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CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability

High · CVSS 7.8 (CVSS 3.1)KEV known exploitedEPSS 94.9%, 100th percentilePublished Updated Assigner: redhat

In CISA’s Known Exploited Vulnerabilities catalog: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability.

Added , federal remediation due . Known ransomware use: Known.

Required action: Apply updates per vendor instructions.

Description

A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.

Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H · CWE-787

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

polkit

References

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