National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-16841 Detail

Current Description

Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.

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 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://www.securityfocus.com/bid/106023 Third Party Advisory VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841 Issue Tracking Third Party Advisory
https://security.netapp.com/advisory/ntap-20181127-0001/ Third Party Advisory
https://usn.ubuntu.com/3827-1/ Third Party Advisory
https://usn.ubuntu.com/3827-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4345 Third Party Advisory
https://www.samba.org/samba/security/CVE-2018-16841.html Patch Vendor Advisory

Technical Details

Vulnerability Type (View All)

Known Affected Software Configurations Switch to CPE 2.3

Configuration 1 ( hide )
 cpe:/a:samba:samba
     Show Matching CPE(s)
From (including)
4.3.0
Up to (excluding)
4.7.12
 cpe:/a:samba:samba
     Show Matching CPE(s)
From (including)
4.8.0
Up to (excluding)
4.8.7
 cpe:/a:samba:samba
     Show Matching CPE(s)
From (including)
4.8.8
Up to (excluding)
4.9.3

Configuration 2 ( hide )
 cpe:/o:canonical:ubuntu_linux:12.04::~~esm~~~
     Show Matching CPE(s)
 cpe:/o:canonical:ubuntu_linux:14.04::~~lts~~~
     Show Matching CPE(s)
 cpe:/o:canonical:ubuntu_linux:16.04::~~lts~~~
     Show Matching CPE(s)
 cpe:/o:canonical:ubuntu_linux:18.04::~~lts~~~
     Show Matching CPE(s)
 cpe:/o:canonical:ubuntu_linux:18.10
     Show Matching CPE(s)

Configuration 3 ( hide )
 cpe:/o:debian:debian_linux:9.0
     Show Matching CPE(s)


Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-16841
NVD Published Date:
11/28/2018
NVD Last Modified:
02/04/2019