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Rewterz Threat Alert – Lazarus APT Group – Active IOCs
January 27, 2022
Rewterz
Rewterz Threat Advisory – CVE-2022-22942 – Linux Kernel Vulnerabaility
January 28, 2022

Rewterz Threat Advisory – CVE-2021-4034 – PwnKit Vulnerability in Linux

Severity

High

Analysis Summary

CVE-2021-4034

A memory corruption vulnerability in a SUID-root Program (polkit’s pkexec) was recently discovered by the Qualys Research Team. It is an easily exploitable vulnerability that allows any unprivileged user to gain full root privileges on a vulnerable host by exploiting this vulnerability in its default configuration. Polkit or PolicyKit controls the system-wide privileges in all Unix-like OS. This component enables organized communication between privileged and non-privileged processes. Successful exploitation of this vulnerability allows any unprivileged user to gain root privileges on the vulnerable host.This is a decade-old flaw that affects all versions of pkexec. 

Rewterz also tested the exploit, which gave us root privileges upon running the PoC. 

advisory-1643287744.png

Root Privileges Upon running the cve-2021-4034 PoC

Impact

  • Privilege Escalation

Affected Vendors

Linux

Affected Products

  • Ubuntu
  • Debian
  • Fedora
  • CentOS

Remediation

Apply patches for this vulnerability from https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034