Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. This bug is similar to CVE-2020-5260(GHSA-qm7j-c969-7j4q). The fix for that bug still left the door open for an exploit where some credential is leaked (but the attacker cannot control which one). Git uses external credential helper programs to store and retrieve passwords or other credentials from secure storage provided by the operating system. Specially-crafted URLs that are considered illegal as of the recently published Git versions can cause Git to send a blank pattern to helpers, missing hostname and protocol fields. Many helpers will interpret this as matching any URL, and will return some unspecified stored password, leaking the password to an attackers server. The vulnerability can be triggered by feeding a malicious URL to git clone. However, the affected URLs look rather suspicious; the likely vector would be through systems which automatically clone URLs not visible to the user, such as Git submodules, or package systems built around Git. The root of the problem is in Git itself, which should not be feeding blank input to helpers. However, the ability to exploit the vulnerability in practice depends on which helpers are in use. Credential helpers which are known to trigger the vulnerability: - Gits store helper - Gits cache helper - the osxkeychain helper that ships in Gits contrib directory Credential helpers which are known to be safe even with vulnerable versions of Git: - Git Credential Manager for Windows Any helper not in this list should be assumed to trigger the vulnerability.
The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Git | Git-scm | * | 2.17.5 (excluding) |
| Git | Git-scm | 2.18.0 (including) | 2.18.4 (excluding) |
| Git | Git-scm | 2.19.0 (including) | 2.19.5 (excluding) |
| Git | Git-scm | 2.20.0 (including) | 2.20.4 (excluding) |
| Git | Git-scm | 2.21.0 (including) | 2.21.3 (excluding) |
| Git | Git-scm | 2.22.0 (including) | 2.22.4 (excluding) |
| Git | Git-scm | 2.23.0 (including) | 2.23.3 (excluding) |
| Git | Git-scm | 2.24.0 (including) | 2.24.3 (excluding) |
| Git | Git-scm | 2.25.0 (including) | 2.25.4 (excluding) |
| Git | Git-scm | 2.26.0 (including) | 2.26.2 (excluding) |