CVE-2017-7572 Information

Description

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requesting a polkit operation is checked by polkitd via /proc/pid/status by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://github.com/bit-team/backintime/commit/7f208dc547f569b689c888103e3b593a48cd1869

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1