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Ubuntu 16.04 ESM / 18.04 ESM : libx11 vulnerabilities (USN-6407-2)

high Nessus Plugin ID 182843

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 ESM / 18.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6407-2 advisory.

 - A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function.
 This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system. (CVE-2023-43785)

 - A vulnerability was found in libX11 due to an infinite loop within the PutSubImage() function. This flaw allows a local user to consume all available system resources and cause a denial of service condition.
 (CVE-2023-43786)

 - A vulnerability was found in libX11 due to an integer overflow within the XCreateImage() function. This flaw allows a local user to trigger an integer overflow and execute arbitrary code with elevated privileges. (CVE-2023-43787)

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 affected packages.

See Also

https://ubuntu.com/security/notices/USN-6407-2

Plugin Details

Severity: High

ID: 182843

File Name: ubuntu_USN-6407-2.nasl

Version: 1.3

Type: local

Agent: unix

Published: 10/10/2023

Updated: 10/16/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2023-43787

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:esm, cpe:/o:canonical:ubuntu_linux:18.04:-:esm, p-cpe:/a:canonical:ubuntu_linux:libx11-6, p-cpe:/a:canonical:ubuntu_linux:libx11-data, p-cpe:/a:canonical:ubuntu_linux:libx11-dev, p-cpe:/a:canonical:ubuntu_linux:libx11-xcb-dev, p-cpe:/a:canonical:ubuntu_linux:libx11-xcb1

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 10/10/2023

Vulnerability Publication Date: 10/4/2023

Reference Information

CVE: CVE-2023-43785, CVE-2023-43786, CVE-2023-43787

USN: 6407-2