CVE-2023-25815

NameCVE-2023-25815
DescriptionIn Git for Windows, the Windows port of Git, no localized messages are shipped with the installer. As a consequence, Git is expected not to localize messages at all, and skips the gettext initialization. However, due to a change in MINGW-packages, the `gettext()` function's implicit initialization no longer uses the runtime prefix but uses the hard-coded path `C:\mingw64\share\locale` to look for localized messages. And since any authenticated user has the permission to create folders in `C:\` (and since `C:\mingw64` does not typically exist), it is possible for low-privilege users to place fake messages in that location where `git.exe` will pick them up in version 2.40.1. This vulnerability is relatively hard to exploit and requires social engineering. For example, a legitimate message at the end of a clone could be maliciously modified to ask the user to direct their web browser to a malicious website, and the user might think that the message comes from Git and is legitimate. It does require local write access by the attacker, though, which makes this attack vector less likely. Version 2.40.1 contains a patch for this issue. Some workarounds are available. Do not work on a Windows machine with shared accounts, or alternatively create a `C:\mingw64` folder and leave it empty. Users who have administrative rights may remove the permission to create folders in `C:\`.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1034835

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
git (PTS)buster1:2.20.1-2+deb10u3vulnerable
buster (security)1:2.20.1-2+deb10u8vulnerable
bullseye (security), bullseye1:2.30.2-1+deb11u2vulnerable
bookworm1:2.39.2-1.1vulnerable
trixie1:2.43.0-1fixed
sid1:2.45.2-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
gitsource(unstable)1:2.40.1-11034835

Notes

[bookworm] - git <no-dsa> (Minor issue)
[bullseye] - git <no-dsa> (Minor issue)
[buster] - git <no-dsa> (Minor issue)
https://lore.kernel.org/lkml/xmqqa5yv3n93.fsf@gitster.g/
https://github.com/git/git/commit/c4137be0f5a6edf9a9044e6e43ecf4468c7a4046 (v2.30.9)

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