A vulnerability has been found in KTH Kerberos 4/5 and classified as critical. This vulnerability affects an unknown function of the component Telnet Handler. The manipulation with an unknown input leads to a missing encryption vulnerability. The CWE definition for the vulnerability is CWE-311. The product does not encrypt sensitive or critical information before storage or transmission. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Kerberos Telnet protocol, as implemented by KTH Kerberos IV and Kerberos V (Heimdal), does not encrypt authentication and encryption options sent from the server, which allows remote attackers to downgrade authentication and encryption mechanisms via a man-in-the-middle attack.

The weakness was presented 08/27/2001 as confirmed advisory (CERT.org). The advisory is shared for download at kb.cert.org. This vulnerability was named CVE-2001-1444 since 04/21/2005. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at X-Force (10640). See VDB-17247 for similar entry.

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• KTH

Name

• Kerberos

Version

• 4
• 5

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