Medium · published February 15, 2023
Git is a revision control system. Using a specially-crafted repository, Git prior to versions 2.39.2, 2.38.4, 2.37.6, 2.36.5, 2.35.7, 2.34.7, 2.33.7, 2.32.6, 2.31.7, and 2.30.8 can be tricked into using its local clone optimization even when using a non-local transport. Though Git will abort local clones whose source `$GIT_DIR/objects` directory contains symbolic links, the `objects` directory itself may still be a symbolic link. These two may be combined to include arbitrary files based on known paths on the victim's filesystem within the malicious repository's working copy, allowing for data exfiltration in a similar manner as CVE-2022-39253.
A fix has been prepared and will appear in v2.39.2 v2.38.4 v2.37.6 v2.36.5 v2.35.7 v2.34.7 v2.33.7 v2.32.6, v2.31.7 and v2.30.8. If upgrading is impractical, two short-term workarounds are available. Avoid cloning repositories from untrusted sources with `--recurse-submodules`. Instead, consider cloning repositories without recursively cloning their submodules, and instead run `git submodule update` at each layer. Before doing so, inspect each new `.gitmodules` file to ensure that it does not contain suspicious module URLs.
| Product | Versions | Fixed in |
|---|---|---|
| git-scm/git | < 2.30.8 | 2.30.8 |
| git-scm/git | ≥ 2.31.0, < 2.31.7 | 2.31.7 |
| git-scm/git | ≥ 2.32.0, < 2.32.6 | 2.32.6 |
| git-scm/git | ≥ 2.33.0, < 2.33.7 | 2.33.7 |
| git-scm/git | ≥ 2.34.0, < 2.34.7 | 2.34.7 |
| git-scm/git | ≥ 2.35.0, < 2.35.7 | 2.35.7 |
| git-scm/git | ≥ 2.36.0, < 2.36.5 | 2.36.5 |
| git-scm/git | ≥ 2.37.0, < 2.37.6 | 2.37.6 |
| git-scm/git | ≥ 2.38.0, < 2.38.4 | 2.38.4 |
| git-scm/git | ≥ 2.39.0, < 2.39.2 | 2.39.2 |