Race Condition Vulnerability in Back In Time's _checkPolkitPrivilege Function

CVE-2017-7572 · HIGH Severity

AV:N/AC:M/AU:N/C:C/I:C/A:C

The _checkPolkitPrivilege function in serviceHelper.py in Back In Time (aka backintime) 1.1.18 and earlier uses a deprecated polkit authorization method (unix-process) that is subject to a race condition (time of check, time of use). With this authorization method, the owner of a process requesting a polkit operation is checked by polkitd via /proc/<pid>/status, by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester.

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