach", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6817"], "modified": "2023-02-28T16:48:26", "id": "GHSA-VQHP-CXGC-6WMM", "href": "https://github.com/advisories/GHSA-vqhp-cxgc-6wmm", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2023-12-06T17:30:17", "description": "### Impact\n\nA [mutation XSS](https://cure53.de/fp170.pdf) affects users calling `bleach.clean` with all of:\n\n* the `svg` or `math` in the allowed/whitelisted tags\n* an RCDATA tag (see below) in the allowed/whitelisted tags\n* the keyword argument `strip=False`\n\n### Patches\n\nUsers are encouraged to upgrade to bleach v3.1.2 or greater.\n\n### Workarounds\n\n* modify `bleach.clean` calls to use `strip=True`, or not whitelist `math` or `svg` tags and one or more of the following tags:\n\n```\nscript\nnoscript\nstyle\nnoframes\nxmp\nnoembed\niframe\n```\n\n* A strong [Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) without `unsafe-inline` and `unsafe-eval` [`script-src`s](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src)) will also help mitigate the risk.\n\n### References\n\n* https://bugzilla.mozilla.org/show_bug.cgi?id=1621692\n* https://cure53.de/fp170.pdf\n* https://nvd.nist.gov/vuln/detail/CVE-2020-6816\n* https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach\n\n### Credits\n\n* Reported by [Yaniv Nizry](https://twitter.com/ynizry) from the CxSCA AppSec group at Checkmarx\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue at [https://github.com/mozilla/bleach/issues](https://github.com/mozilla/bleach/issues)\n* Email us at [security@mozilla.org](mailto:security@mozilla.org)", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1", "userInteraction": "REQUIRED"}, "impactScore": 2.7}, "published": "2020-03-24T15:06:32", "type": "github", "title": "mutation XSS via whitelisted math or svg and raw tag in Bleach", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2023-01-28T05:04:37", "id": "GHSA-M6XF-FQ7Q-8743", "href": "https://github.com/advisories/GHSA-m6xf-fq7q-8743", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "veracode": [{"lastseen": "2023-04-18T12:36:11", "description": "bleach is vulnerable to regular expression denial of service (ReDoS). The vulnerability exists when parsing style attributes through `sanitize_css`.\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2020-03-31T06:36:51", "type": "veracode", "title": "Regular Expression Denial-of-Service (ReDoS)", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2020-6817"], "modified": "2023-02-28T15:53:21", "id": "VERACODE:22839", "href": "https://sca.analysiscenter.veracode.com/vulnerability-database/security/1/1/sid-22839/summary", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2023-04-18T12:49:50", "description": "bleach is vulnerable to cross-site scripting (XSS). The `bleach.clean` behavior when parsing embedded MathML and SVG content with `RCDATA` tags did not match the browser behavior and can result in a mutation XSS.\n", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1", "userInteraction": "REQUIRED"}, "impactScore": 2.7}, "published": "2020-03-20T05:26:58", "type": "veracode", "title": "Cross-Site Scripting (XSS)", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2022-10-06T22:26:45", "id": "VERACODE:22749", "href": "https://sca.analysiscenter.veracode.com/vulnerability-database/security/1/1/sid-22749/summary", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "prion": [{"lastseen": "2023-11-22T01:45:07", "description": "bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2023-02-16T22:15:00", "type": "prion", "title": "Cross site scripting", "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6817"], "modified": "2023-02-28T14:46:00", "id": "PRION:CVE-2020-6817", "href": "https://www.prio-n.com/kb/vulnerability/CVE-2020-6817", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2023-11-22T01:45:08", "description": "In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.", "cvss3": {"cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1", "userInteraction": "REQUIRED"}}, "published": "2020-03-24T22:15:00", "type": "prion", "title": "Cross site scripting", "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "PARTIAL", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 5.8, "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 4.