Bug 892715 (CVE-2012-6095)

Summary:	CVE-2012-6095 proftpd: Symlink race condition when applying UserOwner to a newly (ProFTPD) created directory
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	matthias, paul
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-08-19 09:39:17 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:	892718, 892719
Bug Blocks:

Description Jan Lieskovsky 2013-01-07 16:47:28 UTC

A time-of-check time-of-use (TOCTOU) race condition flaw was found in the way ProFTPD, flexible, stable and highly-configurable FTP server, handled MKD/XMKD FTP commands when the UserOwner directive was involved. A local attacker could use this flaw to possibly escalate their privileges via symbolic-link attacks on directories, created by ProFTPD prior UserOwner ownership was applied.

Upstream bug report:
[1] http://bugs.proftpd.org/show_bug.cgi?id=3841

Relevant upstream patch:
[2] http://bugs.proftpd.org/show_bug.cgi?id=3841#c8

References:
[3] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=697524

Comment 1 Jan Lieskovsky 2013-01-07 16:50:38 UTC

This issue affects the versions of the proftpd package, as shipped with Fedora release of 16 and 17. Please schedule an update.

--

This issue affects the versions of the proftpd package, as shipped with Fedora EPEL 5 and 6. Please schedule an update.

Comment 2 Jan Lieskovsky 2013-01-07 16:51:58 UTC

Created proftpd tracking bugs for this issue

Affects: fedora-all [bug 892718]
Affects: epel-all [bug 892719]

Comment 3 Jan Lieskovsky 2013-01-08 11:30:37 UTC

The CVE identifier of CVE-2012-6095 has been assigned to this issue:
  http://www.openwall.com/lists/oss-security/2013/01/07/3

Comment 4 Fedora Update System 2013-01-30 00:31:11 UTC

proftpd-1.3.4b-5.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2013-01-30 00:31:39 UTC

proftpd-1.3.4b-5.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2013-01-30 00:58:54 UTC

proftpd-1.3.4b-5.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2013-02-05 21:22:37 UTC

proftpd-1.3.3g-2.el5 has been pushed to the Fedora EPEL 5 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2013-02-05 21:25:28 UTC

proftpd-1.3.3g-2.el6 has been pushed to the Fedora EPEL 6 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Paul Howarth 2013-08-19 09:19:19 UTC

This has been addressed in all current Fedora and EPEL releases. Can we close the bug now?

Comment 10 Tomas Hoger 2013-08-19 09:39:17 UTC

Yes, thank you!