Bug 1028148 (CVE-2013-2929)

Summary:	CVE-2013-2929 kernel: exec/ptrace: get_dumpable() incorrect tests
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, esammons, fhrbata, iboverma, jkacur, jkurik, jross, kernel-mgr, lgoncalv, lwang, mcressma, nobody, onestero, pholasek, plougher, rvrbovsk, security-response-team, williams
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 the get_dumpable() function return value was interpreted in the ptrace subsystem of the Linux kernel. When 'fs.suid_dumpable' was set to 2, a local, unprivileged local user could use this flaw to bypass intended ptrace restrictions and obtain potentially sensitive information.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-10-15 21:12:24 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:	1039483, 1039484, 1039486, 1039487, 1039488, 1039489, 1111605, 1111606, 1547159, 1547160
Bug Blocks:	1028151

Description Petr Matousek 2013-11-07 18:52:23 UTC

The get_dumpable() return value is not boolean.  Most users of the function actually want to be testing for non-SUID_DUMP_USER(1) rather than SUID_DUMP_DISABLE(0).  The SUID_DUMP_ROOT(2) is also considered a protected state. 

If the system had set the sysctl fs.suid_dumpable=2, a user was able to ptrace attach to processes that he would otherwise be unable to because of the dumpable check.

Upstream fix:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d049f74f2dbe71354d43d393ac3a188947811348

Comment 4 errata-xmlrpc 2014-01-28 17:40:57 UTC

This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:0100 https://rhn.redhat.com/errata/RHSA-2014-0100.html

Comment 5 errata-xmlrpc 2014-02-11 18:16:14 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:0159 https://rhn.redhat.com/errata/RHSA-2014-0159.html

Comment 6 errata-xmlrpc 2014-03-12 18:29:23 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:0285 https://rhn.redhat.com/errata/RHSA-2014-0285.html

Comment 8 Martin Prpič 2014-12-03 09:20:23 UTC

IssueDescription:

A flaw was found in the way the get_dumpable() function return value was interpreted in the ptrace subsystem of the Linux kernel. When 'fs.suid_dumpable' was set to 2, a local, unprivileged local user could use this flaw to bypass intended ptrace restrictions and obtain potentially sensitive information.

Comment 9 errata-xmlrpc 2014-12-09 20:33:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:1971 https://rhn.redhat.com/errata/RHSA-2014-1971.html

Comment 10 Vincent Danen 2015-10-15 21:12:24 UTC

Statement:

(none)

Comment 12 errata-xmlrpc 2018-04-25 20:36:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5.9 Long Life

Via RHSA-2018:1252 https://access.redhat.com/errata/RHSA-2018:1252