MIT Kerberos 5 (krb5) asn1_decode_generaltime() function denial of service

kerberos-asn1decodegeneraltime-dos (49749) The risk level is classified as MediumMedium Risk

Description:

MIT Kerberos 5 (krb5) is vulnerable to a denial of service, caused by an error in the ASN.1 GeneralizedTime decoder asn1_decode_generaltime() function. A remote attacker could exploit this vulnerability using vectors related to invalid DER encoding that triggers a free of an uninitialized pointer to cause a denial of service.

*CVSS:

Base Score: 10
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
 
Temporal Score: 7.4
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

For Apple Mac OS:
Apply Apple Security Update 2009-002, available from the Apple Web site. See References.

Refer to MITKRB5-SA-2009-002 for patch, upgrade or suggested workaround information. See References.

For other distributions:
Apply the appropriate patch for your system. See References.

References:

  • Apple Web site: About the security content of Security Update 2009-002 / Mac OS X v10.5.7.
  • MITKRB5-SA-2009-001: multiple vulnerabilities in SPNEGO, ASN.1 decoder.
  • MITKRB5-SA-2009-002: ASN.1 decoder frees uninitialized pointer.
  • Novell Document ID: 5047181: NKDC 20090409.
  • Sun Alert ID: 256728: Multiple Security Vulnerabilities in the Solaris Kerberos 'Mech' Libraries May Lead To Execution of Arbitrary Code, Unauthorized Access to Data or a Denial of Service (DoS) Condition.
  • ASA-2009-162: krb5 security update (RHSA-2009-0409)
  • ASA-2009-164: krb5 security update (RHSA-2009-0410)
  • BID-34409: MIT Kerberos 'asn1_decode_generaltime()' Uninitialized Pointer Memory Corruption Vulnerability
  • CVE-2009-0846: The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) before 1.6.4 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via vectors involving an invalid DER encoding that triggers a free of an uninitialized pointer.
  • DSA-1766: krb5 -- several vulnerabilities
  • GLSA-200904-09: MIT Kerberos 5: Multiple vulnerabilities
  • MDVSA-2009:098: krb5
  • MDVSA-2009:098-1: krb5
  • MDVSA-2010:005: krb5
  • RHSA-2009-0408: Important: krb5 security update
  • RHSA-2009-0409: Important: krb5 security update
  • RHSA-2009-0410: Critical: krb5 security update
  • SA34347: Kerberos "spnego_gss_accept_sec_context()" Denial of Service
  • SA34640: Sun Solaris / SEAM Kerberos Multiple Vulnerabilities
  • SA34734: Novell Kerberos KDC Multiple Vulnerabilities
  • SA35074: Apple Mac OS X Security Update Fixes Multiple Vulnerabilities
  • SECTRACK ID: 1021994: Kerberos ASN.1 GeneralizedTime Decoder Bug Lets Remote Users Execute Arbitrary Code
  • SUSE-SA:2009:019: krb5 security problems
  • USN-755-1: Kerberos vulnerabilities

Platforms Affected:

