CVE-2023-22742

Published: 20 January 2023

libgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Prior versions of libgit2 require the caller to set the `certificate_check` field of libgit2's `git_remote_callbacks` structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack. Users are encouraged to upgrade to v1.4.5 or v1.5.1. Users unable to upgrade should ensure that all relevant certificates are manually checked.

Priority

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package	Release	Status
libgit2 Launchpad, Ubuntu, Debian	bionic	Released (0.26.0+dfsg.1-1.1ubuntu0.2+esm1) Available with Ubuntu Pro
	focal	Released (0.28.4+dfsg.1-2ubuntu0.1)
	jammy	Released (1.1.0+dfsg.1-4.1ubuntu0.1)
	kinetic	Ignored (end of life, was needs-triage)
	lunar	Not vulnerable (1.5.1+ds-1ubuntu1)
	mantic	Not vulnerable (1.5.1+ds-1ubuntu1)
	noble	Not vulnerable (1.5.1+ds-1ubuntu1)
	trusty	Needed
	upstream	Released (1.4.5,1.5.1+ds-1)
	xenial	Released (0.24.1-2ubuntu0.2+esm2) Available with Ubuntu Pro
	Patches: upstream: https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58ea upstream: https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56

Severity score breakdown

Parameter	Value
Base score	5.9
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1029368

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