RHEL 8 : libxml2 (RHSA-2021:2569)

high Nessus Plugin ID 151142

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Synopsis

The remote Red Hat host is missing one or more security updates for libxml2.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:2569 advisory.

The libxml2 library is a development toolbox providing the implementation of various XML standards.

Security Fix(es):

* libxml2: Use-after-free in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3516)

* libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3517)

* libxml2: Use-after-free in xmlXIncludeDoProcess() in xinclude.c (CVE-2021-3518)

* libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode (CVE-2021-3537)

* libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms (CVE-2021-3541)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL libxml2 package based on the guidance in RHSA-2021:2569.

Plugin Details

Severity: High

ID: 151142

File Name: redhat-RHSA-2021-2569.nasl

Version: 1.13

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 6/29/2021

Updated: 11/7/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-3517

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2021-3518

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:python3-libxml2, p-cpe:/a:redhat:enterprise_linux:libxml2-devel, p-cpe:/a:redhat:enterprise_linux:libxml2, cpe:/o:redhat:rhel_eus:8.4, cpe:/o:redhat:enterprise_linux:8

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/29/2021

Vulnerability Publication Date: 5/14/2021

Reference Information

CVE: CVE-2021-3516, CVE-2021-3517, CVE-2021-3518, CVE-2021-3537, CVE-2021-3541

CWE: 400, 416, 476, 787

RHSA: 2021:2569

Detections

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