Vulnerability · Published Oct 19, 2022 · Assigned by GitHub_M
CVE-2022-39253Git subject to exposure of sensitive information via local clone of symbolic links
Medium 5.5
In plain English
A medium-severity information exposure in git from git. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
Git is an open source, scalable, distributed revision control system. Versions prior to 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4 are subject to exposure of sensitive information to a malicious actor. When performing a local clone (where the source and target of the clone are on the same volume), Git copies the contents of the source's `$GIT_DIR/objects` directory into the destination by either creating hardlinks to the source contents, or copying them (if hardlinks are disabled via `--no-hardlinks`). A malicious actor could convince a victim to clone a repository with a symbolic link pointing at sensitive information on the victim's machine. This can be done either by having the victim clone a malicious repository on the same machine, or having them clone a malicious repository embedded as a bare repository via a submodule from any source, provided they clone with the `--recurse-submodules` option. Git does not create symbolic links in the `$GIT_DIR/objects` directory. The problem has been patched in the versions published on 2022-10-18, and backported to v2.30.x. Potential workarounds: Avoid cloning untrusted repositories using the `--local` optimization when on a shared machine, either by passing the `--no-local` option to `git clone` or cloning from a URL that uses the `file://` scheme. Alternatively, avoid cloning repositories from untrusted sources with `--recurse-submodules` or run `git config --global protocol.file.allow user`.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | git | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-all | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-all | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-core | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-core | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-core-doc | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-core-doc | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-credential-libsecret | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-credential-libsecret | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-daemon | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-daemon | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-email | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-email | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-gui | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-gui | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-instaweb | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-instaweb | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-subtree | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-subtree | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | git-svn | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | git-svn | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | gitk | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | gitk | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | gitweb | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | gitweb | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | perl-Git | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | perl-Git | 2.39.1-1.el9 | ALSA-2023:2319 |
| AlmaLinux:8 | perl-Git-SVN | 2.39.1-1.el8 | ALSA-2023:2859 |
| AlmaLinux:9 | perl-Git-SVN | 2.39.1-1.el9 | ALSA-2023:2319 |
| Alpine:v3.20 | docker | 20.10.20-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.21 | docker | 20.10.20-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.22 | docker | 20.10.20-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.23 | docker | 20.10.20-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.24 | docker | 20.10.20-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.20 | docker-cli-compose | 2.12.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.21 | docker-cli-compose | 2.12.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.22 | docker-cli-compose | 2.12.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.23 | docker-cli-compose | 2.12.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.24 | docker-cli-compose | 2.12.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.20 | git | 2.38.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.21 | git | 2.38.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.22 | git | 2.38.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.23 | git | 2.38.1-r0 | ALPINE-CVE-2022-39253 |
| Alpine:v3.24 | git | 2.38.1-r0 | ALPINE-CVE-2022-39253 |
| Debian:12 | git | 1:2.38.1-1 | DEBIAN-CVE-2022-39253 |
| Debian:13 | git | 1:2.38.1-1 | DEBIAN-CVE-2022-39253 |
| Debian:14 | git | 1:2.38.1-1 | DEBIAN-CVE-2022-39253 |
| Ubuntu:22.04:LTS | git | 1:2.34.1-1ubuntu1.5 | UBUNTU-CVE-2022-39253 |
| Ubuntu:22.04:LTS | git | 1:2.34.1-1ubuntu1.5 | USN-5686-1 |
Affected products (as reported)
Weakness: CWE-200 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
References
- https://github.com/git/git/security/advisories/GHSA-3wp6-j8xr-qw85
- FEDORA-2022-12790ca71a vendor-advisory
- FEDORA-2022-8b58806840 vendor-advisory
- https://support.apple.com/kb/HT213496
- FEDORA-2022-53aadd995f vendor-advisory
- 20221107 APPLE-SA-2022-11-01-1 Xcode 14.1 mailing-list
- FEDORA-2022-2c33bba286 vendor-advisory
- FEDORA-2022-fb088df94c vendor-advisory
- [debian-lts-announce] 20221213 [SECURITY] [DLA 3239-1] git security update mailing-list
- [oss-security] 20230214 [Announce] Git 2.39.2 and friends mailing-list
- GLSA-202312-15 vendor-advisory
- [oss-security] 20240514 git: 5 vulnerabilities fixed mailing-list