Title: SSH1 SSH Daemon Logging Failure Vulnerability
Severity: HIGH
Description:
SSH1 is the implementation of the Secure Shell communication protocol by SSH Communications. SSH1 is version 1 of the protocol specified by IETF draft to protect the integrity of traffic over the network.
The commercial implementation of the SSH version 1 product distributed by SSH Communications contains a flaw in the logging routine that could allow remote users to brute force attack a system, and remain unlogged by system logging utilities. The problem is manifested in the logging code for the included authentication methods of password authentication, RSA authentication, RhostsRSA authentication, TIS authentication, and Kerberos4 authentication. Kerberos5 authentication logging is not affected by this bug.
The source of the ssh 1.2.30 package does not log attempts to brute force any of the affected authentication schemes beyond the fourth attempt by a remote user. Therefore, a malicious user can launch a continuous brute force password attack that can continue until success, and no information will be logged via syslog.
Affected Products:
- SSH Communications Security SSH 1.2.30
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