MIT Kerberos 5 (krb5) spnego_gss_accept_sec_context() function denial of service
| kerberos-spnego-dos (49448) |  Medium Risk |
Description:
MIT Kerberos 5 (krb5) is vulnerable to a denial of service, caused by a NULL pointer dereference error in the spnego_gss_accept_sec_context() function. By sending a specially-crafted NegTokenInit token, a remote attacker could exploit this vulnerability to cause the daemon to crash.
*CVSS:
| Base Score: | 5 |
| Access Vector: | Network |
| Access Complexity: | Low |
| Authentication: | None |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 3.8 |
| Exploitability: | Unproven |
| Remediation Level: | Temporary-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.
Apply the patch for this vulnerability (spnego_mech.c), available from the MIT Kerberos 5 (krb5) SVN Repository. See References.
For other distributions:
Apply the appropriate update for your system. See References.
References:
- Apple Web site: About the security content of Security Update 2009-002 / Mac OS X v10.5.7.
- MIT Kerberos 5 (krb5) SVN Repository: krb5:/trunk/src/lib/gssapi/spnego/spnego_mech.c .
- MIT krb5 Security Advisory 2009-001: multiple vulnerabilities in SPNEGO, ASN.1 decoder.
- MITKRB5-SA-2009-001: multiple vulnerabilities in SPNEGO, ASN.1 decoder.
- Novell Document ID: 5047180: NKDC 20090409.
- RT/krbdev.mit.edu: Ticket #6402: CVE-2009-0845 SPNEGO can dereference a null pointer .
- 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.
- BID-34257: MIT Kerberos 'NegTokenInit' Token Handling Remote Denial Of Service Vulnerability
- CVE-2009-0845: The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3, when SPNEGO is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via invalid ContextFlags data in the reqFlags field in a negTokenInit token.
- DSA-1766: krb5 -- several vulnerabilities
- GLSA-200904-09: MIT Kerberos 5: Multiple vulnerabilities
- MDVSA-2009:082: krb5
- MDVSA-2009:098: krb5
- MDVSA-2009:098-1: krb5
- RHSA-2009-0408: Important: 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: 1021867: Kerberos GSS-API SPNEGO Null Pointer Dereference and Invalid Memory Access Bugs Let Remote Denial of Service
- SUSE-SA:2009:019: krb5 security problems
- USN-755-1: Kerberos vulnerabilities
- VUPEN/ADV-2009-0847: Kerberos spnego_gss_accept_sec_context() Denial of Service Issue
- VUPEN/ADV-2009-0976: Sun Solaris and SEAM Kerberos Code Execution and DoS Vulnerabilities
- VUPEN/ADV-2009-1057: Novell Kerberos KDC Code Execution and Denial of Service Vulnerabilities
- VUPEN/ADV-2009-1106: Avaya CMS Solaris Kerberos Code Execution and DoS Vulnerabilities
- VUPEN/ADV-2009-1297: Apple Mac OS X Code Execution and Security Bypass Vulnerabilities
- VUPEN/ADV-2009-2248: IBM Network Authentication Service for DB2 Multiple Vulnerabilities
Platforms Affected:
- 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 10.5
- 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 X86_64
- MandrakeSoft Mandrake Linux 2008.1
- MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 3.0
- MandrakeSoft Mandrake Linux Corporate Server 4.0
- MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
- Mandriva Linux 2009.0 X86_64
- Mandriva Linux 2009.0
- MIT Kerberos 5-1.6.3
- Novell Open Enterprise Server 2 Intel EM64T
- Novell Open Enterprise Server 2 AMD64
- Novell Open Enterprise Server 2 x86
- 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 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
- Sun OpenSolaris
- Sun Solaris 10 SPARC
- Sun Solaris 10 x86
Reported:
Mar 06, 2009
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