CVEvulnerability

CVE-2017-17439

7.5 HIGH Published 2017-12-06 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2017-12-06
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.0 ([email protected])
7.5 HIGH — CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
Weaknesses
CWE-476

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.

Affected configurations

• debian debian linux 9.0 • heimdal project heimdal (<= 7.4.0)

Related

Weakness · CWE (1)

  • CWE-476 NULL Pointer Dereference weakness

References