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🛡️ CVE-2024-32021 — debian-linux

🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-547 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Local Git clone may hardlink arbitrary user-readable files into the new repository's "objects/" directory

Git is a revision control system. Prior to versions 2.45.1, 2.44.1, 2.43.4, 2.42.2, 2.41.1, 2.40.2, and 2.39.4, when cloning a local source repository that contains symlinks via the filesystem, Git may create hardlinks to arbitrary user-readable files on the same filesystem as the target repository in the objects/ directory. Cloning a local repository over the filesystem may creating hardlinks to arbitrary user-owned files on the same filesystem in the target Git repository's objects/ directory. When cloning a repository over the filesystem (without explicitly specifying the file:// protocol or --no-local), the optimizations for local cloning

will be used, which include attempting to hard link the object files instead of copying them. While the code includes checks against symbolic links in the source repository, which were added during the fix for CVE-2022-39253, these checks can still be raced because the hard link operation ultimately follows symlinks. If the object on the filesystem appears as a file during the check, and then a symlink during the operation, this will allow the adversary to bypass the check and create hardlinks in the destination objects directory to arbitrary, user-readable files. The problem has been patched in versions 2.45.1, 2.44.1, 2.43.4, 2.42.2, 2.41.1, 2.40.2, and 2.39.4.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity low, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:L

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: None.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2024-32021 is classified as CWE-547: Use of Hard-coded, Security-relevant Constants. The product uses hard-coded constants instead of symbolic names for security-critical values, which increases the likelihood of mistakes during code maintenance or security policy change.

Affected software

CVE-2024-32021 is recorded against 3 packages.

  • debian-linux
  • fedora
  • git

Timeline and source

Published on 14 May 2024 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

www.openwall.com
github.com
lists.debian.org
lists.fedoraproject.org
www.openwall.com
github.com
lists.debian.org
lists.debian.org
lists.fedoraproject.org

Other advisories for this package

debian-linux has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-547: Use of Hard-coded, Security-relevant Constants) in other software:

CVE-2024-32021 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity LOW
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:L
CWE CWE-547
Public Exploit ⚠️ Yes
Source NVD
Published 2024-05-14
Updated 2026-08-20
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
debian-linux — —
fedora — —
git — —

References

Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2024/05/14/2
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2024/05/14/2

Similar Threats

Exploit Protection

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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