Skip to content

git2-rs fails to verify SSH keys by default

Moderate severity GitHub Reviewed Published Jan 20, 2023 in rust-lang/git2-rs • Updated Jan 23, 2023

Package

cargo git2 (Rust)

Affected versions

< 0.16.1

Patched versions

0.16.1
cargo libgit2-sys (Rust)
>= 0.14.0, < 0.14.2
< 0.13.5
0.14.2
0.13.5

Description

The git2 and libgit2-sys crates are Rust wrappers around the libgit2 C library. It was discovered that libgit2 1.5.0 and below did not verify SSH host keys when establishing an SSH connection, exposing users of the library to Man-In-the-Middle attacks.

The libgit2 team assigned CVE-2023-22742 to this vulnerability. The following versions of the libgit2-sys Rust crate have been released:

  • libgit2-sys 0.14.2, updating the underlying libgit2 C library to version 1.5.1.
  • libgit2-sys 0.13.5, updating the underlying libgit2 C library to version 1.4.5.

A new git2 crate version has also been released, 0.16.1. This version only bumps its libgit2-sys dependency to ensure no vulnerable libgit2-sys versions are used, but contains no code changes: if you update the libgit2-sys version there is no need to also update the git2 crate version.

You can learn more about this vulnerability in libgit2's advisory

References

@pietroalbini pietroalbini published to rust-lang/git2-rs Jan 20, 2023
Published to the GitHub Advisory Database Jan 20, 2023
Reviewed Jan 20, 2023
Last updated Jan 23, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS score

Weaknesses

No CWEs

CVE ID

No known CVE

GHSA ID

GHSA-m4ch-rfv5-x5g3

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.