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2023-11-07T03:25:00", "id": "PRION:CVE-2020-6816", "href": "https://www.prio-n.com/kb/vulnerability/CVE-2020-6816", "cvss": {"score": 5.8, "vector": "AV:N/AC:M/Au:N/C:P/I:P/A:N"}}], "freebsd": [{"lastseen": "2023-12-06T16:51:40", "description": "\n\nBleach developers reports:\n\nbleach.clean behavior parsing style attributes could result in a\n\t regular expression denial of service (ReDoS).\nCalls to bleach.clean with an allowed tag with an allowed style\n\t attribute are vulnerable to ReDoS. For example, bleach.clean(...,\n\t attributes={'a': ['style']}).\n\n\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2019-03-09T00:00:00", "type": "freebsd", "title": "py-bleach -- regular expression denial-of-service", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6817"], "modified": "2019-03-09T00:00:00", "id": "4C52EC3C-86F3-11EA-B5B4-641C67A117D8", "href": "https://vuxml.freebsd.org/freebsd/4c52ec3c-86f3-11ea-b5b4-641c67a117d8.html", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "osv": [{"lastseen": "2023-04-11T01:47:09", "description": "### Impact\n\n`bleach.clean` behavior parsing style attributes could result in a regular expression denial of service (ReDoS).\n\nCalls to ``bleach.clean`` with an allowed tag with an allowed ``style`` attribute are vulnerable to ReDoS. For example, ``bleach.clean(..., attributes={'a': ['style']})``.\n\n### Patches\n\n3.1.4\n\n### Workarounds\n\n* do not whitelist the style attribute in `bleach.clean` calls\n\n* limit input string length\n\n### References\n\n* https://bugzilla.mozilla.org/show_bug.cgi?id=1623633\n* https://www.regular-expressions.info/redos.html\n* https://blog.r2c.dev/posts/finding-python-redos-bugs-at-scale-using-dlint-and-r2c/\n* https://vulners.com/cve/CVE-2020-6817\n\n### Credits\n\n* Reported by schwag09 of r2c\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Open an issue at https://github.com/mozilla/bleach/issues\n* Email us at security@mozilla.org", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2020-03-30T19:45:56", "type": "osv", "title": "regular expression denial-of-service (ReDoS) in Bleach", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2020-6817"], "modified": "2023-04-11T01:47:05", "id": "OSV:GHSA-VQHP-CXGC-6WMM", "href": "https://osv.dev/vulnerability/GHSA-vqhp-cxgc-6wmm", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2022-08-05T05:19:03", "description": "\nA vulnerability was discovered in python-bleach, a whitelist-based\nHTML-sanitizing library. Calls to bleach.clean with an allowed tag with\nan allowed style attribute are vulnerable to a regular expression denial\nof service (ReDoS).\n\n\nFor Debian 8 Jessie, this problem has been fixed in version\n1.4-1+deb8u1.\n\n\nWe recommend that you upgrade your python-bleach packages.\n\n\nFurther information about Debian LTS security advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: <https://wiki.debian.org/LTS>\n\n\n", "cvss3": {}, "published": "2020-04-01T00:00:00", "type": "osv", "title": "python-bleach - security update", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2020-6817"], "modified": "2022-08-05T05:18:44", "id": "OSV:DLA-2167-1", "href": "https://osv.dev/vulnerability/DLA-2167-1", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2022-05-11T21:11:08", "description": "In Mozilla Bleach before 3.1.4, `bleach.clean` behavior parsing style attributes could result in a regular expression denial of service (ReDoS).", "cvss3": {}, "published": "2020-03-30T19:45:00", "type": "osv", "title": "PYSEC-2020-340", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2020-6817"], "modified": "2022-01-05T02:16:12", "id": "OSV:PYSEC-2020-340", "href": "https://osv.dev/vulnerability/PYSEC-2020-340", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2023-03-28T05:24:57", "description": "### Impact\n\nA [mutation XSS](https://cure53.de/fp170.pdf) affects users calling `bleach.clean` with all of:\n\n* the `svg` or `math` in the allowed/whitelisted tags\n* an RCDATA tag (see below) in the allowed/whitelisted tags\n* the keyword argument `strip=False`\n\n### Patches\n\nUsers are encouraged to upgrade to bleach v3.1.2 or greater.