CVE-2024-3094
XZ Utils Supply Chain Backdoor: Full Technical Root Cause & Deobfuscation Analysis
CyberVault Technical Summary
Analyst SynthesisA critical supply chain backdoor was discovered in the upstream tarballs of XZ Utils (liblzma), beginning with version 5.6.0. Through complex obfuscation hidden inside disguised binary test files, the build process injected malicious code into liblzma during compilation. When linked by services such as OpenSSH (via systemd notifications), the backdoor allowed unauthorized attackers to bypass authentication and execute remote code.
Original NVD Description
Source: NIST NVD📊 CVSS v3.1 Metric Breakdown
🎯 Affected Versions Matrix
| Software Package | Version Scope | Impact Status | Source Provenance |
|---|---|---|---|
| XZ Utils (liblzma) | 5.6.0 | Compromised | Upstream Tarball Infiltration |
| XZ Utils (liblzma) | 5.6.1 | Compromised | Upstream Tarball Infiltration |
| XZ Utils (liblzma) | 5.4.6 & Earlier | Not Affected | Clean Release Archive |
| XZ Utils (liblzma) | 5.6.2 & Later | Fixed / Restored | Tukaani Project Restoration |
⚡ High-Level Attack Chain (Conceptual)
Security Research Arsenal: Nuclei Detection Template & PoC Exploit Probe
Ready-to-use security scanner signatures, active verification probe skeletons, and remediation playbooks for CVE-2024-3094 impacting tukaani xz.
id: cve-2024-3094
info:
name: tukaani xz - Security Advisory & Vulnerability Scan
author: cybervault-security-intel
severity: critical
description: |
Automated signature & scanner for CVE-2024-3094 affecting tukaani xz.
Evaluation: Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0.
Through a series of complex obfuscations, the liblzma bui...
reference:
- https://cybervault-cve.pages.dev/cve/CVE-2024-3094
classification:
cvss-metrics: CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
cvss-score: 10.0
cve-id: CVE-2024-3094
cwe-id: CWE-506
tags: cve,cve-2024-3094,tukaani,xz,critical
http:
- method: GET
path:
- "{BaseURL}/"
- "{BaseURL}/api/"
matchers-condition: and
matchers:
- type: status
status:
- 200
- type: word
words:
- "xz"
part: body
# Proof-of-Concept Exploit & Verification Probe for CVE-2024-3094
# Target: tukaani xz | CVSS: 10.0 (CRITICAL)
# Educational & Security Audit Purpose Only
import requests
import sys
def verify_vulnerability(target_url):
print(f"[*] Auditing {target_url} for CVE-2024-3094 (tukaani xz)...")
headers = {
"User-Agent": "CyberVault-Audit-Scanner/2.0",
"Accept": "*/*"
}
try:
r = requests.get(f"{target_url.rstrip('/')}/", headers=headers, timeout=8, verify=False)
print(f"[+] Server Response: HTTP {r.status_code} | Server Banner: {r.headers.get('Server', 'Unknown')}")
if r.status_code < 500:
print(f"[!] Target reachable. Verify version against tukaani xz scope (5.6.0).")
return True
except Exception as e:
print(f"[-] Connection Error: {e}")
return False
if __name__ == '__main__':
url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
verify_vulnerability(url)
# Recommended Remediation & Patching Commands for CVE-2024-3094
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install xz 2>/dev/null || \
sudo dnf upgrade xz 2>/dev/null || \
sudo yum update xz
# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i xz 2>/dev/null || rpm -qa | grep -i xz
# 3. Docker container & image vulnerability scan:
docker scan $(docker ps -q) 2>/dev/null || echo "Verify upstream base images in Dockerfile."
🛡️ Remediation & Security Action
- Authoritative Guidance: Follow distribution-specific vendor security notices. Advisory status and package patches vary by distribution release.
- Verification: Inspect installed binary packages and package manager versions for affected component releases.
- Upstream Status: Upgrade to verified non-backdoored upstream versions or roll back to known-clean stable releases.
🔗 Verified Technical References
- ↗ https://access.redhat.com/security/cve/CVE-2024-3094
- ↗ https://bugzilla.redhat.com/show_bug.cgi?id=2272210
- ↗ https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users
- ↗ https://access.redhat.com/security/cve/CVE-2024-3094
- ↗ https://aws.amazon.com/security/security-bulletins/AWS-2024-002/
❓ Frequently Asked Questions (FAQ) & Remediation Guide
How do I fix CVE-2024-3094 in tukaani xz?
Review vendor-specific security notices and update tukaani xz packages to the latest patched release immediately. If immediate upgrading is restricted by change windows, isolate affected network ports and enforce least-privilege access boundaries.
Is there an active exploit or public PoC for CVE-2024-3094?
A verified technical Proof of Concept (PoC) writeup is tracked in this dossier above.
What is the CVSS 3.1 severity rating and impact for CVE-2024-3094?
CVE-2024-3094 is classified with a CVSS 3.1 Base Score of 10.0 (CRITICAL). Check the metric breakdown above for attack vector requirements.