A vulnerability has been identified in Sun Solaris, which could be exploited by remote attackers to compromise a vulnerable system. This issue is due to an error in the telnet daemon (in.telnetd) that fails to properly validate authentication information before being passed to the login process, which could be exploited by remote attackers to bypass authentication and gain unauthorized access to an affected system with the privileges of an arbitrary user (including the "root" user if the host is configured to accept telnet logins as root).
Note : A worm exploiting this vulnerability has been discovered in the wild.
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