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CVE-2024-3094

Publication date 29 March 2024

Last updated 24 July 2024


Ubuntu priority

Cvss 3 Severity Score

10.0 · Critical

Score breakdown

Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0. Through a series of complex obfuscations, the liblzma build process extracts a prebuilt object file from a disguised test file existing in the source code, which is then used to modify specific functions in the liblzma code. This results in a modified liblzma library that can be used by any software linked against this library, intercepting and modifying the data interaction with this library.

Read the notes from the security team

Why is this CVE critical priority?

Results in a backdoor in sshd

Learn more about Ubuntu priority

Status

Package Ubuntu Release Status
xz-utils 24.04 LTS noble
Not affected
23.10 mantic
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes


mdeslaur

The affected version of xz-utils was only in noble-proposed, and was removed before migrating to noble itself. No released versions of Ubuntu were affected by this issue.

Severity score breakdown

Parameter Value
Base score 10.0 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H