7.5

CVE-2017-17439

EPSS 9.18%
Published 06.12.2017 15:29:00
Last modified 20.04.2025 01:37:25
Source cve@mitre.org
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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 products Warnungen 0 Metrics 3 CWE 1 References 10

Data is provided by the National Vulnerability Database (NVD)

Debian ≫ Debian Linux Version9.0

Heimdal Project ≫ Heimdal Version <= 7.4.0

Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.

EPSS Metriken
Type	Source	Score	Percentile
EPSS	FIRST.org	9.18%	0.924

CVSS Metriken
Source	Base Score	Exploit Score	Impact Score	Vector string
nvd@nist.gov	7.5	3.9	3.6	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd@nist.gov	5	10	2.9	AV:N/AC:L/Au:N/C:N/I:N/A:P

CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

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

Third Party Advisory

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878144

Third Party Advisory

Mailing List

Issue Tracking

https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887

Third Party Advisory

https://github.com/heimdal/heimdal/issues/353

Patch

Third Party Advisory

https://www.debian.org/security/2017/dsa-4055

Third Party Advisory

https://nvd.nist.gov/vuln/detail/CVE-2017-17439

CVE Source (NVD)

https://cveawg.mitre.org/api/cve/CVE-2017-17439

CVE Source (JSON)

https://euvd.enisa.europa.eu/vulnerability/CVE-2017-17439

EUVD