Scientific Linux Security Update : sssd on SL6.x i386/x86_64

This script is Copyright (C) 2015 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

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. (CVE-2015-5292)

This update also fixes the following bugs :

- Previously, SSSD did not correctly handle sudo rules
that applied to groups with names containing special
characters, such as the '(' opening parenthesis sign.
Consequently, SSSD skipped such sudo rules. The internal
sysdb search has been modified to escape special
characters when searching for objects to which sudo
rules apply. As a result, SSSD applies the described
sudo rules as expected.

- Prior to this update, SSSD did not correctly handle
group names containing special Lightweight Directory
Access Protocol (LDAP) characters, such as the '(' or
')' parenthesis signs. When a group name contained one
or more such characters, the internal cache cleanup
operation failed with an I/O error. With this update,
LDAP special characters in the Distinguished Name (DN)
of a cache entry are escaped before the cleanup
operation starts. As a result, the cleanup operation
completes successfully in the described situation.

- Applications performing Kerberos authentication
previously increased the memory footprint of the
Kerberos plug-in that parses the Privilege Attribute
Certificate (PAC) information. The plug-in has been
updated to free the memory it allocates, thus fixing
this bug.

- Previously, when malformed POSIX attributes were defined
in an Active Directory (AD) LDAP server, SSSD
unexpectedly switched to offline mode. This update
relaxes certain checks for AD POSIX attribute validity.
As a result, SSSD now works as expected even when
malformed POSIX attributes are present in AD and no
longer enters offline mode in the described situation.

After installing the update, the sssd service will be restarted
automatically. Additionally, all running applications using the PAC
responder plug-in must be restarted for the changes to take effect.

See also :

http://www.nessus.org/u?50a9ba9c

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 86846 ()

Bugtraq ID:

CVE ID: CVE-2015-5292

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