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Amazon Linux 2 : wayland (ALAS-2023-2103)

medium Nessus Plugin ID 177882

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Synopsis

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

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2-2023-2103 advisory.

 - An internal reference count is held on the buffer pool, incremented every time a new buffer is created from the pool. The reference count is maintained as an int; on LP64 systems this can cause the reference count to overflow if the client creates a large number of wl_shm buffer objects, or if it can coerce the server to create a large number of external references to the buffer storage. With the reference count overflowing, a use-after-free can be constructed on the wl_shm_pool tracking structure, where values may be incremented or decremented; it may also be possible to construct a limited oracle to leak 4 bytes of server-side memory to the attacking client at a time. (CVE-2021-3782)

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

Solution

Run 'yum update wayland' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2023-2103.html

https://alas.aws.amazon.com/cve/html/CVE-2021-3782.html

https://alas.aws.amazon.com/faqs.html

Plugin Details

Severity: Medium

ID: 177882

File Name: al2_ALAS-2023-2103.nasl

Version: 1.1

Type: local

Agent: unix

Published: 7/1/2023

Updated: 7/6/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.5

CVSS v2

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 4.5

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

CVSS Score Source: CVE-2021-3782

CVSS v3

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libwayland-client, p-cpe:/a:amazon:linux:libwayland-cursor, p-cpe:/a:amazon:linux:libwayland-egl, p-cpe:/a:amazon:linux:libwayland-server, p-cpe:/a:amazon:linux:wayland-debuginfo, p-cpe:/a:amazon:linux:wayland-devel, p-cpe:/a:amazon:linux:wayland-doc, cpe:/o:amazon:linux:2

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/21/2023

Vulnerability Publication Date: 9/23/2022

Reference Information

CVE: CVE-2021-3782