Apache Subversion up to 1.8.15/1.9.3 svnserve svnserve/cyrus_auth.c realm_len access control

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6.5$0-$5k0.00

A vulnerability was found in Apache Subversion up to 1.8.15/1.9.3 (Versioning Software). It has been classified as critical. Affected is an unknown function of the file svnserve/cyrus_auth.c of the component svnserve. The manipulation of the argument realm_len with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-284. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 04/29/2016 by Daniel Shahaf and James McCoy as CVE-2016-2167-advisory.txt as confirmed advisory (Website). The advisory is shared for download at subversion.apache.org. This vulnerability is traded as CVE-2016-2167 since 01/29/2016. It is possible to launch the attack remotely. The successful exploitation requires a authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 90802 (Slackware 14.0 / 14.1 / current : subversion (SSA:2016-121-01)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Slackware Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350887 (Amazon Linux Security Advisory for subversion: AL2012-2016-145).

Applying a patch is able to eliminate this problem. A possible mitigation has been published 1 days after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if (realm_len != inlen-(pos-in+1))
   return SASL_BADPROT;

The vulnerability is also documented in the databases at SecurityFocus (BID 89417), SecurityTracker (ID 1035706) and Tenable (90802). Entry connected to this vulnerability is available at 83077.

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VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.5

VulDB Base Score: 6.8
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.8
NVD Vector: 🔍

CVSSv2infoedit

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 90802
Nessus Name: Slackware 14.0 / 14.1 / current : subversion (SSA:2016-121-01)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
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OpenVAS ID: 71855
OpenVAS Name: Mageia Linux Local Check: mgasa-2016-0161
OpenVAS File: 🔍
OpenVAS Family: 🔍

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Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

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Timelineinfoedit

01/29/2016 🔍
04/28/2016 +90 days 🔍
04/29/2016 +1 days 🔍
04/29/2016 +0 days 🔍
04/30/2016 +1 days 🔍
05/02/2016 +2 days 🔍
05/02/2016 +0 days 🔍
05/05/2016 +3 days 🔍
11/05/2018 +914 days 🔍

Sourcesinfoedit

Vendor: https://www.apache.org/

Advisory: CVE-2016-2167-advisory.txt
Researcher: Daniel Shahaf/James McCoy
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-2167 (🔍)
OVAL: 🔍

SecurityFocus: 89417 - Apache Subversion CVE-2016-2167 Authentication Bypass Vulnerability
SecurityTracker: 1035706

See also: 🔍

Entryinfoedit

Created: 05/02/2016 09:01 AM
Updated: 11/05/2018 08:11 AM
Changes: (13) vulnerability_cvss3_vuldb_av vulnerability_cvss3_vuldb_ac vulnerability_cvss3_vuldb_pr vulnerability_cvss3_vuldb_ui vulnerability_cvss3_vuldb_s vulnerability_cvss3_vuldb_c vulnerability_cvss3_vuldb_i vulnerability_cvss3_vuldb_a advisory_confirm_url countermeasure_date source_cve_assigned source_securityfocus_date source_securityfocus_class
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