Bug 1267580 - (CVE-2015-5292) CVE-2015-5292 sssd: memory leak in the sssd_pac_plugin
CVE-2015-5292 sssd: memory leak in the sssd_pac_plugin
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20150923,reported=2...
: Security
Depends On: 1266404 1267176 1268783 1268807
Blocks: 1267581
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Reported: 2015-09-30 09:11 EDT by Martin Prpič
Modified: 2017-01-10 10:01 EST (History)
29 users (show)

See Also:
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.
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Last Closed: 2017-01-10 10:01:10 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Martin Prpič 2015-09-30 09:11:09 EDT
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 06:38:04 EDT
Created sssd tracking bugs for this issue:

Affects: fedora-all [bug 1268807]
Comment 6 Fedora Update System 2015-10-11 12:03:45 EDT
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 2015-10-19 21:54:39 EDT
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 2015-10-19 22:53:42 EDT
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 09:05:21 EDT
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 08:01:57 EST
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 06:40:51 EST
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

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