\n\n### Workarounds\n\n* modify `bleach.clean` calls to use `strip=True`, or not whitelist `math` or `svg` tags and one or more of the following tags:\n\n```\nscript\nnoscript\nstyle\nnoframes\nxmp\nnoembed\niframe\n```\n\n* A strong [Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) without `unsafe-inline` and `unsafe-eval` [`script-src`s](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src)) will also help mitigate the risk.\n\n### References\n\n* https://bugzilla.mozilla.org/show_bug.cgi?id=1621692\n* https://cure53.de/fp170.pdf\n* https://nvd.nist.gov/vuln/detail/CVE-2020-6816\n* https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach\n\n### Credits\n\n* Reported by [Yaniv Nizry](https://twitter.com/ynizry) from the CxSCA AppSec group at Checkmarx\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue at [https://github.com/mozilla/bleach/issues](https://github.com/mozilla/bleach/issues)\n* Email us at [security@mozilla.org](mailto:security@mozilla.org)", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1", "userInteraction": "REQUIRED"}, "impactScore": 2.7}, "published": "2020-03-24T15:06:32", "type": "osv", "title": "mutation XSS via whitelisted math or svg and raw tag in Bleach", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2023-03-28T05:24:55", "id": "OSV:GHSA-M6XF-FQ7Q-8743", "href": "https://osv.dev/vulnerability/GHSA-m6xf-fq7q-8743", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2022-05-12T01:18:57", "description": "In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "baseScore": 6.1, "privilegesRequired": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "userInteraction": "REQUIRED", "version": "3.1"}, "impactScore": 2.7}, "published": "2020-03-24T22:15:00", "type": "osv", "title": "PYSEC-2020-28", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2021-03-30T23:15:00", "id": "OSV:PYSEC-2020-28", "href": "https://osv.dev/vulnerability/PYSEC-2020-28", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2022-08-10T07:07:07", "description": "\nIt was reported that python-bleach, a whitelist-based HTML-sanitizing\nlibrary, is prone to a mutation XSS vulnerability in bleach.clean when\nstrip=False and math or svg tags and one or more of the RCDATA tags\nwere whitelisted.\n\n\nFor the stable distribution (buster), this problem has been fixed in\nversion 3.1.2-0+deb10u1.\n\n\nWe recommend that you upgrade your python-bleach packages.\n\n\nFor the detailed security status of python-bleach please refer to its\nsecurity tracker page at:\n<https://security-tracker.debian.org/tracker/python-bleach>\n\n\n", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "baseScore": 6.1, "privilegesRequired": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "userInteraction": "REQUIRED", "version": "3.1"}, "impactScore": 2.7}, "published": "2020-03-20T00:00:00", "type": "osv", "title": "python-bleach - security update", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2022-08-10T07:07:02", "id": "OSV:DSA-4643-1", "href": "https://osv.dev/vulnerability/DSA-4643-1", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "debian": [{"lastseen": "2023-12-06T17:35:37", "description": "Package : python-bleach\nVersion : 1.4-1+deb8u1\nCVE ID : CVE-2020-6817\nDebian Bug : 955388\n\n\nA vulnerability was discovered in python-bleach, a whitelist-based\nHTML-sanitizing library. Calls to bleach.clean with an allowed tag with\nan allowed style attribute are vulnerable to a regular expression denial\nof service (ReDoS).\n\nFor Debian 8 "Jessie", this problem has been fixed in version\n1.4-1+deb8u1.\n\nWe recommend that you upgrade your python-bleach packages.\n\nFurther information about Debian LTS security advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://wiki.debian.org/LTS\nAttachment:\nsignature.asc\nDescription: PGP signature\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2020-04-01T17:53:31", "type": "debian", "title": "[SECURITY] [DLA 2167-1] python-bleach security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6817"], "modified": "2020-04-01T17:53:31", "id": "DEBIAN:DLA-2167-1:21AF1", "href": "https://lists.debian.org/debian-lts-announce/2020/04/msg00001.html", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2021-10-22T02:35:37", "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-4643-1 security@debian.org\nhttps://www.debian.org/security/ Salvatore Bonaccorso\nMarch 20, 2020 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : python-bleach\nCVE ID : CVE-2020-6816\nDebian Bug : 954236\n\nIt was reported that python-bleach, a whitelist-based HTML-sanitizing\nlibrary, is prone to a mutation XSS vulnerability in bleach.clean when\nstrip=False and 'math' or 'svg' tags and one or more of the RCDATA tags\nwere whitelisted.