CVE-2017-17439

CVSS V2 Medium 5 CVSS V3 High 7.5
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.
Overview
  • CVE ID
  • CVE-2017-17439
  • Assigner
  • cve@mitre.org
  • Vulnerability Status
  • Modified
  • Published Version
  • 2017-12-06T15:29:00
  • Last Modified Date
  • 2017-12-30T02:29:02
Weakness Enumerations
CWE URL
CWE-476 http://cwe.mitre.org/data/definitions/476.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* 1 OR 7.4.0
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:L/Au:N/C:N/I:N/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • PARTIAL
  • Base Score
  • 5
  • Severity
  • MEDIUM
  • Exploitability Score
  • 10
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.0
  • Vector String
  • CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 7.5
  • Base Severity
  • HIGH
  • Exploitability Score
  • 3.9
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://github.com/heimdal/heimdal/issues/353 Patch Third Party Advisory
https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887 Third Party Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878144 Issue Tracking Mailing List Third Party Advisory
http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html Third Party Advisory
https://www.debian.org/security/2017/dsa-4055 Third Party Advisory
http://www.h5l.org/pipermail/heimdal-announce/2017-December/000008.html
http://h5l.org/advisories.html?show=2017-12-08
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2017-17439
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17439
History
Created Old Value New Value Data Type Notes
2022-05-10 18:53:56 Added to TrackCVE
2022-12-02 23:44:15 2017-12-06T15:29Z 2017-12-06T15:29:00 CVE Published Date updated
2022-12-02 23:44:15 2017-12-30T02:29:02 CVE Modified Date updated
2022-12-02 23:44:15 Modified Vulnerability Status updated