National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2016-3120 Detail

Current Description

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 6.5 MEDIUM
Vector: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (V3.0 legend)
Impact Score: 3.6
Exploitability Score: 2.8


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 4.0 MEDIUM
Vector: (AV:N/AC:L/Au:S/C:N/I:N/A:P) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): Single
Confidentiality (C): None
Integrity (I): None
Availability (A): Partial
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8458 Issue Tracking
http://lists.opensuse.org/opensuse-updates/2016-09/msg00035.html
http://rhn.redhat.com/errata/RHSA-2016-2591.html
http://web.mit.edu/kerberos/krb5-1.13/
http://web.mit.edu/kerberos/krb5-1.14/
http://www.securityfocus.com/bid/92132
http://www.securitytracker.com/id/1036442
https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
https://lists.debian.org/debian-lts-announce/2018/01/msg00040.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/

Technical Details

Vulnerability Type (View All)

  • NULL Pointer Dereference (CWE-476)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:mit:kerberos:5-1.13:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.13.1:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.13.2:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.13.3:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.13.4:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.13.5:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.13.6:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.14:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.14.1:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:a:mit:kerberos:5-1.14.2:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

6 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2016-3120
NVD Published Date:
07/31/2016
NVD Last Modified:
02/03/2018