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CVE
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CVE-2021-21300Date: (C)2021-03-10   (M)2023-12-22


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 7.5CVSS Score : 5.1
Exploit Score: 1.6Exploit Score: 4.9
Impact Score: 5.9Impact Score: 6.4
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: HIGHAccess Complexity: HIGH
Privileges Required: NONEAuthentication: NONE
User Interaction: REQUIREDConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: PARTIAL
Confidentiality: HIGHAvailability: PARTIAL
Integrity: HIGH 
Availability: HIGH 
  
Reference:
http://seclists.org/fulldisclosure/2021/Apr/60
FEDORA-2021-03e61a6647
FEDORA-2021-63fcbd126e
FEDORA-2021-ffd0b2108d
GLSA-202104-01
https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html
http://www.openwall.com/lists/oss-security/2021/03/09/3
http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html
https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks
https://git-scm.com/docs/gitattributes#_filter
https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592
https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm
https://lore.kernel.org/git/xmqqim6019yd.fsf%40gitster.c.googlers.com/
https://support.apple.com/kb/HT212320

CPE    1
cpe:/a:apple:xcode
CWE    1
CWE-59
OVAL    15
oval:org.secpod.oval:def:70017
oval:org.secpod.oval:def:70559
oval:org.secpod.oval:def:71564
oval:org.secpod.oval:def:71563
...

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