PRIOn knowledge basePRION:CVE-2021-4034Privilege escalation
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.
References
packetstormsecurity.com/files/166196/Polkit-pkexec-Local-Privilege-Escalation.html
packetstormsecurity.com/files/166200/Polkit-pkexec-Privilege-Escalation.html
access.redhat.com/security/vulnerabilities/RHSB-2022-001
bugzilla.redhat.com/show_bug.cgi?id=2025869
cert-portal.siemens.com/productcert/pdf/ssa-330556.pdf
gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683
www.oracle.com/security-alerts/cpuapr2022.html
www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt
www.secpod.com/blog/local-privilege-escalation-vulnerability-in-major-linux-distributions-cve-2021-4034/
www.starwindsoftware.com/security/sw-20220818-0001/
www.suse.com/support/kb/doc/?id=000020564
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