\n\nFor the stable distribution (buster), this problem has been fixed in\nversion 3.1.2-0+deb10u1.\n\nWe recommend that you upgrade your python-bleach packages.\n\nFor the detailed security status of python-bleach please refer to its\nsecurity tracker page at:\nhttps://security-tracker.debian.org/tracker/python-bleach\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "baseScore": 6.1, "privilegesRequired": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "userInteraction": "REQUIRED", "version": "3.1"}, "impactScore": 2.7}, "published": "2020-03-20T20:03:13", "type": "debian", "title": "[SECURITY] [DSA 4643-1] python-bleach security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2020-03-20T20:03:13", "id": "DEBIAN:DSA-4643-1:CB9C9", "href": "https://lists.debian.org/debian-security-announce/2020/msg00046.html", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2023-12-07T10:35:10", "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-4643-1 security@debian.org\nhttps://www.debian.org/security/ Salvatore Bonaccorso\nMarch 20, 2020 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : python-bleach\nCVE ID : CVE-2020-6816\nDebian Bug : 954236\n\nIt was reported that python-bleach, a whitelist-based HTML-sanitizing\nlibrary, is prone to a mutation XSS vulnerability in bleach.clean when\nstrip=False and 'math' or 'svg' tags and one or more of the RCDATA tags\nwere whitelisted.\n\nFor the stable distribution (buster), this problem has been fixed in\nversion 3.1.2-0+deb10u1.\n\nWe recommend that you upgrade your python-bleach packages.\n\nFor the detailed security status of python-bleach please refer to its\nsecurity tracker page at:\nhttps://security-tracker.debian.org/tracker/python-bleach\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1", "userInteraction": "REQUIRED"}, "impactScore": 2.7}, "published": "2020-03-20T20:03:13", "type": "debian", "title": "[SECURITY] [DSA 4643-1] python-bleach security update", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2020-03-20T20:03:13", "id": "DEBIAN:DSA-4643-1:BDA6D", "href": "https://lists.debian.org/debian-security-announce/2020/msg00046.html", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "cve": [{"lastseen": "2023-12-06T16:36:33", "description": "bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2023-02-16T22:15:00", "type": "cve", "title": "CVE-2020-6817", "cwe": ["CWE-1333"], "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6817"], "modified": "2023-02-28T14:46:00", "cpe": [], "id": "CVE-2020-6817", "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-6817", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}, "cpe23": []}, {"lastseen": "2023-12-06T16:36:35", "description": "In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1", "userInteraction": "REQUIRED"}, "impactScore": 2.7}, "published": "2020-03-24T22:15:00", "type": "cve", "title": "CVE-2020-6816", "cwe": ["CWE-79"], "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2023-11-07T03:25:00", "cpe": ["cpe:/o:fedoraproject:fedora:33"], "id": "CVE-2020-6816", "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-6816", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}, "cpe23": ["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"]}], "redhatcve": [{"lastseen": "2022-05-21T01:11:32", "description": "No description is available for this CVE.\n", "cvss3": {}, "published": "2022-05-21T00:05:30", "type": "redhatcve", "title": "CVE-2020-6817", "bulletinFamily": "info", "cvss2": {}, "cvelist": ["CVE-2020-6817"], "modified": "2022-05-21T00:05:30", "id": "RH:CVE-2020-6817", "href": "https://access.redhat.com/security/cve/cve-2020-6817", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2022-05-21T01:11:33", "description": "In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.