cve/2017/CVE-2017-17439.md

CVE-2017-17439

Description

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.

POC

Reference

• https://github.com/heimdal/heimdal/issues/353

Github

• https://github.com/ARPSyndicate/cvemon
• https://github.com/andir/nixos-issue-db-example