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.
Package Versions Affected
Automatically patch vulnerabilities without upgrading
CVSS Version
Related Resources
References
https://access.redhat.com/security/vulnerabilities/RHSB-2022-001, https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt, https://www.cisa.gov/known-exploited-vulnerabilities-catalog?fieldcve=CVE-2021-4034, http://packetstormsecurity.com/files/166196/Polkit-pkexec-Local-Privilege-Escalation.html, http://packetstormsecurity.com/files/166200/Polkit-pkexec-Privilege-Escalation.html, https://cert-portal.siemens.com/productcert/pdf/ssa-330556.pdf, https://www.oracle.com/security-alerts/cpuapr2022.html, https://www.secpod.com/blog/local-privilege-escalation-vulnerability-in-major-linux-distributions-cve-2021-4034/, https://www.starwindsoftware.com/security/sw-20220818-0001/, https://www.suse.com/support/kb/doc/?id=000020564, https://www.vicarius.io/vsociety/posts/pwnkit-pkexec-lpe-cve-2021-4034, https://bugzilla.redhat.com/showbug.cgi?id=2025869, https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683
Basic Information
