FreeBSD has acknowledged a vulnerability in telnetd, which can be exploited by malicious people to compromise a vulnerable system.
The vulnerability is caused due to a boundary error within the "encrypt_keyid()" function (crypto/heimdal/appl/telnet/libtelnet/encrypt.c and contrib/telnet/libtelnet/encrypt.c), which can be exploited to cause a buffer overflow by sending specially crafted commands to the server.
NOTE: This vulnerability is currently being actively exploited.
Solution: Update FreeBSD or apply patch.
Provided and/or discovered by: Reported by the vendor.
Original Advisory: FreeBSD-SA-11:08.telnetd:
Do you have additional information related to this advisory?
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Subject: FreeBSD update for telnetd
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