Description
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.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2024-3094 ↗
- access.redhat.com/security/cve/CVE-2024-3094 ↗
- bugzilla.redhat.com/show_bug.cgi ↗
- www.openwall.com/lists/oss-security/2024/03/29/4 ↗
- www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users ↗
- www.openwall.com/lists/oss-security/2024/03/29/10 ↗
- www.openwall.com/lists/oss-security/2024/03/29/12 ↗
- www.openwall.com/lists/oss-security/2024/03/29/4 ↗
- www.openwall.com/lists/oss-security/2024/03/29/5 ↗
- www.openwall.com/lists/oss-security/2024/03/29/8 ↗
- www.openwall.com/lists/oss-security/2024/03/30/12 ↗
- www.openwall.com/lists/oss-security/2024/03/30/27 ↗
- www.openwall.com/lists/oss-security/2024/03/30/36 ↗
- www.openwall.com/lists/oss-security/2024/03/30/5 ↗
- www.openwall.com/lists/oss-security/2024/04/16/5 ↗
- ariadne.space/2024/04/02/the-xz-utils-backdoor-is-a-symptom-of-a-larger-problem/ ↗
- arstechnica.com/security/2024/03/backdoor-found-in-widely-used-linux-utility-breaks-encrypted-ssh-connections/ ↗
- aws.amazon.com/security/security-bulletins/AWS-2024-002/ ↗
- blog.netbsd.org/tnf/entry/statement_on_backdoor_in_xz ↗
- boehs.org/node/everything-i-know-about-the-xz-backdoor ↗
- bugs.debian.org/cgi-bin/bugreport.cgi ↗
- bugs.gentoo.org/928134 ↗
- bugzilla.suse.com/show_bug.cgi ↗
- discourse.nixos.org/t/cve-2024-3094-malicious-code-in-xz-5-6-0-and-5-6-1-tarballs/42405 ↗
- gist.github.com/thesamesam/223949d5a074ebc3dce9ee78baad9e27 ↗
- github.com/advisories/GHSA-rxwq-x6h5-x525 ↗
- github.com/amlweems/xzbot ↗
- github.com/karcherm/xz-malware ↗
- gynvael.coldwind.pl/ ↗
- lists.debian.org/debian-security-announce/2024/msg00057.html ↗
- lists.freebsd.org/archives/freebsd-security/2024-March/000248.html ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.