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.

Weaknesses 1

Affected Products 2

References 55

• openwall.com http://www.openwall.com/lists/oss-security/2024/03/29/10
• openwall.com http://www.openwall.com/lists/oss-security/2024/03/29/12
• openwall.com http://www.openwall.com/lists/oss-security/2024/03/29/4
• openwall.com http://www.openwall.com/lists/oss-security/2024/03/29/5
• openwall.com http://www.openwall.com/lists/oss-security/2024/03/29/8
• openwall.com http://www.openwall.com/lists/oss-security/2024/03/30/12
• openwall.com http://www.openwall.com/lists/oss-security/2024/03/30/27
• openwall.com http://www.openwall.com/lists/oss-security/2024/03/30/36
• openwall.com http://www.openwall.com/lists/oss-security/2024/03/30/5
• openwall.com http://www.openwall.com/lists/oss-security/2024/04/16/5
• access.redhat.com https://access.redhat.com/security/cve/CVE-2024-3094
  Vendor Advisory
• ariadne.space https://ariadne.space/2024/04/02/the-xz-utils-backdoor-is-a-symptom-of-a-larger-problem/
• arstechnica.com https://arstechnica.com/security/2024/03/backdoor-found-in-widely-used-linux-utility-breaks-encrypted-ssh-connections/
  Third Party Advisory
• aws.amazon.com https://aws.amazon.com/security/security-bulletins/AWS-2024-002/
  Third Party Advisory
• blog.netbsd.org https://blog.netbsd.org/tnf/entry/statement_on_backdoor_in_xz
• boehs.org https://boehs.org/node/everything-i-know-about-the-xz-backdoor
  Third Party Advisory
• bugs.debian.org https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1068024
  Mailing ListVendor Advisory
• bugs.gentoo.org https://bugs.gentoo.org/928134
  Issue TrackingThird Party Advisory
• bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2272210
  Issue TrackingVendor Advisory
• bugzilla.suse.com https://bugzilla.suse.com/show_bug.cgi?id=1222124
  Issue TrackingThird Party Advisory
• discourse.nixos.org https://discourse.nixos.org/t/cve-2024-3094-malicious-code-in-xz-5-6-0-and-5-6-1-tarballs/42405
  Third Party Advisory
• gist.github.com https://gist.github.com/thesamesam/223949d5a074ebc3dce9ee78baad9e27
  Third Party Advisory
• github.com https://github.com/advisories/GHSA-rxwq-x6h5-x525
  Third Party Advisory
• github.com https://github.com/amlweems/xzbot
• github.com https://github.com/karcherm/xz-malware
  Third Party Advisory
• gynvael.coldwind.pl https://gynvael.coldwind.pl/?lang=en&id=782
  Technical DescriptionThird Party Advisory
• lists.debian.org https://lists.debian.org/debian-security-announce/2024/msg00057.html
  Mailing ListThird Party Advisory
• lists.freebsd.org https://lists.freebsd.org/archives/freebsd-security/2024-March/000248.html
  Third Party Advisory
• lwn.net https://lwn.net/Articles/967180/
  Issue TrackingThird Party Advisory
• news.ycombinator.com https://news.ycombinator.com/item?id=39865810
  Issue TrackingThird Party Advisory
• news.ycombinator.com https://news.ycombinator.com/item?id=39877267
  Issue Tracking
• news.ycombinator.com https://news.ycombinator.com/item?id=39895344
• openssf.org https://openssf.org/blog/2024/03/30/xz-backdoor-cve-2024-3094/
  Third Party Advisory
• research.swtch.com https://research.swtch.com/xz-script
• research.swtch.com https://research.swtch.com/xz-timeline
• security-tracker.debian.org https://security-tracker.debian.org/tracker/CVE-2024-3094
  Third Party Advisory
• security.alpinelinux.org https://security.alpinelinux.org/vuln/CVE-2024-3094
  Third Party Advisory
• security.archlinux.org https://security.archlinux.org/CVE-2024-3094
  Third Party Advisory
• security.netapp.com https://security.netapp.com/advisory/ntap-20240402-0001/
• tukaani.org https://tukaani.org/xz-backdoor/
  Issue TrackingVendor Advisory
• twitter.com https://twitter.com/LetsDefendIO/status/1774804387417751958
  Third Party Advisory
• twitter.com https://twitter.com/debian/status/1774219194638409898
  Press/Media Coverage
• twitter.com https://twitter.com/infosecb/status/1774595540233167206
  Press/Media Coverage
• twitter.com https://twitter.com/infosecb/status/1774597228864139400
  Press/Media Coverage
• ubuntu.com https://ubuntu.com/security/CVE-2024-3094
  Third Party Advisory
• binarly.io https://www.binarly.io/blog/persistent-risk-xz-utils-backdoor-still-lurking-in-docker-images
• cisa.gov https://www.cisa.gov/news-events/alerts/2024/03/29/reported-supply-chain-compromise-affecting-xz-utils-data-compression-library-cve-2024-3094
  Third Party AdvisoryUS Government Resource
• darkreading.com https://www.darkreading.com/vulnerabilities-threats/are-you-affected-by-the-backdoor-in-xz-utils
  Third Party Advisory
• kali.org https://www.kali.org/blog/about-the-xz-backdoor/
• openwall.com https://www.openwall.com/lists/oss-security/2024/03/29/4
  Mailing List
• redhat.com https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users
  Vendor Advisory
• tenable.com https://www.tenable.com/blog/frequently-asked-questions-cve-2024-3094-supply-chain-backdoor-in-xz-utils
  Third Party Advisory
• theregister.com https://www.theregister.com/2024/03/29/malicious_backdoor_xz/
  Press/Media Coverage
• vicarius.io https://www.vicarius.io/vsociety/vulnerabilities/cve-2024-3094
• xeiaso.net https://xeiaso.net/notes/2024/xz-vuln/
  Third Party Advisory

Remediation