## Severity
Medium
## Vendor
Canonical Ubuntu
## Versions Affected
* Canonical Ubuntu 14.04
* Canonical Ubuntu 16.04
* Canonical Ubuntu 18.04
## Description
Yunho Kim discovered that libxml2 incorrectly handled certain error conditions. A remote attacker could exploit this with a crafted XML file to cause a denial of service, or possibly cause libxml2 to expose sensitive information. This issue only affected Ubuntu 14.04 ESM, and Ubuntu 16.04 ESM. (CVE-2017-8872)
Zhipeng Xie discovered that libxml2 incorrectly handled certain XML schemas. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, and Ubuntu 18.04 LTS. (CVE-2019-20388)
It was discovered that libxml2 incorrectly handled invalid UTF-8 input. A remote attacker could possibly exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2020-24977)
It was discovered that libxml2 incorrectly handled invalid UTF-8 input. A remote attacker could possibly exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. (CVE-2021-3517)
It was discovered that libxml2 did not properly handle certain crafted XML files. A local attacker could exploit this with a crafted input to cause libxml2 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-3516, CVE-2021-3518)
It was discovered that libxml2 incorrectly handled error states. A remote attacker could exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. (CVE-2021-3537)
Sebastian Pipping discovered that libxml2 did not properly handle certain crafted XML files. A remote attacker could exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-3541)
CVEs contained in this USN include: CVE-2017-8872, CVE-2021-3516, CVE-2020-24977, CVE-2021-3541, CVE-2021-3537, CVE-2021-3517, CVE-2021-3518, CVE-2019-20388.
## Affected Cloud Foundry Products and Versions
_Severity is medium unless otherwise noted._
* Bionic Stemcells
* 1.x versions prior to 1.13
* All other stemcells not listed.
* cflinuxfs3
* All versions prior to 0.245.0
* CF Deployment
* All versions prior to 16.16.0
## Mitigation
Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:
* Bionic Stemcells
* Upgrade 1.x versions to 1.13 or greater
* All other stemcells should be upgraded to the latest version available on [bosh.io](<https://bosh.io/stemcells>).
* cflinuxfs3
* Upgrade all versions to 0.245.0 or greater
* CF Deployment
* Upgrade all versions to 16.16.0 or greater
## References
* [USN Notice](<https://usn.ubuntu.com/4991-1/>)
* [CVE-2017-8872](<https://vulners.com/cve/CVE-2017-8872>)
* [CVE-2021-3516](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3516>)
* [CVE-2020-24977](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-24977>)
* [CVE-2021-3541](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3541>)
* [CVE-2021-3537](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3537>)
* [CVE-2021-3517](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3517>)
* [CVE-2021-3518](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3518>)
* [CVE-2019-20388](<https://people.canonical.com/~ubuntu-security/cve/CVE-2019-20388>)
## History
2021-07-08: Initial vulnerability report published.
