Samba up to 4.1.21 AD Domain Controller resource management

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Samba up to 4.1.21. It has been classified as problematic. The affected element is an unknown function of the component AD Domain Controller. This manipulation causes resource management. This vulnerability is tracked as CVE-2015-7540. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Samba up to 4.1.21 (File Transfer Software) and classified as critical. Affected by this vulnerability is an unknown code block of the component AD Domain Controller. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect confidentiality, and availability. The summary by CVE is:

The LDAP server in the AD domain controller in Samba 4.x before 4.1.22 does not check return values to ensure successful ASN.1 memory allocation, which allows remote attackers to cause a denial of service (memory consumption and daemon crash) via crafted packets.

The weakness was disclosed 12/29/2015 with Codenomicon (Website). It is possible to read the advisory at samba.org. This vulnerability is known as CVE-2015-7540 since 09/29/2015. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 87779 (CentOS 7 : samba (CESA-2016:0006)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 124539 (CentOS Security Update for samba4 (CESA-2016:0010)).

Upgrading to version 4.1.22 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (87779), SecurityFocus (BID 79736†) and Vulnerability Center (SBV-55442†). The entries VDB-79858, VDB-79859, VDB-79860 and VDB-79861 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 87779
Nessus Name: CentOS 7 : samba (CESA-2016:0006)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 80056
OpenVAS Name: Oracle Linux Local Check: ELSA-2016-0010
OpenVAS File: 🔍
OpenVAS Family: 🔍

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 4.1.22
Patch: 530d50a1abdcdf4d1775652d4c456c1274d83d8d

Timelineinfo

09/29/2015 🔍
12/29/2015 +91 days 🔍
12/29/2015 +0 days 🔍
12/29/2015 +0 days 🔍
12/29/2015 +0 days 🔍
12/30/2015 +1 days 🔍
01/02/2016 +3 days 🔍
01/07/2016 +5 days 🔍
01/08/2016 +1 days 🔍
07/02/2022 +2367 days 🔍

Sourcesinfo

Product: samba.org

Advisory: RHSA-2016:0006
Organization: Codenomicon
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-7540 (🔍)
GCVE (CVE): GCVE-0-2015-7540
GCVE (VulDB): GCVE-100-79987

OVAL: 🔍

SecurityFocus: 79736 - Samba CVE-2015-7540 Remote Denial of Service Vulnerability
SecurityTracker: 1034492
Vulnerability Center: 55442 - Samba Remote DoS due to not Checking Return Values to Ensure Successful ASN.1 Memory Allocation, Medium

See also: 🔍

Entryinfo

Created: 01/02/2016 17:43
Updated: 07/02/2022 02:15
Changes: 01/02/2016 17:43 (61), 06/20/2018 08:28 (26), 07/02/2022 02:07 (6), 07/02/2022 02:15 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!