Samba up to 4.1.5 SAMR Protocol credentials 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.
4.6$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Samba up to 4.1.5. This impacts an unknown function of the component SAMR Protocol Handler. Performing a manipulation results in credentials management. This vulnerability is identified as CVE-2013-4496. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Samba up to 4.1.5 (File Transfer Software). This affects an unknown code of the component SAMR Protocol Handler. The manipulation with an unknown input leads to a credentials management vulnerability. CWE is classifying the issue as CWE-255. This is going to have an impact on confidentiality. The summary by CVE is:

Samba 3.x before 3.6.23, 4.0.x before 4.0.16, and 4.1.x before 4.1.6 does not enforce the password-guessing protection mechanism for all interfaces, which makes it easier for remote attackers to obtain access via brute-force ChangePasswordUser2 (1) SAMR or (2) RAP attempts.

The weakness was released 03/05/2014 by Andrew Bartlett as Password lockout not enforced for SAMR password changes as confirmed advisory (Website). The advisory is shared at samba.org. The public release was coordinated with the project team. This vulnerability is uniquely identified as CVE-2013-4496 since 06/12/2013. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1552 for this issue. The advisory points out:

Samba versions 3.4.0 and above allow the administrator to implement locking out Samba accounts after a number of bad password attempts. However, all released versions of Samba did not implement this check for password changes, such as are available over multiple SAMR and RAP interfaces, allowing password guessing attacks.

The vulnerability scanner Nessus provides a plugin with the ID 73046 (Fedora 20 : samba-4.1.6-1.fc20 (2014-3796)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 185124 (HPE HP-UX CIFS-Server Multiple Vulnerabilities (HPSBUX03574)).

Upgrading to version 3.6.23, 4.0.16 or 4.1.6 eliminates this vulnerability. The upgrade is hosted for download at samba.org. The advisory contains the following remark:

Patches for 3.4.17 and 3.5.22 have not been provided as these are now beyond our security support window.

The vulnerability is also documented in the databases at X-Force (91984), Tenable (73046), SecurityFocus (BID 66336†) and Vulnerability Center (SBV-43710†). Entries connected to this vulnerability are available at VDB-7563, VDB-11176, VDB-12645 and VDB-13388. 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: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Credentials management
CWE: CWE-255
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 73046
Nessus Name: Fedora 20 : samba-4.1.6-1.fc20 (2014-3796)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 881915
OpenVAS Name: CentOS Update for libsmbclient CESA-2014:0330 centos6
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Samba 3.6.23/4.0.16/4.1.6

Timelineinfo

06/12/2013 🔍
03/05/2014 +266 days 🔍
03/05/2014 +0 days 🔍
03/05/2014 +0 days 🔍
03/14/2014 +9 days 🔍
03/17/2014 +3 days 🔍
03/24/2014 +7 days 🔍
03/25/2014 +1 days 🔍
06/16/2021 +2640 days 🔍

Sourcesinfo

Product: samba.org

Advisory: Password lockout not enforced for SAMR password changes
Researcher: Andrew Bartlett
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-4496 (🔍)
GCVE (CVE): GCVE-0-2013-4496
GCVE (VulDB): GCVE-100-12681

OVAL: 🔍

X-Force: 91984 - Samba SAMR information disclosure, Medium Risk
SecurityFocus: 66336 - Samba SAMR Server Password Lockout Bypass Information Disclosure Weakness
Vulnerability Center: 43710 - Samba 3, 4.0, 4.1 Remote Security Bypass via Brute Force ChangePasswordUser2, Medium

See also: 🔍

Entryinfo

Created: 03/25/2014 09:02
Updated: 06/16/2021 08:46
Changes: 03/25/2014 09:02 (84), 05/24/2017 09:06 (3), 06/16/2021 08:46 (3)
Complete: 🔍
Cache ID: 216:D52:103

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!