An advisory published by the MIT Kerberos team says:
The ASN.1 decoder library in the MIT Kerberos 5 distribution is vulnerable to a denial-of-service attack causing an infinite loop in the decoder. The KDC is vulnerable to this attack.
An unauthenticated remote attacker can cause a KDC or application server to hang inside an infinite loop.
An attacker impersonating a legitimate KDC or application server may cause a client program to hang inside an infinite loop.
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