XZ Utils Backdoor — Tukaani Xz Vulnerability
CVE-2024-3094
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.909 (99.8th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.860 · newest: 0.909 · change: +0.049
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/security/cve/CVE-2024-3094 (vdb-entry, Vendor Advisory)
- RHBZ#2272210 (issue-tracking, Issue Tracking, Vendor Advisory)
- www.openwall.com/lists/oss-security/2024/03/29/4 (Mailing List)
- www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2024-3094?
- CVE-2024-3094 is a critical-severity vulnerability in Tukaani Xz, classified under CWE-506. CVSS score: 10.0/10. Published 2024-03-29.
- How severe is CVE-2024-3094?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2024-3094 known to be exploited?
- 214 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.