Bug 1095855 (CVE-2014-3215)

Summary:	CVE-2014-3215 policycoreutils: local privilege escalation via seunshare
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, aquini, carnil, dhoward, dwalsh, eparis, fhrbata, jkurik, kernel-mgr, lvrabec, lwang, mgrepl, mmalik, nobody, npajkovs, plautrba, pmatouse, pmoore, pvrabec, sgrubb, ssekidde, vkrizan
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way seunshare, a utility for running executables under a different security context, used the capng_lock functionality of the libcap-ng library. The subsequent invocation of suid root binaries that relied on the fact that the setuid() system call, among others, also sets the saved set-user-ID when dropping the binaries' process privileges, could allow a local, unprivileged user to potentially escalate their privileges on the system. Note: the fix for this issue is the kernel part of the overall fix, and introduces the PR_SET_NO_NEW_PRIVS functionality and the related SELinux exec transitions support.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-06-29 09:25:00 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:	1104546, 1104547, 1104548, 1104549, 1104551, 1104552, 1104567, 1104568
Bug Blocks:	1095856

Description Vincent Danen 2014-05-08 16:39:41 UTC

Common Vulnerabilities and Exposures assigned an identifier CVE-2014-3215 to
the following vulnerability:

Name: CVE-2014-3215
URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3215
Assigned: 20140503
Reference: http://openwall.com/lists/oss-security/2014/04/29/7
Reference: http://openwall.com/lists/oss-security/2014/04/30/4
Reference: http://openwall.com/lists/oss-security/2014/05/08/1

seunshare in policycoreutils 2.2.5 is owned by root with 4755
permissions, and executes programs in a way that changes the
relationship between the setuid system call and the getresuid saved
set-user-ID value, which makes it easier for local users to gain
privileges by leveraging a program that mistakenly expected that it
could permanently drop privileges.


Note this was originally reported by Andy Lutomirski in bug #885288 (also see bug #1035427 (and its attached patch, which is for libcap-ng)).

Comment 16 Petr Matousek 2015-04-21 11:57:24 UTC

Acknowledgements:

Red Hat would like to thank Andy Lutomirski for reporting this issue.

Comment 17 Petr Matousek 2015-04-21 12:48:22 UTC

Upstream patches for the kernel part:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=259e5e6c75a910f3b5e656151dc602f53f9d7548
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7b0d0b40cd78cadb525df760ee4cac151533c2b5

Comment 18 errata-xmlrpc 2015-04-21 15:01:14 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:0864 https://rhn.redhat.com/errata/RHSA-2015-0864.html