  • Apple Mac OS X 10.4.11
  • Apple Mac OS X 10.5
  • Apple Mac OS X 10.5.1
  • Apple Mac OS X 10.5.2
  • Apple Mac OS X 10.5.3
  • Apple Mac OS X 10.5.4
  • Apple Mac OS X 10.5.5
  • Apple Mac OS X 10.5.6
  • Apple Mac OS X Server 10.4.11
  • Apple Mac OS X Server 10.5
  • Apple Mac OS X Server 10.5.1
  • Apple Mac OS X Server 10.5.2
  • Apple Mac OS X Server 10.5.3
  • Apple Mac OS X Server 10.5.4
  • Apple Mac OS X Server 10.5.5
  • Apple Mac OS X Server 10.5.6
  • Canonical Ubuntu 6.06 LTS
  • Canonical Ubuntu 7.10
  • Canonical Ubuntu 8.04 LTS
  • Canonical Ubuntu 8.10
  • Debian Debian Linux 4.0
  • Debian Debian Linux 5.0
  • Gentoo Linux
  • MandrakeSoft Mandrake Linux 2008.0
  • MandrakeSoft Mandrake Linux 2008.0 X86_64
  • MandrakeSoft Mandrake Linux 2008.1
  • MandrakeSoft Mandrake Linux 2008.1 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • MandrakeSoft Mandrake Multi Network Firewall 2.0
  • Mandriva Linux 2009.0
  • Mandriva Linux 2009.0 X86_64
  • MIT Kerberos 5
  • MIT Kerberos 5 1.0
  • MIT Kerberos 5 1.0.6
  • MIT Kerberos 5 1.1
  • MIT Kerberos 5 1.1.1
  • MIT Kerberos 5 1.2 Beta1
  • MIT Kerberos 5 1.2 Beta2
  • MIT Kerberos 5 1.3.3
  • MIT Kerberos 5-1.1
  • MIT Kerberos 5-1.2
  • MIT Kerberos 5-1.2.1
  • MIT Kerberos 5-1.2.2
  • MIT Kerberos 5-1.2.3
  • MIT Kerberos 5-1.2.4
  • MIT Kerberos 5-1.2.5
  • MIT Kerberos 5-1.2.6
  • MIT Kerberos 5-1.2.7
  • MIT Kerberos 5-1.2.8
  • MIT Kerberos 5-1.3
  • MIT Kerberos 5-1.3 Alpha1
  • MIT Kerberos 5-1.3.1
  • MIT Kerberos 5-1.3.2
  • MIT Kerberos 5-1.3.3
  • MIT Kerberos 5-1.3.4
  • MIT Kerberos 5-1.3.5
  • MIT Kerberos 5-1.3.6
  • MIT Kerberos 5-1.4
  • MIT Kerberos 5-1.4.1
  • MIT Kerberos 5-1.4.2
  • MIT Kerberos 5-1.4.3
  • MIT Kerberos 5-1.4.4
  • MIT Kerberos 5-1.5
  • MIT Kerberos 5-1.5.1
  • MIT Kerberos 5-1.5.2
  • MIT Kerberos 5-1.5.3
  • MIT Kerberos 5-1.6
  • MIT Kerberos 5-1.6.1
  • MIT Kerberos 5-1.6.2
  • MIT Kerberos 5-1.6.3
  • Novell Open Enterprise Server 2 AMD64
  • Novell Open Enterprise Server 2 x86
  • Novell Open Enterprise Server 2 Intel EM64T
  • Novell OpenSUSE 10.3
  • Novell OpenSUSE 11.0
  • Novell SLE SDK 10 SP2
  • Novell SUSE Linux Enterprise 10 SP2 DEBUGINFO
  • Novell SUSE Linux Enterprise Desktop 10 SP2
  • Novell SUSE Linux Enterprise Server 10 SP2
  • RedHat Enterprise Linux 2.1 AS
  • RedHat Enterprise Linux 2.1 ES
  • RedHat Enterprise Linux 2.1 WS
  • RedHat Enterprise Linux 3 WS
  • RedHat Enterprise Linux 3 ES
  • RedHat Enterprise Linux 3 AS
  • RedHat Enterprise Linux 3 Desktop
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4.7.z AS
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 5.3.z EUS
  • RedHat Enterprise Linux Long Life 5.3
  • RedHat Linux Advanced Workstation 2.1 Itanium
  • RedHat Red Hat Enterprise Linux 4.7.z ES
  • Sun OpenSolaris
  • Sun SEAM 1.0.1
  • Sun SEAM 1.0.1 Supplemental
  • Sun Solaris 10 SPARC
  • Sun Solaris 10 x86
  • Sun Solaris 8 SPARC
  • Sun Solaris 8 x86
  • Sun Solaris 9 SPARC
  • Sun Solaris 9 x86

Reported:

Apr 07, 2009

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