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MIT krb5 Security Advisory 2010-002
Original release: 2010-03-23
Last update: 2010-03-23
Topic: denial of service in SPNEGO
denial of service in SPNEGO
CVSSv2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C/E:POC/RL:OF/RC:C
CVSSv2 Base Score: 7.8
Access Vector: Network
Access Complexity: Low
Confidentiality Impact: None
Integrity Impact: None
Availability Impact: Complete
CVSSv2 Temporal Score: 6.1
Remediation Level: Official Fix
Report Confidence: Confirmed
In MIT krb5 releases krb5-1.7 and later, the SPNEGO GSS-API mechanism
can experience an assertion failure when receiving certain invalid
messages. This can cause a GSS-API application to crash.
This is an implementation vulnerability in MIT krb5, and not a
vulnerability in the Kerberos protocol.
An unauthenticated remote attacker could cause a GSS-API application,
including the Kerberos administration daemon (kadmind) to crash.
* kadmind in MIT releases krb5-1.7 and later
* FTP daemon in MIT releases krb5-1.7 and later
* Third-party software using the GSS-API library from MIT krb5
releases krb5-1.7 and later
* MIT releases prior to krb5-1.7 did not contain the vulnerable code.
* The upcoming krb5-1.7.2 and krb5-1.8.1 releases will contain fixes
for this vulnerability.
* Apply the patch available at
A PGP-signed patch is available at
This announcement is posted at:
This announcement and related security advisories may be found on the
MIT Kerberos security advisory page at:
The main MIT Kerberos web page is at:
Thanks to Nalin Dahyabhai, Jan iankko Lieskovsky, and Zbysek Mraz (all
from Red Hat) for discovering and reporting this vulnerability.
The MIT Kerberos Team security contact address is