cve-2021-21300
Vulnerability from cvelistv5
Published
2021-03-09 00:00
Modified
2024-08-03 18:09
Severity ?
8.0 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Summary
Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.
References
security-advisories@github.comhttp://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
security-advisories@github.comhttp://seclists.org/fulldisclosure/2021/Apr/60Mailing List, Third Party Advisory
security-advisories@github.comhttp://www.openwall.com/lists/oss-security/2021/03/09/3Exploit, Mailing List, Third Party Advisory
security-advisories@github.comhttps://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinksVendor Advisory
security-advisories@github.comhttps://git-scm.com/docs/gitattributes#_filterVendor Advisory
security-advisories@github.comhttps://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghmThird Party Advisory
security-advisories@github.comhttps://lists.debian.org/debian-lts-announce/2022/10/msg00014.htmlMailing List, Third Party Advisory
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/
security-advisories@github.comhttps://lore.kernel.org/git/xmqqim6019yd.fsf%40gitster.c.googlers.com/
security-advisories@github.comhttps://security.gentoo.org/glsa/202104-01Third Party Advisory
security-advisories@github.comhttps://support.apple.com/kb/HT212320Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2021/Apr/60Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/03/09/3Exploit, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinksVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://git-scm.com/docs/gitattributes#_filterVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghmThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/10/msg00014.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/
af854a3a-2127-422b-91ae-364da2661108https://lore.kernel.org/git/xmqqim6019yd.fsf%40gitster.c.googlers.com/
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202104-01Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT212320Third Party Advisory
Impacted products
Vendor Product Version
git git Version: >= 2.14.2, < 2.17.62.17.6
Version: >= 2.18.0, < 2.18.5
Version: >= 2.19.0, < 2.19.6
Version: >= 2.20.0, < 2.20.5
Version: >= 2.21.0, < 2.21.4
Version: >= 2.22.0, < 2.22.5
Version: >= 2.23.0, < 2.23.4
Version: >= 2.24.0, < 2.24.4
Version: >= 2.25.0, < 2.25.5
Version: >= 2.26.0, < 2.26.3
Version: >= 2.27.0, < 2.27.1
Version: >= 2.28.0, < 2.28.1
Version: >= 2.29.0, < 2.29.3
Version: >= 2.30.0, < 2.30.1
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         descriptions: "[{\"lang\": \"en\", \"value\": \"Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.\"}, {\"lang\": \"es\", \"value\": \"Git es un sistema de control de revisiones distribuido de c\\u00f3digo abierto.&#xa0;En las versiones afectadas de Git, un repositorio especialmente dise\\u00f1ado que contiene enlaces simb\\u00f3licos, as\\u00ed como archivos que usan un filtro clean/smudge como Git LFS, puede hacer que se ejecute un script reci\\u00e9n extra\\u00eddo mientras se clona en un sistema de archivos que no distingue entre may\\u00fasculas y min\\u00fasculas como NTFS , HFS+ o APFS (es decir, los sistemas de archivos predeterminados en Windows y macOS).&#xa0;Tome en cuenta que los filtros de clean/smudge deben ser configurados para eso.&#xa0;Git para Windows configura Git LFS por defecto y, por lo tanto, es vulnerable.&#xa0;El problema se ha corregido en las versiones publicadas el martes 9 de marzo de 2021. Como soluci\\u00f3n temporal, si el soporte de enlace simb\\u00f3lico est\\u00e1 deshabilitado en Git (por ejemplo, por medio de \\\"git config --global core.symlinks false\\\"), el ataque descrito no funcionar\\u00e1.&#xa0;Del mismo modo, si no se configuran globalmente filtros clean/smudge como Git LFS (es decir,_before_ cloning), el ataque se frustra.&#xa0;Como siempre, es mejor evitar la clonaci\\u00f3n de repositorios de fuentes no confiables.&#xa0;La primera versi\\u00f3n afectada es 2.14.2.&#xa0;Las versiones correctas son: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19 .6, 2.18.5, 2.17.62.17.6\"}]",
         id: "CVE-2021-21300",
         lastModified: "2024-11-21T05:47:58.407",
         metrics: "{\"cvssMetricV31\": [{\"source\": \"security-advisories@github.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N\", \"baseScore\": 8.0, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"scope\": \"CHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 1.6, \"impactScore\": 5.8}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.6, \"impactScore\": 5.9}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:H/Au:N/C:P/I:P/A:P\", \"baseScore\": 5.1, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"HIGH\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"PARTIAL\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 4.9, \"impactScore\": 6.4, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": true}]}",
         published: "2021-03-09T20:15:13.260",
         references: "[{\"url\": \"http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/Apr/60\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/03/09/3\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Exploit\", \"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://git-scm.com/docs/gitattributes#_filter\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/\", \"source\": \"security-advisories@github.com\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/\", \"source\": \"security-advisories@github.com\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/\", \"source\": \"security-advisories@github.com\"}, {\"url\": \"https://lore.kernel.org/git/xmqqim6019yd.fsf%40gitster.c.googlers.com/\", \"source\": \"security-advisories@github.com\"}, {\"url\": \"https://security.gentoo.org/glsa/202104-01\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://support.apple.com/kb/HT212320\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/Apr/60\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/03/09/3\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://git-scm.com/docs/gitattributes#_filter\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lore.kernel.org/git/xmqqim6019yd.fsf%40gitster.c.googlers.com/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://security.gentoo.org/glsa/202104-01\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://support.apple.com/kb/HT212320\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}]",
         sourceIdentifier: "security-advisories@github.com",
         vulnStatus: "Modified",
         weaknesses: "[{\"source\": \"security-advisories@github.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-59\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-59\"}]}]",
      },
      nvd: "{\"cve\":{\"id\":\"CVE-2021-21300\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2021-03-09T20:15:13.260\",\"lastModified\":\"2024-11-21T05:47:58.407\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.\"},{\"lang\":\"es\",\"value\":\"Git es un sistema de control de revisiones distribuido de código abierto.&#xa0;En las versiones afectadas de Git, un repositorio especialmente diseñado que contiene enlaces simbólicos, así como archivos que usan un filtro clean/smudge como Git LFS, puede hacer que se ejecute un script recién extraído mientras se clona en un sistema de archivos que no distingue entre mayúsculas y minúsculas como NTFS , HFS+ o APFS (es decir, los sistemas de archivos predeterminados en Windows y macOS).&#xa0;Tome en cuenta que los filtros de clean/smudge deben ser configurados para eso.&#xa0;Git para Windows configura Git LFS por defecto y, por lo tanto, es vulnerable.&#xa0;El problema se ha corregido en las versiones publicadas el martes 9 de marzo de 2021. Como solución temporal, si el soporte de enlace simbólico está deshabilitado en Git (por ejemplo, por medio de \\\"git config --global core.symlinks false\\\"), el ataque descrito no funcionará.&#xa0;Del mismo modo, si no se configuran globalmente filtros clean/smudge como Git LFS (es decir,_before_ cloning), el ataque se frustra.&#xa0;Como siempre, es mejor evitar la clonación de repositorios de fuentes no confiables.&#xa0;La primera versión afectada es 2.14.2.&#xa0;Las versiones correctas son: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19 .6, 2.18.5, 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   },
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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