CVE-2022-41903

Published: 17 January 2023

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`.

Priority

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package	Release	Status
git Launchpad, Ubuntu, Debian	bionic	Released (1:2.17.1-1ubuntu0.15)
	focal	Released (1:2.25.1-1ubuntu3.8)
	jammy	Released (1:2.34.1-1ubuntu1.6)
	kinetic	Released (1:2.37.2-1ubuntu1.2)
	trusty	Ignored (out of standard support)
	upstream	Needs triage
	xenial	Released (1:2.7.4-0ubuntu1.10+esm4)

Severity score breakdown

Parameter	Value
Base score	9.8
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

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