libxml 2.9.3 parser.c xmlParserEntityCheck/xmlParseAttValueComplex XML Document input validation

CVSS Meta Temp Score
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CTI Interest Score
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8.5$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in libxml 2.9.3. This impacts the function xmlParserEntityCheck/xmlParseAttValueComplex of the file parser.c. This manipulation as part of XML Document causes input validation. This vulnerability is registered as CVE-2016-3705. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in libxml 2.9.3. It has been declared as critical. Affected by this vulnerability is the function xmlParserEntityCheck/xmlParseAttValueComplex of the file parser.c. The manipulation as part of a XML Document leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The (1) xmlParserEntityCheck and (2) xmlParseAttValueComplex functions in parser.c in libxml2 2.9.3 do not properly keep track of the recursion depth, which allows context-dependent attackers to cause a denial of service (stack consumption and application crash) via a crafted XML document containing a large number of nested entity references.

The weakness was published 05/17/2016 (Website). It is possible to read the advisory at bugzilla.gnome.org. This vulnerability is known as CVE-2016-3705 since 03/30/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 91447 (Debian DSA-3593-1 : libxml2 - 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 43650 (Juniper Junos Multiple vulnerabilities in libxml2 (JSA10916)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (91447) and SecurityFocus (BID 89854†). Similar entries are available at VDB-81409, VDB-87476, VDB-87477 and VDB-87478. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.7
VulDB Meta Temp Score: 8.5

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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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: 91447
Nessus Name: Debian DSA-3593-1 : libxml2 - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2016-719
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

03/30/2016 🔍
05/04/2016 +35 days 🔍
05/17/2016 +13 days 🔍
05/17/2016 +0 days 🔍
05/18/2016 +1 days 🔍
06/02/2016 +15 days 🔍
06/03/2016 +1 days 🔍
08/19/2022 +2268 days 🔍

Sourcesinfo

Advisory: RHSA-2016:1292
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-3705 (🔍)
GCVE (CVE): GCVE-0-2016-3705
GCVE (VulDB): GCVE-100-87415

OVAL: 🔍

SecurityFocus: 89854 - libxml2 CVE-2016-3705 Stack Buffer Overflow Vulnerability

See also: 🔍

Entryinfo

Created: 05/18/2016 09:54
Updated: 08/19/2022 14:51
Changes: 05/18/2016 09:54 (66), 11/30/2018 11:57 (14), 08/19/2022 14:51 (4)
Complete: 🔍
Cache ID: 216::103

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