Samba 4.8.x LDAP Server input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

A vulnerability was found in Samba 4.8.x (File Transfer Software) and classified as problematic. This issue affects some unknown processing of the component LDAP Server. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

A missing input sanitization flaw was found in the implementation of LDP database used for the LDAP server. An attacker could use this flaw to cause a denial of service against a samba server, used as a Active Directory Domain Controller. All versions of Samba from 4.8.0 onwards are vulnerable

The bug was discovered 08/14/2018. The weakness was presented 08/22/2018 as Bug 13374 as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.samba.org. The identification of this vulnerability is CVE-2018-1140 since 12/03/2017. Access to the local network is required for this attack to succeed. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 112051 (Fedora 27 : 2:samba (2018-8e4d871867)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171521 (OpenSUSE Security Update for samba (openSUSE-SU-2018:2400-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 hours after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (112051). See 123140, 123141 and 123142 for similar entries.

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CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
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NVD Base Score: 6.5
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CVSSv2info

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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

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Nessus ID: 112051
Nessus Name: Fedora 27 : 2:samba (2018-8e4d871867)
Nessus File: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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Timelineinfo

12/03/2017 🔍
08/14/2018 +253 days 🔍
08/14/2018 +0 days 🔍
08/22/2018 +7 days 🔍
08/22/2018 +0 days 🔍
08/22/2018 +0 days 🔍
08/22/2018 +0 days 🔍
08/23/2018 +1 days 🔍
03/17/2020 +572 days 🔍

Sourcesinfo

Product: samba.org

Advisory: Bug 13374
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-1140 (🔍)
SecurityFocus: 105082 - Samba CVE-2018-1140 Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 08/23/2018 06:41
Updated: 03/17/2020 15:25
Changes: 08/23/2018 06:41 (73), 03/17/2020 15:25 (6)
Complete: 🔍

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