Bug 746713 (CVE-2011-3632)

Summary:	CVE-2011-3632 hardlink: Prone to symlink attacks
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:58:07 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:	746715
Bug Blocks:	746750

Description Jan Lieskovsky 2011-10-17 15:38:18 UTC

It was reported, that hardlink, the tool for consolidation of duplicate files via hardlinks operated on full file system objects path names. A local attacker could use this flaw to conduct symlink attacks (cause the hardlink executable to operate on directories / files outside of the intended directory tree).

References:
[1] http://www.openwall.com/lists/oss-security/2011/10/15/2
[2] https://bugs.gentoo.org/show_bug.cgi?id=387269
[3] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=645516

Proposed patch (applied by the Owl Linux distribution):
[Adds section BUGS into the hardlink(1) man page documenting the danger]
[4] http://cvsweb.openwall.com/cgi/cvsweb.cgi/Owl/packages/hardlink/hardlink.1.diff?r1=1.1;r2=1.2

Comment 1 Jan Lieskovsky 2011-10-17 15:40:12 UTC

This issue affect the versions of the hardlink package, as shipped with Fedora release of 14 and 15. Please schedule an update.

Comment 2 Jan Lieskovsky 2011-10-17 15:42:19 UTC

Created hardlink tracking bugs for this issue

Affects: fedora-all [bug 746715]

Comment 3 Jan Lieskovsky 2011-10-17 16:50:40 UTC

This issue affect the versions of the hardlink package, as shipped with
Red Hat Enterprise Linux 5 and 6.

Comment 4 Jan Lieskovsky 2011-10-20 15:48:00 UTC

The CVE identifier of CVE-2011-3632 has been assigned to this issue:
[5] http://www.openwall.com/lists/oss-security/2011/10/20/6

Comment 7 Fedora Update System 2011-11-23 23:27:54 UTC

hardlink-1.0-12.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2011-12-11 21:50:09 UTC

hardlink-1.0-12.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.