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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-21300 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html Exploit  Third Party Advisory  VDB Entry 
http://seclists.org/fulldisclosure/2021/Apr/60 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/03/09/3 Exploit  Mailing List  Third Party Advisory 
https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks Vendor Advisory 
https://git-scm.com/docs/gitattributes#_filter Vendor Advisory 
https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592 Patch  Third Party Advisory 
https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/
https://lore.kernel.org/git/xmqqim6019yd.fsf%40gitster.c.googlers.com/
https://security.gentoo.org/glsa/202104-01 Third Party Advisory 
https://support.apple.com/kb/HT212320 Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-59 Improper Link Resolution Before File Access ('Link Following') cwe source acceptance level NIST   GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

17 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-21300
NVD Published Date:
03/09/2021
NVD Last Modified:
11/06/2023
Source:
GitHub, Inc.