Amazon Linux 2 : libxslt (ALAS-2020-1535)

critical Nessus Plugin ID 141966

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of libxslt installed on the remote host is prior to 1.1.28-6. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1535 advisory.

libxslt through 1.1.33 allows bypass of a protection mechanism because callers of xsltCheckRead and xsltCheckWrite permit access even upon receiving a -1 error code. xsltCheckRead can return -1 for a crafted URL that is not actually invalid and is subsequently loaded. (CVE-2019-11068)

In xsltCopyText in transform.c in libxslt 1.1.33, a pointer variable isn't reset under certain circumstances. If the relevant memory area happened to be freed and reused in a certain way, a bounds check could fail and memory outside a buffer could be written to, or uninitialized data could be disclosed. (CVE-2019-18197)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'yum update libxslt' to update your system.

Plugin Details

Severity: Critical

ID: 141966

File Name: al2_ALAS-2020-1535.nasl

Version: 1.3

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/28/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2019-11068

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libxslt-debuginfo, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:libxslt-python, p-cpe:/a:amazon:linux:libxslt-devel, p-cpe:/a:amazon:linux:libxslt

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/22/2020

Vulnerability Publication Date: 4/10/2019

Reference Information

CVE: CVE-2019-11068, CVE-2019-18197

ALAS: 2020-1535

Detections

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