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Last updated: 10/26/2014 12:35:12 AM

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National Cyber Awareness System

Vulnerability Summary for CVE-2009-4212

Original release date: 01/13/2010
Last revised: 09/06/2011
Source: US-CERT/NIST

Overview

Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 through 1.6.3, and 1.7 before 1.7.1, allow remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code by providing ciphertext with a length that is too short to be valid.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 10.0 (HIGH) (AV:N/AC:L/Au:N/C:C/I:C/A:C) (legend)
Impact Subscore: 10.0
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
Per: http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-004.txt "Only releases krb5-1.3 and later are vulnerable, as earlier releases did not contain the functionality implemented by the vulnerable code. This is an implementation vulnerability in MIT krb5, and is not a vulnerability in the Kerberos protocol."

Solution

Per: http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-004.txt FIXES ===== * The upcoming krb5-1.7.1 and krb5-1.6.4 releases will contain a fix for this vulnerability. * For the krb5-1.7 release, apply the patch available at: http://web.mit.edu/kerberos/advisories/2009-004-patch_1.7.txt A PGP-signed patch is available at http://web.mit.edu/kerberos/advisories/2009-004-patch_1.7.txt.asc * For the krb5-1.6 releases, apply the patch available at: http://web.mit.edu/kerberos/advisories/2009-004-patch_1.6.3.txt A PGP-signed patch is available at http://web.mit.edu/kerberos/advisories/2009-004-patch_1.6.3.txt.asc * The krb5-1.6.3 patch might apply successfully to older releases.

References to Advisories, Solutions, and Tools

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External Source: SECUNIA
Name: 38184
External Source: SECUNIA
Name: 38203
External Source: OVAL
Name: oval:org.mitre.oval:def:7357
External Source: MANDRIVA
Name: MDVSA-2010:006
External Source: SUNALERT
Name: 1021779
External Source: SECTRACK
Name: 1023440
External Source: REDHAT
Name: RHSA-2010:0029
External Source: HP
Name: HPSBOV02682
External Source: SECUNIA
Name: 38126
External Source: OVAL
Name: oval:org.mitre.oval:def:11272
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=545015
Type: Patch Information
External Source: SECUNIA
Name: 38696
External Source: FEDORA
Name: FEDORA-2010-0515
External Source: CONFIRM
Name: http://support.avaya.com/css/P8/documents/100074869
External Source: SECUNIA
Name: 38108
External Source: SUNALERT
Name: 275530
External Source: FEDORA
Name: FEDORA-2010-0503
External Source: SECUNIA
Name: 38080
External Source: UBUNTU
Name: USN-881-1
External Source: VUPEN
Name: ADV-2010-1481
External Source: SECUNIA
Name: 40220
External Source: VUPEN
Name: ADV-2010-0096
External Source: VUPEN
Name: ADV-2010-0129
External Source: DEBIAN
Name: DSA-1969
External Source: CONFIRM
Name: http://support.apple.com/kb/HT4188
External Source: OVAL
Name: oval:org.mitre.oval:def:8192
External Source: SECUNIA
Name: 38140
External Source: HP
Name: SSRT100495
External Source: CONFIRM
Name: http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-004.txt
Type: Advisory; Patch Information
External Source: APPLE
Name: APPLE-SA-2010-06-15-1
External Source: REDHAT
Name: RHSA-2010:0095
External Source: BID
Name: 37749

References to Check Content

Identifier: oval:org.mitre.oval:def:11272
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5
Identifier: oval:org.mitre.oval:def:7357
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5
Identifier: oval:org.mitre.oval:def:8192
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5

Technical Details

Vulnerability Type (View All)