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This project will be discontinued after December 13, 2021. [more]
2017-12-06
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.
Products | Debian_linux, Heimdal |
Type | NULL Pointer Dereference (CWE-476) |
First patch |
https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887 |
Relevant file/s | ./kdc/kerberos5.c (modified, +5, -3) |
Links |
• https://github.com/heimdal/heimdal/issues/353
• http://h5l.org/advisories.html?show=2017-12-08 • http://www.h5l.org/pipermail/heimdal-announce/2017-December/000008.html • http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html • https://www.debian.org/security/2017/dsa-4055 |
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