Samba up to 4.7.8/4.8.3 Active Directory Domain Controller null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Samba up to 4.7.8/4.8.3. The affected element is an unknown function of the component Active Directory Domain Controller. Such manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2018-10918. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Samba up to 4.7.8/4.8.3 (File Transfer Software). Affected by this issue is an unknown part of the component Active Directory Domain Controller. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

A null pointer dereference flaw was found in the way samba checked database outputs from the LDB database layer. An authenticated attacker could use this flaw to crash a samba server in an Active Directory Domain Controller configuration. Samba versions before 4.7.9 and 4.8.4 are vulnerable.

The bug was discovered 08/14/2018. The weakness was published 08/22/2018 as confirmed bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is handled as CVE-2018-10918 since 05/09/2018. The attack may be launched remotely. A simple authentication is necessary for exploitation. There are neither technical details nor an exploit 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 to version 4.7.9 or 4.8.4 eliminates this vulnerability. A possible mitigation has been published 2 hours after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (112051) and SecurityFocus (BID 105083†). Similar entries are available at VDB-123141, VDB-123142 and VDB-123143. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 5.2
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 112051
Nessus Name: Fedora 27 : 2:samba (2018-8e4d871867)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Samba 4.7.9/4.8.4

Timelineinfo

05/09/2018 🔍
08/14/2018 +97 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 🔍
05/04/2023 +1715 days 🔍

Sourcesinfo

Product: samba.org

Advisory: USN-3738-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-10918 (🔍)
GCVE (CVE): GCVE-0-2018-10918
GCVE (VulDB): GCVE-100-123140
SecurityFocus: 105083 - Samba CVE-2018-10918 Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 08/23/2018 06:39
Updated: 05/04/2023 09:44
Changes: 08/23/2018 06:39 (74), 03/17/2020 15:18 (5), 05/04/2023 09:41 (4), 05/04/2023 09:44 (11)
Complete: 🔍
Cache ID: 216::103

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