Bug 1267580 (CVE-2015-5292)

Summary:	CVE-2015-5292 sssd: memory leak in the sssd_pac_plugin
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bkearney, carnil, cpelland, dajohnso, dclarizi, gblomqui, gmccullo, grajaiya, gtanzill, jfrey, jgalipea, jhardy, jhrozek, jprause, kseifried, lslebodn, mkosek, mmccune, mprpic, mzidek, obarenbo, ohadlevy, pbrezina, roliveri, security-response-team, sgoveas, tjay, tlestach, xlecauch
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	It was found that SSSD's Privilege Attribute Certificate (PAC) responder plug-in would leak a small amount of memory on each authentication request. A remote attacker could potentially use this flaw to exhaust all available memory on the system by making repeated requests to a Kerberized daemon application configured to authenticate using the PAC responder plug-in.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-01-10 15:01:10 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:	1266404, 1267176, 1268783, 1268807
Bug Blocks:	1267581

Description Martin Prpič 2015-09-30 13:11:09 UTC

A memory leak was found in the sssd_pac_plugin (sssd_pac_plugin.so library), which is distributed with the sssd_client package.

Original report with additional details:

https://fedorahosted.org/sssd/ticket/2803

Patch:

https://fedorahosted.org/sssd/attachment/ticket/2803/0001-Fix-memory-leak-in-sssdpac_verify.patch

Comment 5 Martin Prpič 2015-10-05 10:38:04 UTC

Created sssd tracking bugs for this issue:

Affects: fedora-all [bug 1268807]

Comment 6 Fedora Update System 2015-10-11 16:03:45 UTC

sssd-1.13.1-2.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 12 Fedora Update System 2015-10-20 01:54:39 UTC

sssd-1.13.1-2.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 13 Fedora Update System 2015-10-20 02:53:42 UTC

sssd-1.12.5-4.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.

Comment 14 Martin Prpič 2015-10-20 13:05:21 UTC

Analysis:

The issue is in the PAC responder that's provided with SSSD. When an application is configured to use Kerberos and authenticate against SSSD's PAC responder, the responder leaks a small amount of memory on every authentication attempt. This could allow an attacker to eventually exhaust all available memory on the system by sending numerous auth requests to a running application (daemon) configured as stated above.

The vulnerable code is detailed in https://fedorahosted.org/sssd/ticket/2803

Comment 16 errata-xmlrpc 2015-11-10 13:01:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:2019 https://rhn.redhat.com/errata/RHSA-2015-2019.html

Comment 17 errata-xmlrpc 2015-11-19 11:40:51 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:2355 https://rhn.redhat.com/errata/RHSA-2015-2355.html