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.
#### Bugs
* <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954236>
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"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"}, "impactScore": 2.9, "acInsufInfo": false, "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": "2023-01-10T06:35:20", "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": 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"acInsufInfo": false, "impactScore": 2.9, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2020-10-23T22:20:49", "id": "FEDORA:EEC4A313C6AC", "href": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "github": [{"lastseen": "2023-01-13T05:07:23", "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": 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"impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-6816"], "modified": "2023-01-13T05:02:05", "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"}}], "debiancve": [{"lastseen": "2023-01-15T06:08:25", "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": "debiancve", "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": "2020-03-24T22:15:00", "id": "DEBIANCVE:CVE-2020-6816", "href": "https://security-tracker.debian.org/tracker/CVE-2020-6816", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "cve": [{"lastseen": "2022-10-06T22:54:38", "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": "2022-10-06T20:45:00", "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:*:*:*:*:*:*:*"]}], "mageia": [{"lastseen": "2022-04-18T11:19:34", "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. (CVE-2020-6816) Regular expression denial of service. (CVE-2020-6817) \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": "2020-04-20T14:02:32", "type": "mageia", "title": "Updated python-bleach packages fix security vulnerability\n", "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", "CVE-2020-6817"], "modified": "2020-04-20T14:02:32", "id": "MGASA-2020-0176", "href": "https://advisories.mageia.org/MGASA-2020-0176.html", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}], "ibm": [{"lastseen": "2022-09-26T13:49:01", "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](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=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](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=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## Get Notified about Future Security Bulletins\n\nSubscribe to [My Notifications](< http://www-01.ibm.com/software/support/einfo.html>) to be notified of important product support alerts like this.\n\n### References \n\n[Complete CVSS v3 Guide](<http://www.first.org/cvss/user-guide> \"Link resides outside of ibm.com\" ) \n[On-line Calculator v3](<http://www.first.org/cvss/calculator/3.0> \"Link resides outside of ibm.com\" )\n\nOff \n\n## Related Information\n\n[IBM Secure Engineering Web Portal](<http://www.ibm.com/security/secure-engineering/bulletins.html>) \n[IBM Product Security Incident Response Blog](<http://www.ibm.com/blogs/psirt>)\n\n## Change History\n\n18 May 2020: Initial Publication\n\n*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.\n\n## Disclaimer\n\nAccording to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an \"industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response.\" IBM PROVIDES THE CVSS SCORES \"\"AS IS\"\" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. \"Affected Products and Versions\" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.\n\n## Document Location\n\nWorldwide\n\n[{\"Business Unit\":{\"code\":\"BU053\",\"label\":\"Cloud & Data Platform\"},\"Product\":{\"code\":\"SGLMYS\",\"label\":\"IBM PowerAI\"},\"Component\":\"\",\"Platform\":[{\"code\":\"PF043\",\"label\":\"Red Hat\"},{\"code\":\"PF031\",\"label\":\"Ubuntu\"}],\"Version\":\"1.6.2, 1.7.0\",\"Edition\":\"\",\"Line of Business\":{\"code\":\"LOB10\",\"label\":\"Data and AI\"}}]", "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"}}], "suse": [{"lastseen": "2022-11-06T12:09:19", "description": "An update that fixes three vulnerabilities is now available.\n\nDescription:\n\n This update for python-bleach fixes the following issues:\n\n - CVE-2021-23980: Fixed mutation XSS on bleach.clean with specific\n combinations of allowed tags (boo#1184547)\n\n Update to 3.1.5:\n\n * replace missing ``setuptools`` dependency with ``packaging``. Thank you\n Benjamin Peterson.