The Qualys Research Labs discovered a local privilege escalation in PolicyKit’s pkexec.
Details can be found in the Qualys advisory at https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt
For Debian 8 jessie, these problems have been fixed in version 0.105-15~deb8u5.
We recommend that you upgrade your policykit-1 packages.
Further information about Extended LTS security advisories can be found in the dedicated section of our website.