Apache Subversion up to 1.8.15/1.9.3 mod_authz_svn mod_authz_svn.c null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Apache Subversion up to 1.8.15/1.9.3. Impacted is an unknown function of the file mod_authz_svn/mod_authz_svn.c of the component mod_authz_svn. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2016-2168. The attack is possible to be carried out remotely. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Apache Subversion up to 1.8.15/1.9.3 (Versioning Software). It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file mod_authz_svn/mod_authz_svn.c of the component mod_authz_svn. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 04/29/2016 by Ivan Zhakov with VisualSVN as CVE-2016-2168-advisory.txt as confirmed advisory (Website). The advisory is shared at subversion.apache.org. This vulnerability is known as CVE-2016-2168 since 01/29/2016. The attack can be launched remotely. The successful exploitation needs a single authentication. Technical details are known, but no exploit is available.

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 l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175729 (Debian Security Update for subversion (DSA 3561-1)).

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:

status = apr_uri_parse(r->pool, dest_uri, &parsed_dest_uri);
if (status)
  {
    ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r,
                  "Invalid URI in Destination header");
    return HTTP_BAD_REQUEST;
  }
if (!parsed_dest_uri.path)
  {
    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                  "Invalid URI in Destination header");
    return HTTP_BAD_REQUEST;
  }

The vulnerability is also documented in the databases at Tenable (90802), SecurityFocus (BID 89320†) and SecurityTracker (ID 1035707†). The entry VDB-83076 is pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.5

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

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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: 90802
Nessus Name: Slackware 14.0 / 14.1 / current : subversion (SSA:2016-121-01)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 71855
OpenVAS Name: Mageia Linux Local Check: mgasa-2016-0161
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: 🔍

Timelineinfo

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 🔍
07/27/2022 +2274 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: CVE-2016-2168-advisory.txt
Researcher: Ivan Zhakov
Organization: VisualSVN
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-2168 (🔍)
GCVE (CVE): GCVE-0-2016-2168
GCVE (VulDB): GCVE-100-83077

OVAL: 🔍

SecurityFocus: 89320 - Apache Subversion CVE-2016-2168 Remote Denial of Service Vulnerability
SecurityTracker: 1035707

See also: 🔍

Entryinfo

Created: 05/02/2016 09:02
Updated: 07/27/2022 15:00
Changes: 05/02/2016 09:02 (74), 11/05/2018 08:11 (15), 07/27/2022 15:00 (3)
Complete: 🔍
Cache ID: 216::103

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