Samba up to 4.0.17 DNS Reply Flag input validation

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

Summaryinfo

A vulnerability was found in Samba. It has been rated as problematic. This issue affects some unknown processing of the component DNS Reply Flag Handler. The manipulation leads to input validation. This vulnerability is documented as CVE-2014-0239. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Samba (File Transfer Software). It has been rated as problematic. This issue affects an unknown function of the component DNS Reply Flag Handler. 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:

The internal DNS server in Samba 4.x before 4.0.18 does not check the QR field in the header section of an incoming DNS message before sending a response, which allows remote attackers to cause a denial of service (CPU and bandwidth consumption) via a forged response packet that triggers a communication loop, a related issue to CVE-1999-0103.

The weakness was released 05/27/2014 with Samba as CVE-2014-0239.html as confirmed advisory (Website) via IRC. It is possible to read the advisory at samba.org. The identification of this vulnerability is CVE-2014-0239 since 12/03/2013. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The advisory points out:

The server will not check the "reply" flag in the DNS packet header when processing a request. That makes it vulnerable to reply to a spoofed reply packet with another reply. Two affected servers could thus DOS each other.

The vulnerability scanner Nessus provides a plugin with the ID 74242 (Samba 4.x < 4.0.18 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc.. The commercial vulnerability scanner Qualys is able to test this issue with plugin 195533 (Ubuntu Security Notification for Samba Vulnerabilities (USN-2257-1)).

Upgrading to version 4.0.18 eliminates this vulnerability. The upgrade is hosted for download at samba.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

Use the BIND_DLZ DNS backend to avoid this issue. (...) Patch provided by Kai Blin of the Samba team.

The vulnerability is also documented in the databases at X-Force (93445), Tenable (74242), SecurityFocus (BID 67691†), Secunia (SA59579†) and SecurityTracker (ID 1030309†). bugzilla.redhat.com is providing further details. Entry connected to this vulnerability is available at VDB-13388. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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: 74242
Nessus Name: Samba 4.x < 4.0.18 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus 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 4.0.18
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Fortigate IPS: 🔍

Timelineinfo

12/03/2013 🔍
05/27/2014 +175 days 🔍
05/27/2014 +0 days 🔍
05/28/2014 +1 days 🔍
05/28/2014 +0 days 🔍
05/28/2014 +0 days 🔍
05/29/2014 +1 days 🔍
05/29/2014 +0 days 🔍
05/29/2014 +0 days 🔍
06/27/2014 +29 days 🔍
06/20/2021 +2550 days 🔍

Sourcesinfo

Product: samba.org

Advisory: CVE-2014-0239.html
Organization: Samba
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-0239 (🔍)
GCVE (CVE): GCVE-0-2014-0239
GCVE (VulDB): GCVE-100-13391

OVAL: 🔍
IAVM: 🔍

X-Force: 93445 - Samba dns_process_send() denial of service, Medium Risk
SecurityFocus: 67691 - Samba DNS Protocol Handling Denial of Service Vulnerability
Secunia: 59579 - Ubuntu update for samba, Less Critical
SecurityTracker: 1030309 - Samba DNS Reply Flag Processing Flaw Lets Remote Users Deny Service
Vulnerability Center: 44694 - Samba 4.x before 4.0.18 Remote DoS via Malformed Packets, Medium

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 05/29/2014 17:30
Updated: 06/20/2021 13:23
Changes: 05/29/2014 17:30 (81), 05/29/2017 09:01 (14), 06/20/2021 13:23 (3)
Complete: 🔍
Cache ID: 216:01C:103

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