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Vulnerability Note VU#787523MIT Kerberos V5 KDC logging routines use unsafe format stringsOverviewEarly releases of the MIT Kerberos V5 KDC contain format string vulnerabilities that can be used by unauthenticated remote attackers to conduct denial of service attacks on KDC servers.I. DescriptionLogging routines in some (unspecified) versions of the MIT Kerberos V5 Key Distribution Center (KDC) use Kerberos principal names as format strings for printf-style output functions. Principal names that contain certain printf format specifiers (such as '%n') may cause the KDC logging routines to read from or write to memory. Some vulnerable functions are called prior to authentication, therefore these vulnerabilities can be exploited by remote anonymous users. Note that vulnerabilities of this type may allow the execution of arbitrary code under certain circumstances.II. ImpactThis vulnerability may allow unauthenticated remote attackers to crash affected KDC processes, resulting in a denial of service condition.III. SolutionThis vulnerability was addressed in MIT Kerberos V5 1.2.5, released on April 30, 2002. MIT krb5 Security Advisory 2003-001 provides additional information from MIT and is available at:For information regarding other vendors who may be affected, please see the vendor section of this document. Systems Affected
References
The CERT/CC thanks to E. Larry Lidz for discovering this vulnerability and Ken Raeburn of MIT for bringing it to our attention. This document was written by Shawn Van Ittersum and Jeffrey P. Lanza.
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