Xmlsoft libxml2 2.9.2 Entity Boundary memory corruption

CVSS Meta Temp Score
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6.4$0-$5k0.00

A vulnerability has been found in Xmlsoft libxml2 2.9.2 (Document Processing Software) and classified as critical. Affected by this vulnerability is an unknown functionality of the component Entity Boundary 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 confidentiality, integrity, and availability. The summary by CVE is:

The xmlParseMisc function in parser.c in libxml2 before 2.9.3 allows context-dependent attackers to cause a denial of service (out-of-bounds heap read) via unspecified vectors related to incorrect entities boundaries and start tags.

The weakness was shared 11/25/2015 by Kostya Serebryany with Google (Website). It is possible to read the advisory at git.gnome.org. This vulnerability is known as CVE-2015-7500 since 09/29/2015. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 87354 (Amazon Linux AMI : libxml2 (ALAS-2015-628)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux 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 to version 2.9.3 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 X-Force (108323), Tenable (87354), SecurityFocus (BID 79562†) and Vulnerability Center (SBV-54854†). The entries VDB-77250, VDB-79257, VDB-79258 and VDB-79334 are related to this item.

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CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
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CVSSv2info

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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Nessus ID: 87354
Nessus Name: Amazon Linux AMI : libxml2 (ALAS-2015-628)
Nessus File: 🔍
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OpenVAS ID: 703430
OpenVAS Name: Debian Security Advisory DSA 3430-1 (libxml2 - security update)
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
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Upgrade: libxml2 2.9.3
Patch: git.gnome.org

Timelineinfo

09/29/2015 🔍
11/25/2015 +57 days 🔍
11/25/2015 +0 days 🔍
11/26/2015 +1 days 🔍
12/08/2015 +12 days 🔍
12/12/2015 +4 days 🔍
12/14/2015 +2 days 🔍
12/15/2015 +1 days 🔍
12/15/2015 +0 days 🔍
06/28/2022 +2387 days 🔍

Sourcesinfo

Advisory: USN-2834-1
Researcher: Kostya Serebryany
Organization: Google
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7500 (🔍)
OVAL: 🔍

X-Force: 108323 - Libxml2 entity boundaries denial of service
SecurityFocus: 79562 - libxml2 CVE-2015-7500 Denial of Service Vulnerability
SecurityTracker: 1034243
Vulnerability Center: 54854 - Libxml2 Remote DoS due to Buffer Overflow in XmlParseMisc, Medium

See also: 🔍

Entryinfo

Created: 11/26/2015 11:50 AM
Updated: 06/28/2022 08:14 AM
Changes: 11/26/2015 11:50 AM (69), 05/11/2018 01:10 PM (15), 06/28/2022 08:10 AM (5), 06/28/2022 08:14 AM (1)
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Cache ID: 18:6B0:40

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