Rapid7 Vulnerability & Exploit Database

Alpine Linux: CVE-2017-17439: heimdal NULL pointer dereference via crafted UDP packets

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Alpine Linux: CVE-2017-17439: heimdal NULL pointer dereference via crafted UDP packets

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
12/06/2017
Created
07/25/2018
Added
01/03/2018
Modified
12/04/2019

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.

Solution(s)

  • alpine-linux-upgrade-heimdal

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