CVE Catalog

CVE-2024-3094

CriticalCVSS 10.0
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Very high risk
90.90%

100th percentile - higher than 100% of all known CVEs

Summary

Malicious code was discovered in the upstream tarballs of xz starting with version 5.6.0. The liblzma build process extracts a prebuilt object file from a disguised test file and modifies specific functions in the liblzma code, resulting in a modified library that can intercept and modify data interaction with any software linked against it.

Risk Assessment

The vulnerability allows an attacker to inject a backdoor into the authentication process of systems using the compromised library, potentially leading to full system compromise. The risk is critical for organizations using vulnerable xz/liblzma versions.

Recommendation

Immediately identify and roll back xz/liblzma versions 5.6.0–5.6.1 and restore earlier trusted versions. Also audit systems for unusual sshd behavior and verify package integrity.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS