SynopsisThe telnet server has a remote buffer overflow vulnerability.
DescriptionA buffer overflow exists in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.2 and earlier, and Heimdal 1.5.1 and earlier. The vulnerability also affects any 'telnetd' service derived from the FreeBSD codebase.
Successful exploitation could allow a remote attacker to execute arbitrary code via a long encryption key.
Note that this vulnerability has been exploited in the wild since December 2011.
SolutionUpgrade to the version of FreeBSD 'telnetd' specified in the vendor's advisory.