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CVE-2017-7572

Published: 6 April 2017

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/status, by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester.

Priority

Low

Cvss 3 Severity Score

8.1

Score breakdown

Status

Package Release Status
backintime
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Not vulnerable
(1.1.12-2)
cosmic Not vulnerable
(1.1.12-2)
disco Not vulnerable
(1.1.12-2)
xenial
Released (1.1.2-2~build0.16.04.1)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)
precise Ignored
(end of life)
trusty Does not exist
(trusty was needed)
upstream
Released (1.1.12-2)
Patches:
upstream: https://github.com/bit-team/backintime/commit/7f208dc547f569b689c888103e3b593a48cd1869

Severity score breakdown

Parameter Value
Base score 8.1
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H