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CVE-2017-17439

Published: 6 December 2017

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.

Notes

AuthorNote
mdeslaur
vulnerability introduced in 7.0
heimdal-kdc package is in universe

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
heimdal
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Not vulnerable
(7.5.0+dfsg-1)
cosmic Not vulnerable
(7.5.0+dfsg-1)
trusty Not vulnerable
(code not present)
upstream
Released (7.5.0+dfsg-1)
xenial Not vulnerable
(code not present)
zesty Ignored
(end of life)
Patches:
upstream: https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887
Binaries built from this source package are in Universe and so are supported by the community.

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H