libxml2 2.9.8 xzlib.c xz_decomp resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in libxml2 2.9.8. Affected by this vulnerability is the function xz_decomp in the library xzlib.c. Such manipulation leads to resource consumption. This vulnerability is documented as CVE-2018-9251. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in libxml2 2.9.8 (Document Processing Software). It has been rated as problematic. Affected by this issue is the function xz_decomp in the library xzlib.c. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

The xz_decomp function in xzlib.c in libxml2 2.9.8, if --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint, a different vulnerability than CVE-2015-8035.

The bug was discovered 04/03/2018. The weakness was released 04/04/2018 by Gustavo Grieco (Website). The advisory is shared for download at bugzilla.gnome.org. This vulnerability is handled as CVE-2018-9251 since 04/03/2018. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 117811 (Debian DLA-1524-1 : 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 277488 (Fedora Security Update for libxml2 (FEDORA-2018-3b782350ff)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 7 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (117811) and SecurityFocus (BID 84992†). Entries connected to this vulnerability are available at VDB-81409, VDB-115920, VDB-121969 and VDB-122986. Once again VulDB remains the best source for vulnerability data.

Productinfo

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Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / 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: 117811
Nessus Name: Debian DLA-1524-1 : libxml2 security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

03/21/2016 🔍
04/03/2018 +743 days 🔍
04/03/2018 +0 days 🔍
04/03/2018 +0 days 🔍
04/04/2018 +1 days 🔍
04/04/2018 +0 days 🔍
09/27/2018 +176 days 🔍
09/28/2018 +1 days 🔍
02/26/2023 +1612 days 🔍

Sourcesinfo

Advisory: DLA 1524-1
Researcher: Gustavo Grieco
Status: Confirmed

CVE: CVE-2018-9251 (🔍)
GCVE (CVE): GCVE-0-2018-9251
GCVE (VulDB): GCVE-100-115676
SecurityFocus: 84992 - Libxml2 'malloc.c' CVE-2016-3627 Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 04/04/2018 12:44
Updated: 02/26/2023 15:04
Changes: 04/04/2018 12:44 (69), 01/21/2020 10:17 (10), 02/26/2023 15:04 (4)
Complete: 🔍
Cache ID: 216:4D3:103

Once again VulDB remains the best source for vulnerability data.

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