Memory leak in Pagure SSSD

1) Memory leak

EUVDB-ID: #VU40622

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-5292

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the Privilege Attribute Certificate (PAC) responder plugin (sssd_pac_plugin.so) in System Security Services Daemon (SSSD) 1.10 before 1.13.1 allows remote authenticated users to cause a denial of service (memory consumption) via a large number of logins that trigger parsing of PAC blobs during Kerberos authentication. A remote attacker can perform a denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SSSD: 1.10.0 - 1.13.0

CPE2.3

• cpe:2.3:a:SSSD:sssd:1.10.0:*:*:*:*:*:*:*
• cpe:2.3:a:SSSD:sssd:1.10.1:*:*:*:*:*:*:*
• cpe:2.3:a:SSSD:sssd:1.11.0:*:*:*:*:*:*:*

External links

https://lists.fedoraproject.org/pipermail/package-announce/2015-October/169110.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-October/169597.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-October/169613.html
https://permalink.gmane.org/gmane.linux.redhat.sssd.user/3422
https://rhn.redhat.com/errata/RHSA-2015-2019.html
https://rhn.redhat.com/errata/RHSA-2015-2355.html
https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
https://www.securityfocus.com/bid/77529
https://www.securitytracker.com/id/1034038
https://bugzilla.redhat.com/show_bug.cgi?id=1267580
https://fedorahosted.org/sssd/attachment/ticket/2803/0001-Fix-memory-leak-in-sssdpac_verify.patch
https://fedorahosted.org/sssd/ticket/2803
https://fedorahosted.org/sssd/wiki/Releases/Notes-1.13.1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.