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Last updated: 10/23/2014 12:43:36 PM

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Vulnerability Summary for CVE-2013-2179

Original release date: 12/26/2013
Last revised: 12/27/2013
Source: US-CERT/NIST

Overview

X.Org xdm 1.1.10, 1.1.11, and possibly other versions, when performing authentication using certain implementations of the crypt API function that can return NULL, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by attempting to log into an account whose password field contains invalid characters, as demonstrated using the crypt function from glibc 2.17 and later with (1) the "!" character in the salt portion of a password field or (2) a password that has been encrypted using DES or MD5 in FIPS-140 mode.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 4.3 (MEDIUM) (AV:N/AC:M/Au:N/C:N/I:N/A:P) (legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows disruption of service

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External Source: CONFIRM
Name: http://cgit.freedesktop.org/xorg/app/xdm/commit/?id=8d1eb5c74413e4c9a21f689fc106949b121c0117
Type: Patch Information; Exploit
External Source: SUSE
Name: openSUSE-SU-2013:1117
External Source: MLIST
Name: [oss-security] 20130613 Re: CVE request for possible NULL ptr deref in XDM when using crypt() from glibc 2.17+
External Source: CONFIRM
Name: https://bugs.mageia.org/show_bug.cgi?id=10682

Technical Details

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