VDB-81318 · CVE-2016-0771 · BID 84273

Samba up to 4.4.0rc3 DNS TXT Record memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

A vulnerability, which was classified as critical, was found in Samba up to 4.4.0rc3 (File Transfer Software). Affected is some unknown processing of the component DNS TXT Record Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 03/09/2016 by Garming Sam and Douglas Bagnall as CVE-2016-0771.html as confirmed advisory (Website). The advisory is available at samba.org. This vulnerability is traded as CVE-2016-0771 since 12/16/2015. It is possible to launch the attack remotely. Required for exploitation is a authentication. The technical details are unknown and an exploit is not available. The advisory points out:

A malicious client can upload a specially constructed DNS TXT record, resulting in a remote denial-of-service attack. As long as the affected TXT record remains undisturbed in the Samba database, a targeted DNS query may continue to trigger this exploit.

The vulnerability scanner Nessus provides a plugin with the ID 89876 (Debian DSA-3514-1 : samba - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168658 (OpenSuSE Security Update for Security samba (openSUSE-SU-2016:0813-1)).

Upgrading to version 4.4.0rc4, 4.3.6, 4.2.9 or 4.1.23 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

Use of the BIND DNS backend will avoid this issue.

The vulnerability is also documented in the vulnerability database at Tenable (89876). See 81319 for similar entry.

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 89876
Nessus Name: Debian DSA-3514-1 : samba - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703514
OpenVAS Name: Debian Security Advisory DSA 3514-1 (samba - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Samba 4.4.0rc4/4.3.6/4.2.9/4.1.23

Timelineinfo

12/16/2015 🔍
03/08/2016 +83 days 🔍
03/09/2016 +1 days 🔍
03/09/2016 +0 days 🔍
03/09/2016 +0 days 🔍
03/10/2016 +1 days 🔍
03/13/2016 +3 days 🔍
03/13/2016 +0 days 🔍
03/14/2016 +1 days 🔍
03/14/2016 +0 days 🔍
07/10/2022 +2309 days 🔍

Sourcesinfo

Product: samba.org

Advisory: CVE-2016-0771.html
Researcher: Garming Sam, Douglas Bagnall
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0771 (🔍)
OVAL: 🔍

SecurityTracker: 1035219
Vulnerability Center: 57255 - Samba Remote DoS and Information Disclosure via Uploading a Crafted DNS txt Record, Low
SecurityFocus: 84273 - Samba CVE-2016-0771 Out of Bound Read Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 03/10/2016 10:23
Updated: 07/10/2022 08:54
Changes: 03/10/2016 10:23 (81), 01/31/2019 13:35 (12), 07/10/2022 08:54 (3)
Complete: 🔍

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