CVE-2021-21300 (GCVE-0-2021-21300)

Vulnerability from cvelistv5 – Published: 2021-03-09 00:00 – Updated: 2024-08-03 18:09
VLAI?
Title
malicious repositories can execute remote code while cloning
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.
Severity ?
8 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
Impacted products
Vendor Product Version
git git Affected: >= 2.14.2, < 2.17.62.17.6
Affected: >= 2.18.0, < 2.18.5
Affected: >= 2.19.0, < 2.19.6
Affected: >= 2.20.0, < 2.20.5
Affected: >= 2.21.0, < 2.21.4
Affected: >= 2.22.0, < 2.22.5
Affected: >= 2.23.0, < 2.23.4
Affected: >= 2.24.0, < 2.24.4
Affected: >= 2.25.0, < 2.25.5
Affected: >= 2.26.0, < 2.26.3
Affected: >= 2.27.0, < 2.27.1
Affected: >= 2.28.0, < 2.28.1
Affected: >= 2.29.0, < 2.29.3
Affected: >= 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\u0027t 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.\u0026#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).\u0026#xa0;Tome en cuenta que los filtros de clean/smudge deben ser configurados para eso.\u0026#xa0;Git para Windows configura Git LFS por defecto y, por lo tanto, es vulnerable.\u0026#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.\u0026#xa0;Del mismo modo, si no se configuran globalmente filtros clean/smudge como Git LFS (es decir,_before_ cloning), el ataque se frustra.\u0026#xa0;Como siempre, es mejor evitar la clonaci\\u00f3n de repositorios de fuentes no confiables.\u0026#xa0;La primera versi\\u00f3n afectada es 2.14.2.\u0026#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",
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      "published": "2021-03-09T20:15:13.260",
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    "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\u0027t 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.\u0026#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).\u0026#xa0;Tome en cuenta que los filtros de clean/smudge deben ser configurados para eso.\u0026#xa0;Git para Windows configura Git LFS por defecto y, por lo tanto, es vulnerable.\u0026#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.\u0026#xa0;Del mismo modo, si no se configuran globalmente filtros clean/smudge como Git LFS (es decir,_before_ cloning), el ataque se frustra.\u0026#xa0;Como siempre, es mejor evitar la clonaci\u00f3n de repositorios de fuentes no confiables.\u0026#xa0;La primera versi\u00f3n afectada es 2.14.2.\u0026#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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Advisory\"]},{\"url\":\"https://support.apple.com/kb/HT212320\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.