CVE-2017-7572

NameCVE-2017-7572
DescriptionThe _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/status, by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severityhigh
Debian Bugs859815

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
backintime (PTS)jessie1.0.36-1+deb8u1vulnerable
stretch1.1.12-2fixed
buster1.1.24-0.1fixed
bullseye, sid1.2.1-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
backintimesource(unstable)1.1.12-2859815
backintimesourcewheezy(not affected)

Notes

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

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