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CVE-2017-17439

Date: December 6, 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.

Language: C

Severity Score

Related Resources (11)

http://www.h5l.org/pipermail/heimdal-announce/2017-December/000008.html
https://security.alpinelinux.org/vuln/CVE-2017-17439
http://h5l.org/advisories.html?show=2017-12-08
https://www.debian.org/security/2017/dsa-4055
https://security-tracker.debian.org/tracker/CVE-2017-17439
http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878144
https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887
https://github.com/heimdal/heimdal/issues/353
https://nvd.nist.gov/vuln/detail/CVE-2017-17439
https://www.mend.io/vulnerability-database/CVE-2017-17439

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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