USN-6678-1: libgit2 vulnerabilities

Releases

• Ubuntu 23.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• libgit2 - Portable C implementation of the Git core methods library

Details

It was discovered that libgit2 mishandled equivalent filenames on NTFS
partitions. If a user or automated system were tricked into cloning a
specially crafted repository, an attacker could possibly use this issue to
execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and
Ubuntu 18.04 LTS. (CVE-2020-12278, CVE-2020-12279)

It was discovered that libgit2 did not perform certificate checking by
default. An attacker could possibly use this issue to perform a
machine-in-the-middle attack. This issue only affected Ubuntu 16.04 LTS,
Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. (CVE-2023-22742)

It was discovered that libgit2 could be made to run into an infinite loop.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 23.10. (CVE-2024-24575)

It was discovered that libgit2 did not properly manage memory. An attacker
could possibly use this issue to cause a denial of service or execute
arbitrary code. (CVE-2024-24577)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 23.10

• libgit2-1.5 - 1.5.1+ds-1ubuntu1.1

Ubuntu 22.04

• libgit2-1.1 - 1.1.0+dfsg.1-4.1ubuntu0.1

Ubuntu 20.04

• libgit2-28 - 0.28.4+dfsg.1-2ubuntu0.1

Ubuntu 18.04

• libgit2-26 - 0.26.0+dfsg.1-1.1ubuntu0.2+esm1
  Available with Ubuntu Pro

Ubuntu 16.04

• libgit2-24 - 0.24.1-2ubuntu0.2+esm2
  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

• CVE-2024-24575
• CVE-2024-24577
• CVE-2020-12278
• CVE-2023-22742
• CVE-2020-12279