Integer overflow in Git
CVE-2022-41903
Git is distributed revision control system. `git log` can display commits in an arbitrary format using its `--format` specifiers. This functionality is also exposed to `git archive` via the `export-subst` gitattribute. When processing the padding operators, there is a integer overflow in `pretty.c::format_and_pad_commit()` where a `size_t` is stored improperly as an `int`, and then added as an offset to a `memcpy()`. This overflow can be triggered directly by a user running a command which invokes the commit formatting machinery (e.g., `git log --format=...`). It may also be triggered indirectly through git archive via the export-subst mechanism, which expands format specifiers inside of files within the repository during a git archive. This integer overflow can result in arbitrary heap writes, which may result in arbitrary code execution. The problem has been patched in the versions published on 2023-01-17, going back to v2.30.7. Users are advised to upgrade. Users who are unable to upgrade should disable `git archive` in untrusted repositories. If you expose git archive via `git daemon`, disable it by running `git config --global daemon.uploadArch false`.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.443 (98.7th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.443 · newest: 0.443 · change: 0.000
Affected products
- Git — versions < 2.30.7, >= 2.31.0, < 2.31.6, >= 2.32.0, < 2.32.5
- Git-Scm Git — versions 2.39.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/git/git/security/advisories/GHSA-475x-2q3q-hvwq (Third Party Advisory)
- github.com/git/git/commit/508386c6c5857b4faa2c3e491f422c98cc69ae76 (Patch, Third Party Advisory, Release Notes)
- git-scm.com/book/en/v2/Customizing-Git-Git-Attributes (Vendor Advisory)
- git-scm.com/docs/pretty-formats (Vendor Advisory)
- security.gentoo.org/glsa/202312-15
Frequently asked questions
- What is CVE-2022-41903?
- CVE-2022-41903 is a critical-severity vulnerability in Git, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2023-01-17.
- How severe is CVE-2022-41903?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2022-41903 known to be exploited?
- 19 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.