\n\n Update to 3.1.4 (boo#1168280, CVE-2020-6817):\n\n * ``bleach.clean`` behavior parsing style attributes could result in a\n regular expression denial of service (ReDoS). Calls to ``bleach.clean``\n with an allowed tag with an allowed ``style`` attribute were vulnerable\n to ReDoS. For example, ``bleach.clean(..., attributes={'a':\n ['style']})``.\n * Style attributes with dashes, or single or double quoted values are\n cleaned instead of passed through.\n\n update to 3.1.3 (boo#1167379, CVE-2020-6816):\n\n * Add relative link to code of conduct. (#442)\n * Drop deprecated 'setup.py test' support. (#507)\n * Fix typo: curren -> current in tests/test_clean.py (#504)\n * Test on PyPy 7\n * Drop test support for end of life Python 3.4\n * ``bleach.clean`` behavior parsing embedded MathML and SVG content with\n RCDATA tags did not match browser behavior and could result in a\n mutation XSS. Calls to ``bleach.clean`` with ``strip=False`` and\n ``math`` or ``svg`` tags and one or more of the RCDATA tags ``script``,\n ``noscript``, ``style``, ``noframes``, ``iframe``, ``noembed``, or\n ``xmp`` in the allowed tags whitelist were vulnerable to a mutation XSS.\n\n\nPatch Instructions:\n\n To install this openSUSE Security Update use the SUSE recommended installation methods\n like YaST online_update or \"zypper patch\".\n\n Alternatively you can run the command listed for your product:\n\n - openSUSE Leap 15.2:\n\n zypper in -t patch openSUSE-2021-552=1", "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": "2021-04-14T00:00:00", "type": "suse", "title": "Security update for python-bleach (important)", "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", "CVE-2020-6817", "CVE-2021-23980"], "modified": "2021-04-14T00:00:00", "id": "OPENSUSE-SU-2021:0552-1", "href": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/YFAKMJGUZHUTZ53ZAID6PRVP5MSLXPGV/", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2022-11-10T02:12:07", "description": "An update that fixes three vulnerabilities is now available.\n\nDescription:\n\n This update for python-bleach fixes the following issues:\n\n - CVE-2021-23980: Fixed mutation XSS on bleach.clean with specific\n combinations of allowed tags (boo#1184547)\n\n Update to 3.1.5:\n\n * replace missing ``setuptools`` dependency with ``packaging``. Thank you\n Benjamin Peterson.\n\n Update to 3.1.4 (boo#1168280, CVE-2020-6817):\n\n * ``bleach.clean`` behavior parsing style attributes could result in a\n regular expression denial of service (ReDoS). Calls to ``bleach.clean``\n with an allowed tag with an allowed ``style`` attribute were vulnerable\n to ReDoS. For example, ``bleach.clean(..., attributes={'a':\n ['style']})``.\n * Style attributes with dashes, or single or double quoted values are\n cleaned instead of passed through.\n\n update to 3.1.3 (boo#1167379, CVE-2020-6816):\n\n * Add relative link to code of conduct. (#442)\n * Drop deprecated 'setup.py test' support. (#507)\n * Fix typo: curren -> current in tests/test_clean.py (#504)\n * Test on PyPy 7\n * Drop test support for end of life Python 3.4\n * ``bleach.clean`` behavior parsing embedded MathML and SVG content with\n RCDATA tags did not match browser behavior and could result in a\n mutation XSS. Calls to ``bleach.clean`` with ``strip=False`` and\n ``math`` or ``svg`` tags and one or more of the RCDATA tags ``script``,\n ``noscript``, ``style``, ``noframes``, ``iframe``, ``noembed``, or\n ``xmp`` in the allowed tags whitelist were vulnerable to a mutation XSS.\n\n This update was imported from the openSUSE:Leap:15.2:Update update project.\n\n\nPatch Instructions:\n\n To install this openSUSE Security Update use the SUSE recommended installation methods\n like YaST online_update or \"zypper patch\".\n\n Alternatively you can run the command listed for your product:\n\n - openSUSE Backports SLE-15-SP2:\n\n zypper in -t patch openSUSE-2021-571=1", "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": "2021-04-18T00:00:00", "type": "suse", "title": "Security update for python-bleach (important)", "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", "CVE-2020-6817", "CVE-2021-23980"], "modified": "2021-04-18T00:00:00", "id": "OPENSUSE-SU-2021:0571-1", "href": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/UAZHEWM4ZYBZY5GDDDOMIZYEGFNANLKS/", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}]}
CVE-2020-6816
