Bug 1441584 (CVE-2017-7572)

Summary:	CVE-2017-7572 backintime: Race condition in the checkPolkitPrivilege function
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED RAWHIDE	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	i, johannes.lips, projects.rg
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	backintime 1.1.20	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-05-06 07:23:48 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1441585
Bug Blocks:

Description Andrej Nemec 2017-04-12 09:17:43 UTC

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/status, by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester. 

Upstream patch:

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

References:

https://github.com/bit-team/backintime/releases/tag/v1.1.20

Comment 1 Andrej Nemec 2017-04-12 09:18:14 UTC

Created backintime tracking bugs for this issue:

Affects: fedora-all [bug 1441585]

Comment 2 Raphael Groner 2018-04-06 19:55:45 UTC

Bug 1441585 is closed, so can we close here as well?