Bug 1320956

Summary:	parallel: Race condition when recreating temporary files
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	carnil, packages
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	parallel 20150522	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:50:05 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:	1320958
Bug Blocks:

Description Adam Mariš 2016-03-24 11:08:34 UTC

Race condition vulnerability lies in GNU Parallel's way of creating temporary files while at the same time trying to remove these ASAP, so if GNU Parallel is stopped, there will be no temporary files to clean up. A local attacker can exploit this issue to overwrite a file with one byte file.

If an attacker sees the temporary file being created, and then removed, he has 15 ms to create a symlink with the same name to a file owned by the user. And if the file is then being recreated this will overwrite the user's file.

GNU Parallel is vulnerable when using --pipe, --tmux, --cat, --fifo, or --compress.

This issue was partly fixed in 20150422 and fully fixed in 20150522.

External Reference:

https://lists.gnu.org/archive/html/parallel/2015-04/msg00045.html

Comment 1 Adam Mariš 2016-03-24 11:09:01 UTC

Created parallel tracking bugs for this issue:

Affects: fedora-all [bug 1320958]

Comment 2 Fedora Update System 2016-04-24 20:49:30 UTC

parallel-20160222-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2016-04-24 20:53:08 UTC

parallel-20160222-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-05-07 12:11:57 UTC

parallel-20160222-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Product Security DevOps Team 2019-06-08 02:50:05 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.