CVE-2021-21300

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2021-21300", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "dateUpdated": "2024-08-03T18:09:15.850Z", "dateReserved": "2020-12-22T00:00:00.000Z", "datePublished": "2021-03-09T00:00:00.000Z"}, "containers": {"cna": {"title": "malicious repositories can execute remote code while cloning", "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2022-10-11T00:00:00.000Z"}, "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."}], "affected": [{"vendor": "git", "product": "git", "versions": [{"version": ">= 2.14.2, < 2.17.62.17.6", "status": "affected"}, {"version": ">= 2.18.0, < 2.18.5", "status": "affected"}, {"version": ">= 2.19.0, < 2.19.6", "status": "affected"}, {"version": ">= 2.20.0, < 2.20.5", "status": "affected"}, {"version": ">= 2.21.0, < 2.21.4", "status": "affected"}, {"version": ">= 2.22.0, < 2.22.5", "status": "affected"}, {"version": ">= 2.23.0, < 2.23.4", "status": "affected"}, {"version": ">= 2.24.0, < 2.24.4", "status": "affected"}, {"version": ">= 2.25.0, < 2.25.5", "status": "affected"}, {"version": ">= 2.26.0, < 2.26.3", "status": "affected"}, {"version": ">= 2.27.0, < 2.27.1", "status": "affected"}, {"version": ">= 2.28.0, < 2.28.1", "status": "affected"}, {"version": ">= 2.29.0, < 2.29.3", "status": "affected"}, {"version": ">= 2.30.0, < 2.30.1", 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{}

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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": "2026-06-17T03:35:14.770", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "HIGH", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.1, "confidentialityImpact": "PARTIAL", "integrityImpact": 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"privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-03-09T20:15:13.260", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html"}, {"source": "security-advisories@github.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2021/Apr/60"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/03/09/3"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks"}, 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{"acknowledgement": "Red Hat would like to thank Matheus Tavares for reporting this issue.", "bugzilla": {"description": "git: remote code execution during clone operation on case-insensitive filesystems", "id": "1935158", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1935158"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-59", "details": ["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.", "A flaw was found in git, in which a specially-crafted repository that contains a symbolic link may cause just-checked out script to be executed while cloning."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2021-21300", "package_state": [{"cpe": "cpe:/a:redhat:jboss_developer_studio:12.", "fix_state": "Not affected", "package_name": "git", "product_name": "Red Hat CodeReady Studio 12"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "git", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "git", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "git", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "git", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:3.11", "fix_state": "Not affected", "package_name": "jenkins-2-plugins", "product_name": "Red Hat OpenShift Container Platform 3.11"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "jenkins-2-plugins", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Will not fix", "package_name": "rh-git218-git", "product_name": "Red Hat Software Collections"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Will not fix", "package_name": "rh-git227-git", "product_name": "Red Hat Software Collections"}], "public_date": "2021-03-09T18:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-21300\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-21300"], "statement": "This vulnerability affects case-insensitive file systems, therefore typical Linux scenarios should be safe. However, as per upstream, exploitation is even possible on Linux under certain circumstances.\nRed Hat CodeReady Studio 12 is not affected by this flaw because Jboss Forge Addon uses jgit which is a different (Java) git implementation than git itself.\nIn RHEL-8.6 and above, we currently provide git-2.31.x and later versions, which are not impacted by CVE-2021-21300. The vulnerability affects versions prior git-2.30.1.", "threat_severity": "Moderate"}

{}