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. Upstream issue: https://github.com/heimdal/heimdal/issues/353 Upstream patch: https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887 References: http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html
Created heimdal tracking bugs for this issue: Affects: epel-all [bug 1524548] Affects: fedora-all [bug 1524547]
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.