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NULL Pointer Dereference Affecting heimdal package, versions <7.4.0-r2

Severity

 Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
3.43% (89th percentile)

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  • Snyk IDSNYK-ALPINE321-HEIMDAL-8483833
  • published6 Dec 2024
  • disclosed6 Dec 2017
Report a new vulnerability Found a mistake?

Introduced: 6 Dec 2017

CVE-2017-17439  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Alpine:3.21 heimdal to version 7.4.0-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream heimdal package and not the heimdal package as distributed by Alpine. See How to fix? for Alpine:3.21 relevant fixed versions and status.

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.