CVE-2021-4034

Known Exploited Vulnerability

Red Hat Polkit Out-of-Bounds Read and Write Vulnerability

Vendor / product: Red Hat / Polkit

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.

Weakness classification

• secalert@redhat.com: CWE-787
• nvd@nist.gov: CWE-125

Primary references

• secalert@redhat.com — Exploit, Third Party Advisory, VDB Entry
• secalert@redhat.com — Third Party Advisory, VDB Entry
• secalert@redhat.com — Mitigation, Vendor Advisory
• secalert@redhat.com — Issue Tracking, Patch
• secalert@redhat.com — Third Party Advisory
• secalert@redhat.com — Patch
• secalert@redhat.com — Patch, Third Party Advisory
• secalert@redhat.com — Exploit, Mitigation, Third Party Advisory
• secalert@redhat.com — Exploit, Third Party Advisory
• secalert@redhat.com — Third Party Advisory
• secalert@redhat.com — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory, VDB Entry