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CVE-2021-21300

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Date: March 9, 2021

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.

Language: C

Severity Score

Related Resources (20)

https://support.apple.com/kb/HT212320
http://seclists.org/fulldisclosure/2021/Apr/60
https://security-tracker.debian.org/tracker/CVE-2021-21300
https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/
https://nvd.nist.gov/vuln/detail/CVE-2021-21300
https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks
https://security.gentoo.org/glsa/202104-01
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/
http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html
https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592
http://www.openwall.com/lists/oss-security/2021/03/09/3
https://access.redhat.com/security/cve/CVE-2021-21300
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-21300
https://security.alpinelinux.org/vuln/CVE-2021-21300
https://git-scm.com/docs/gitattributes#_filter
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/
https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm
https://lore.kernel.org/git/xmqqim6019yd.fsf@gitster.c.googlers.com/
https://www.mend.io/vulnerability-database/CVE-2021-21300

Severity Score

Weakness Type (CWE)

Link Following

CWE-59

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): HIGH
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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