Kerberos GSS-API SPNEGO Null Pointer Dereference and Invalid Memory Access Bugs Let Remote Denial of Service
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SecurityTracker Alert ID: 1021867 |
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SecurityTracker URL: http://securitytracker.com/id/1021867
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CVE Reference:
CVE-2009-0844, CVE-2009-0845
(Links to External Site)
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Updated: Mar 24 2010
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Original Entry Date: Mar 20 2009
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 5
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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].
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Impact:
A remote user can cause the target daemon to crash.
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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]
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Vendor URL: web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt (Links to External Site)
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Cause:
Access control error, State error
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Underlying OS: Linux (Any), UNIX (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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[Original Message Not Available for Viewing]
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