{"id": "CFOUNDRY:A2488D03CBE987233F934844F44A3BB5", "vendorId": null, "type": "cloudfoundry", "bulletinFamily": "software", "title": "USN-4991-1: libxml2 vulnerabilities | Cloud Foundry", "description": "## Severity\n\nMedium\n\n## Vendor\n\nCanonical Ubuntu\n\n## Versions Affected\n\n * Canonical Ubuntu 14.04\n * Canonical Ubuntu 16.04\n * Canonical Ubuntu 18.04\n\n## Description\n\nYunho Kim discovered that libxml2 incorrectly handled certain error conditions. A remote attacker could exploit this with a crafted XML file to cause a denial of service, or possibly cause libxml2 to expose sensitive information. This issue only affected Ubuntu 14.04 ESM, and Ubuntu 16.04 ESM. (CVE-2017-8872)\n\nZhipeng Xie discovered that libxml2 incorrectly handled certain XML schemas. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, and Ubuntu 18.04 LTS. (CVE-2019-20388)\n\nIt was discovered that libxml2 incorrectly handled invalid UTF-8 input. A remote attacker could possibly exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2020-24977)\n\nIt was discovered that libxml2 incorrectly handled invalid UTF-8 input. A remote attacker could possibly exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. (CVE-2021-3517)\n\nIt was discovered that libxml2 did not properly handle certain crafted XML files. A local attacker could exploit this with a crafted input to cause libxml2 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-3516, CVE-2021-3518)\n\nIt was discovered that libxml2 incorrectly handled error states. A remote attacker could exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. (CVE-2021-3537)\n\nSebastian Pipping discovered that libxml2 did not properly handle certain crafted XML files. A remote attacker could exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-3541)\n\nCVEs contained in this USN include: CVE-2017-8872, CVE-2021-3516, CVE-2020-24977, CVE-2021-3541, CVE-2021-3537, CVE-2021-3517, CVE-2021-3518, CVE-2019-20388.\n\n## Affected Cloud Foundry Products and Versions\n\n_Severity is medium unless otherwise noted._\n\n * Bionic Stemcells \n * 1.x versions prior to 1.13\n * All other stemcells not listed.\n * cflinuxfs3 \n * All versions prior to 0.245.0\n * CF Deployment \n * All versions prior to 16.16.0\n\n## Mitigation\n\nUsers of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:\n\n * Bionic Stemcells \n * Upgrade 1.x versions to 1.13 or greater\n * All other stemcells should be upgraded to the latest version available on [bosh.io](<https://bosh.io/stemcells>).\n * cflinuxfs3 \n * Upgrade all versions to 0.245.0 or greater\n * CF Deployment \n * Upgrade all versions to 16.16.0 or greater\n\n## References\n\n * [USN Notice](<https://usn.ubuntu.com/4991-1/>)\n * [CVE-2017-8872](<https://vulners.com/cve/CVE-2017-8872>)\n * [CVE-2021-3516](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3516>)\n * [CVE-2020-24977](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-24977>)\n * [CVE-2021-3541](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3541>)\n * [CVE-2021-3537](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3537>)\n * [CVE-2021-3517](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3517>)\n * [CVE-2021-3518](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3518>)\n * [CVE-2019-20388](<https://people.canonical.com/~ubuntu-security/cve/CVE-2019-20388>)\n\n## History\n\n2021-07-08: Initial vulnerability report published.\n", "published": "2021-07-08T00:00:00", "modified": "2021-07-08T00:00:00", "epss": [{"cve": "CVE-2017-8872", "epss": 0.00192, "percentile": 0.56642, "modified": "2023-12-03"}, {"cve": "CVE-2019-20388", "epss": 0.00797, "percentile": 0.79569, "modified": "2023-12-03"}, {"cve": "CVE-2020-24977", "epss": 0.00297, "percentile": 0.6587, "modified": "2023-12-03"}, {"cve": "CVE-2021-3516", "epss": 0.00126, "percentile": 0.46845, "modified": "2023-12-03"}, {"cve": "CVE-2021-3517", "epss": 0.00777, "percentile": 0.79239, "modified": "2023-12-03"}, {"cve": "CVE-2021-3518", "epss": 0.0035, "percentile": 0.68608, "modified": "2023-12-03"}, {"cve": "CVE-2021-3537", "epss": 0.00699, "percentile": 