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Vulnerability Details CVE-2021-4034

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.883
EPSS Ranking 99.5%
CVSS Severity
CVSS v3 Score 7.8
CVSS v2 Score 7.2
Proposed Action
The Red Hat polkit pkexec utility contains an out-of-bounds read and write vulnerability that allows for privilege escalation with administrative rights.
Ransomware Campaign
Unknown
References
Products affected by CVE-2021-4034


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