CVE-2017-7572

Name	CVE-2017-7572
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/status, by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	859815

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
backintime (PTS)	buster	1.1.24-0.1	fixed
	bullseye	1.2.1-3	fixed
	bookworm	1.3.3-4	fixed
	sid, trixie	1.4.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
backintime	source	wheezy	(not affected)
backintime	source	(unstable)	1.1.12-2			859815

Notes

[jessie] - backintime <no-dsa> (Minor issue)
[wheezy] - backintime <not-affected> (Vulnerable code not present)
https://www.openwall.com/lists/oss-security/2017/04/07/2
https://github.com/bit-team/backintime/commit/7f208dc547f569b689c888103e3b593a48cd1869