title: Integer overflow in `git archive`, `git log --format` leading to RCE in git
description: 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`.
problem types: CWE-190: Integer Overflow or Wraparound
affected:
{
vendor: git
product: git
versions:
version: < 2.30.7, status: affected
version: >= 2.31.0, < 2.31.6, status: affected
version: >= 2.32.0, < 2.32.5, status: affected
version: >= 2.33.0, < 2.33.6, status: affected
version: >= 2.34.0, < 2.34.6, status: affected
version: >= 2.35.0, < 2.35.6, status: affected
version: >= 2.36.0, < 2.36.4, status: affected
version: >= 2.37.0, < 2.37.5, status: affected
version: >= 2.38.0, < 2.38.3, status: affected
version: = 2.39.0, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.8
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]