Vulnerability CVE-2013-4122
Published: 2013-10-26   Modified: 2013-10-27

Description:
Cyrus SASL 2.1.23, 2.1.26, and earlier does not properly handle when a NULL value is returned upon an error by the crypt function as implemented in glibc 2.17 and later, which allows remote attackers to cause a denial of service (thread crash and consumption) via (1) an invalid salt or, when FIPS-140 is enabled, a (2) DES or (3) MD5 encrypted password, which triggers a NULL pointer dereference.

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
CMU -> Cyrus-sasl 

 References:
http://git.cyrusimap.org/cyrus-sasl/commit/?id=dedad73e5e7a75d01a5f3d5a6702ab8ccd2ff40d
http://security.gentoo.org/glsa/glsa-201309-01.xml
http://www.debian.org/security/2015/dsa-3368
http://www.openwall.com/lists/oss-security/2013/07/12/3
http://www.openwall.com/lists/oss-security/2013/07/12/6
http://www.openwall.com/lists/oss-security/2013/07/13/1
http://www.openwall.com/lists/oss-security/2013/07/15/1
http://www.ubuntu.com/usn/USN-2755-1
https://www.linuxquestions.org/questions/slackware-14/%5Bslackware-current%5D-glibc-2-17-shadow-and-other-penumbrae-4175461061/
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