\n", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1", "userInteraction": "REQUIRED"}, "impactScore": 2.7}, "published": "2022-05-20T23:42:16", "type": "redhatcve", "title": "CVE-2020-6816", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2022-05-20T23:42:16", "id": "RH:CVE-2020-6816", "href": "https://access.redhat.com/security/cve/cve-2020-6816", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "ubuntucve": [{"lastseen": "2023-12-08T13:27:19", "description": "bleach.clean behavior parsing style attributes could result in a regular\nexpression denial of service (ReDoS). Calls to bleach.clean with an allowed\ntag with an allowed style attribute are vulnerable to ReDoS. 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", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2020-04-30T02:51:57", "type": "fedora", "title": "[SECURITY] Fedora 30 Update: python-bleach-3.1.4-2.fc30", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6802", "CVE-2020-6817"], "modified": "2020-04-30T02:51:57", "id": "FEDORA:5D19B6309A15", "href": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4/", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "ibm": [{"lastseen": "2023-02-27T21:55:38", "description": "## Summary\n\nMultiple vulnerabilities have been found in the Bleach package, which is either built in to or distributed with IBM WMLCE.\n\n## Vulnerability Details\n\n** CVEID: **[CVE-2020-6816](<https://vulners.com/cve/CVE-2020-6816>) \n** DESCRIPTION: **Mozilla Bleach is vulnerable to cross-site scripting, caused by improper validation of user-supplied input by the bleach.clean. A remote attacker could exploit this vulnerability using the svg or math in the allowed/allowlisted tags to inject malicious script into a Web page which would be executed in a victim's Web browser within the security context of the hosting Web site, once the page is viewed. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials. \nCVSS Base score: 6.1 \nCVSS Temporal Score: See: [ https://exchange.xforce.ibmcloud.com/vulnerabilities/178671](<https://exchange.xforce.ibmcloud.com/vulnerabilities/178671>) for the current score. \nCVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) \n \n** CVEID: **[CVE-2020-6802](<https://vulners.com/cve/CVE-2020-6802>) \n** DESCRIPTION: **Mozilla Bleach is vulnerable to cross-site scripting, caused by improper validation of user-supplied input by the bleach.clean A remote attacker could exploit this vulnerability using a raw tag in the allowed/allowlisted tags option to inject malicious script into a Web page which would be executed in a victim's Web browser within the security context of the hosting Web site, once the page is viewed. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials. \nCVSS Base score: 6.1 \nCVSS Temporal Score: See: [ https://exchange.xforce.ibmcloud.com/vulnerabilities/178672](<https://exchange.xforce.ibmcloud.com/vulnerabilities/178672>) for the current score. \nCVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)\n\n## Affected Products and Versions\n\nAffected Product(s)| Version(s) \n---|--- \nIBM WML Community Edition| 1.6.2 \nIBM WML Community Edition| 1.7.0 \n \n\n\n## Remediation/Fixes\n\nAll IBM WMLCE distribution channels have been updated. For those using containers, pulling the image again from its upstream container registry (<https://hub.docker.com/r/ibmcom/powerai>, <https://catalog.redhat.com>, etc) will download an updated image with CVEs resolved. All others should update directly from our conda channel via `conda update`.\n\n## Workarounds and Mitigations\n\nNone\n\n## ", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "NETWORK", "availabilityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1", "userInteraction": "REQUIRED"}, "impactScore": 2.7}, "published": "2020-05-19T17:00:30", "type": "ibm", "title": "Security Bulletin: A security vulnerability has been identified in Bleach shipped with IBM Watson Machine Learning Community Edition (WMLCE)", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 8.6, "obtainAllPrivilege": false, "userInteractionRequired": true, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "NONE", "availabilityImpact": "NONE", "integrityImpact": "PARTIAL", "baseScore": 4.3, "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6802", "CVE-2020-6816"], "modified": "2020-05-19T17:00:30", "id": "5E9C6DD0800029B740BCACC7CC27F74E137E69E9A07B1C9DDF3C4712DB20997E", "href": "https://www.ibm.com/support/pages/node/6211861", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}]}
Updated python-bleach packages fix security vulnerability
