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Category:   Application (Security)  >   Kerberos Vendors:   MIT
Kerberos GSS-API SPNEGO Null Pointer Dereference and Invalid Memory Access Bugs Let Remote Denial of Service
SecurityTracker Alert ID:  1021867
SecurityTracker URL:  http://securitytracker.com/id/1021867
CVE Reference:   CVE-2009-0844, CVE-2009-0845   (Links to External Site)
Updated:  Mar 24 2010
Original Entry Date:  Mar 20 2009
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5
Description:   Two vulnerabilities were reported in Kerberos. A remote user can cause denial of service conditions.

A remote user can cause the SPNEGO GSS-API get_input_token() function to read beyond the end of a network input buffer and crash [CVE-2009-0844]. Apple Security reported this vulnerability.

A remote user can supply specially crafted ContextFlags in the reqFlags field in NegTokenInit to trigger a null pointer dereference in spnego_gss_accept_sec_context() and cause the target krb5 daemon to crash [CVE-2009-0845].

Impact:   A remote user can cause the target daemon to crash.
Solution:   The vendor has issued a source code patch, available at:

http://web.mit.edu/kerberos/advisories/2009-001-patch.txt

The vendor's advisory is available at:

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt

[Editor's note: The patch for CVE-2009-0845 in conjunction with new functionality introduced in krb5-1.7 created a new vulnerability, described in MITKRB5-SA-2010-002/CVE-2010-0628 (Alert ID 1023733):

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-002.txt]

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Apr 7 2009 (Red Hat Issues Fix) Kerberos GSS-API SPNEGO Null Pointer Dereference and Invalid Memory Access Bugs Let Remote Denial of Service
Red Hat has released a fix for Red Hat Enterprise Linux 5.
Apr 8 2009 (Sun Issues Advisory) Kerberos GSS-API SPNEGO Null Pointer Dereference and Invalid Memory Access Bugs Let Remote Denial of Service
Sun has issued an advisory for Solaris 9, 10, and OpenSolaris.
Sep 1 2009 (VMware Issues Fix for ESX Server) Kerberos GSS-API SPNEGO Null Pointer Dereference and Invalid Memory Access Bugs Let Remote Denial of Service
VMware has issued a fix for VMware ESX Server.



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