libxml2 XML Data parser.c xmlParseConditionalSections memory corruption

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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in libxml2 and classified as problematic. This vulnerability affects the function xmlParseConditionalSections of the file parser.c of the component XML Data Handler. Executing a manipulation can lead to memory corruption. This vulnerability appears as CVE-2015-7942. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in libxml2 (Document Processing Software) (the affected version is unknown) and classified as problematic. This vulnerability affects the function xmlParseConditionalSections of the file parser.c of the component XML Data Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability. CVE summarizes:

The xmlParseConditionalSections function in parser.c in libxml2 does not properly skip intermediary entities when it stops parsing invalid input, which allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via crafted XML data, a different vulnerability than CVE-2015-7941.

The weakness was presented 11/18/2015 by Kostya Serebryany as Bug 756456 as confirmed bug report (Bugzilla). The advisory is available at bugzilla.gnome.org. This vulnerability was named CVE-2015-7942 since 10/22/2015. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 87000 (FreeBSD : libxml2 -- multiple vulnerabilities (e5423caf-8fb8-11e5-918c-bcaec565249c)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351588 (Amazon Linux Security Advisory for libxml2: ALAS2-2019-1220).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (87000), SecurityFocus (BID 79507†) and Vulnerability Center (SBV-56779†). See VDB-77250, VDB-79052, VDB-79257 and VDB-79334 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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Name

License

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

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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: 87000
Nessus Name: FreeBSD : libxml2 -- multiple vulnerabilities (e5423caf-8fb8-11e5-918c-bcaec565249c)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703430
OpenVAS Name: Debian Security Advisory DSA 3430-1 (libxml2 - security update)
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: 🔍
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Timelineinfo

10/22/2015 🔍
10/22/2015 +0 days 🔍
10/22/2015 +0 days 🔍
11/18/2015 +27 days 🔍
11/18/2015 +0 days 🔍
11/19/2015 +1 days 🔍
11/19/2015 +0 days 🔍
11/22/2015 +3 days 🔍
02/27/2016 +97 days 🔍
06/27/2022 +2311 days 🔍

Sourcesinfo

Advisory: Bug 756456
Researcher: Kostya Serebryany
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7942 (🔍)
GCVE (CVE): GCVE-0-2015-7942
GCVE (VulDB): GCVE-100-79258

OVAL: 🔍

SecurityFocus: 79507 - Libxml2 'xmlParseConditionalSections()' Function Denial of Service Vulnerability
SecurityTracker: 1034243
Vulnerability Center: 56779 - Libxml2 Remote DoS or Code Execution via Crafted XML Data due to Out-of-Bounds Read - CVE-2015-7942, Medium

See also: 🔍

Entryinfo

Created: 11/19/2015 10:29
Updated: 06/27/2022 15:03
Changes: 11/19/2015 10:29 (72), 08/23/2018 08:34 (8), 06/27/2022 15:03 (3)
Complete: 🔍
Cache ID: 216::103

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