Libxml2 CVE-2019-19956

HIGH

Memory Leak (CWE-401)

2019-12-24 cve@mitre.org

Information Disclosure Debian Oracle Siemens Canonical Active Iq Unified Manager Debian Linux Fedora Libxml2 Ubuntu Linux Ontap Select Deploy Administration Utility Manageability Software Development Kit Clustered Data Ontap Clustered Data Ontap Antivirus Connector Steelstore Cloud Integrated Storage Sinema Remote Connect Server Real User Experience Insight Netapp Xmlsoft Fedoraproject

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-401 ASVS 5.0 V15 - Secure Coding and Architecture Resource cleanup, leak prevention
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could exhaust available memory leading to denial of service by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 5.5% exploitation probability (EPSS)

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AnalysisAI

xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Ensure all allocated memory is properly freed. Use RAII patterns or garbage-collected languages.

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Technical ContextAI · show details

This vulnerability is classified as Memory Leak (CWE-401), which allows attackers to exhaust available memory leading to denial of service. xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs. Affected products include: Xmlsoft Libxml2, Debian Debian Linux, Oracle Real User Experience Insight, Fedoraproject Fedora, Canonical Ubuntu Linux. Version information: before 2.9.10.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs.

Threat Intelligence Overview

EPSS Score

5.5%

Top 8% exploitable

Data Quality

3 sources

Confidence: Low

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 5.5%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

44

Low Medium High Critical

KEV: 0

EPSS: +6

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:real_user_experience_insight:13.3.1.0:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*

cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*

cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*

cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:*

cpe:2.3:a:netapp:manageability_software_development_kit:-:*:*:*:*:*:*:*

cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*

cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*

cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://gitlab.gnome.org/GNOME/libxml2/commit/5a02583c7e683896d84878bd90641d8d9b0d0549 REF http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00047.html REF http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00005.html REF https://cert-portal.siemens.com/productcert/html/ssa-292794.html REF https://cert-portal.siemens.com/productcert/html/ssa-398330.html REF https://cert-portal.siemens.com/productcert/pdf/ssa-292794.pdf REF https://lists.debian.org/debian-lts-announce/2019/12/msg00032.html REF https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R55ZR52RMBX24TQTWHCIWKJVRV6YAWI/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JDPF3AAVKUAKDYFMFKSIQSVVS3EEFPQH/ REF https://security.netapp.com/advisory/ntap-20200114-0002/ REF https://us-cert.cisa.gov/ics/advisories/icsa-21-103-08 REF https://usn.ubuntu.com/4274-1/ REF https://www.oracle.com/security-alerts/cpujul2020.html

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