libxml2 2.9.1 Entity Expansion parser.c xmlParserHandlePEReference denial of service

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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in libxml2 2.9.1. This impacts the function xmlParserHandlePEReference of the file parser.c of the component Entity Expansion Handler. Such manipulation leads to denial of service. This vulnerability is traded as CVE-2014-0191. Furthermore, there is an exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in libxml2 2.9.1 (Document Processing Software) and classified as problematic. Affected by this issue is the function xmlParserHandlePEReference of the file parser.c of the component Entity Expansion Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability.

The weakness was shared 04/22/2014 by Daniel Veillard as Do not fetch external parameter entities as confirmed git commit (GIT Repository). The advisory is available at git.gnome.org. This vulnerability is handled as CVE-2014-0191 since 12/03/2013. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

A public exploit has been developed by Dawid Golunski and been published 2 years after the advisory. The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 75373 (openSUSE Security Update : libxml2 / python-libxml2 (openSUSE-SU-2014:0716-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169994 (SUSE Enterprise Linux Security Update for libxml2 (SUSE-SU-2017:1366-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.gnome.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if ((entity->etype == XML_EXTERNAL_PARAMETER_ENTITY) &&
   ((ctxt->options & XML_PARSE_NOENT) == 0) &&
   ((ctxt->options & XML_PARSE_DTDVALID) == 0) &&
   (ctxt->validate == 0))
   return;
The git commit contains the following remark:
external parsed entities will not be loaded, it is not required for a non-validating parser, unless the option of validating, or substituting entities were given. Doing so is far more secure as the parser will only process data coming from the document entity by default.

The vulnerability is also documented in the databases at X-Force (93092), Exploit-DB (38573), Tenable (75373), SecurityFocus (BID 67233†) and OSVDB (106710†). bugzilla.redhat.com is providing further details. The entries VDB-68675, VDB-77162, VDB-77221 and VDB-78571 are related to this item. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Apple iOS up to 8.4.0

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
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: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Dawid Golunski
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 75373
Nessus Name: openSUSE Security Update : libxml2 / python-libxml2 (openSUSE-SU-2014:0716-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for libxml2 USN-2214-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: git.gnome.org

Timelineinfo

12/03/2013 🔍
04/22/2014 +140 days 🔍
04/22/2014 +0 days 🔍
04/24/2014 +2 days 🔍
05/06/2014 +12 days 🔍
05/07/2014 +1 days 🔍
05/07/2014 +0 days 🔍
06/13/2014 +37 days 🔍
01/21/2015 +222 days 🔍
10/30/2015 +282 days 🔍
10/30/2015 +0 days 🔍
06/19/2021 +2059 days 🔍

Sourcesinfo

Advisory: Do not fetch external parameter entities
Researcher: Daniel Veillard
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-0191 (🔍)
GCVE (CVE): GCVE-0-2014-0191
GCVE (VulDB): GCVE-100-13154

OVAL: 🔍

X-Force: 93092 - Libxml2 xmlParserHandlePEReference() denial of service, Medium Risk
SecurityFocus: 67233 - Libxml2 Entity Substituton CVE-2014-0191 Denial of Service Vulnerability
Secunia: 58018 - Libxml2 "xmlParserHandlePEReference()" Entity Expansion Denial of Service Vulner, Less Critical
OSVDB: 106710
SecurityTracker: 1030196 - Libxml2 Entity Expansion Bug Lets Remote Users Deny Service

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfo

Created: 05/07/2014 10:39
Updated: 06/19/2021 10:45
Changes: 05/07/2014 10:39 (92), 10/09/2017 09:46 (7), 06/19/2021 10:40 (3), 06/19/2021 10:45 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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