0.77956, "modified": "2023-12-03"}, {"cve": "CVE-2021-3541", "epss": 0.00081, "percentile": 0.33766, "modified": "2023-12-03"}], "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}, "cvss2": {"cvssV2": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "NONE", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "availabilityImpact": "PARTIAL", "baseScore": 7.5}, "severity": "HIGH", "exploitabilityScore": 10.0, "impactScore": 6.4, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "cvss3": {"cvssV3": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL"}, "exploitabilityScore": 3.9, "impactScore": 5.2}, "href": "https://www.cloudfoundry.org/blog/usn-4991-1/", "reporter": "Cloud Foundry", "references": [], "cvelist": ["CVE-2017-8872", "CVE-2019-20388", "CVE-2020-24977", "CVE-2021-3516", "CVE-2021-3517", "CVE-2021-3518", "CVE-2021-3537", "CVE-2021-3541"], "immutableFields": [], "lastseen": "2023-12-03T17:10:20", "viewCount": 10, "enchantments": {"dependencies": {"references": [{"type": "almalinux", "idList": ["ALSA-2020:4479", "ALSA-2021:1597", "ALSA-2021:2569"]}, {"type": "alpinelinux", "idList": ["ALPINE:CVE-2019-20388", "ALPINE:CVE-2020-24977", "ALPINE:CVE-2021-3517", "ALPINE:CVE-2021-3518", "ALPINE:CVE-2021-3537", "ALPINE:CVE-2021-3541"]}, {"type": "altlinux", "idList": ["2777060AF262CE012638411E1C9044B6", "33BC9B12459278B2E8AA2FCB5E629EE0", "B6930C49B0A0C5BB69C0C4C0448CAFB9"]}, {"type": "amazon", "idList": ["ALAS-2020-1438", "ALAS-2023-1743", "ALAS2-2020-1534", "ALAS2-2021-1662", "ALAS2-2021-1677", "ALAS2-2021-1718"]}, {"type": "apple", "idList": ["APPLE:1451472D328FDFE3DC99DD199D7D7CB9", "APPLE:45AD95C7804251FD775E15CAF7FF51C6", "APPLE:4B24B474978FAA0D4305A8A3C49C9CB5", "APPLE:6C809F398EB5C607CA9186D5B9CAEAFC", "APPLE:D1EFA282D15E4426E62FDDF4866ECA7F"]}, {"type": "archlinux", "idList": ["ASA-202011-15"]}, {"type": "attackerkb", "idList": ["AKB:EFF2BDE8-13EC-40D1-9F07-6C6AC4806059"]}, {"type": "cbl_mariner", "idList": ["CBLMARINER:1831", "CBLMARINER:2189", "CBLMARINER:4195", "CBLMARINER:4235", "CBLMARINER:4236"]}, {"type": "centos", "idList": ["CESA-2020:3996"]}, {"type": "cloudlinux", "idList": ["CLSA-2021:1640697315", "CLSA-2022:1641903536"]}, {"type": "cve", "idList": ["CVE-2017-8872", "CVE-2019-20388", "CVE-2020-24977", "CVE-2021-3516", "CVE-2021-3517", "CVE-2021-3518", "CVE-2021-3537", "CVE-2021-3541"]}, {"type": "debian", "idList": ["DEBIAN:DLA-2369-1:46D38", "DEBIAN:DLA-2369-1:E14AE", "DEBIAN:DLA-2653-1:1DB39", "DEBIAN:DLA-2669-1:F8CC1"]}, {"type": "debiancve", "idList": ["DEBIANCVE:CVE-2017-8872", "DEBIANCVE:CVE-2019-20388", "DEBIANCVE:CVE-2020-24977", "DEBIANCVE:CVE-2021-3516", "DEBIANCVE:CVE-2021-3517", "DEBIANCVE:CVE-2021-3518", "DEBIANCVE:CVE-2021-3537", "DEBIANCVE:CVE-2021-3541"]}, {"type": "f5", "idList": ["F5:K03179547"]}, {"type": "fedora", "idList": ["FEDORA:04BF76309A15", "FEDORA:1F4D830C7DBF", "FEDORA:210C430584A5", "FEDORA:345C8607A30C", "FEDORA:384B96390985", "FEDORA:404B730C2F75", "FEDORA:49CA3304C366", "FEDORA:4F60F30A106E", "FEDORA:5361730BB4C9", "FEDORA:591B130E1979", "FEDORA:72A4E3093B5E", "FEDORA:75CA430AA7A6", "FEDORA:790F1618AE54", "FEDORA:7FD9A309E3EF", "FEDORA:862DE30A5C4D", "FEDORA:9BC6C307F973", "FEDORA:B5B17313A0D2", "FEDORA:B8C523106DFF", "FEDORA:C9F463090F26", "FEDORA:CCFB3631D0F6"]}, {"type": "freebsd", "idList": ["524BD03A-BB75-11EB-BF35-080027F515EA", "76E59F55-4F7A-4887-BCB0-11604004163A", "F5ABAFC0-FCF6-11EA-8758-E0D55E2A8BF9"]}, {"type": "gentoo", "idList": ["GLSA-202010-04", "GLSA-202107-05"]}, {"type": "github", 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USN-4991-1: libxml2 vulnerabilities | Cloud Foundry
