CVE-2017-17439

In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.

Date published : 2017-12-06

http://h5l.org/advisories.html?show=2017-12-08

http://www.h5l.org/pipermail/heimdal-announce/2017-December/000008.html