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AlmaLinux 8 : freerdp (ALSA-2021:4622)

high Nessus Plugin ID 157567

Synopsis

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

Description

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:4622 advisory.

 - FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license.
 All FreeRDP clients prior to version 2.4.1 using gateway connections (`/gt:rpc`) fail to validate input data. A malicious gateway might allow client memory to be written out of bounds. This issue has been resolved in version 2.4.1. If you are unable to update then use `/gt:http` rather than /gt:rdp connections if possible or use a direct connection without a gateway. (CVE-2021-41159)

 - FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license.
 In affected versions a malicious server might trigger out of bound writes in a connected client.
 Connections using GDI or SurfaceCommands to send graphics updates to the client might send `0` width/height or out of bound rectangles to trigger out of bound writes. With `0` width or heigth the memory allocation will be `0` but the missing bounds checks allow writing to the pointer at this (not allocated) region. This issue has been patched in FreeRDP 2.4.1. (CVE-2021-41160)

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

Solution

Update the affected packages.

See Also

https://errata.almalinux.org/8/ALSA-2021-4622.html

Plugin Details

Severity: High

ID: 157567

File Name: alma_linux_ALSA-2021-4622.nasl

Version: 1.3

Type: local

Published: 2/9/2022

Updated: 2/14/2022

Supported Sensors: Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2021-41160

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:alma:linux:freerdp-devel, p-cpe:/a:alma:linux:libwinpr-devel, p-cpe:/a:alma:linux:libwinpr, cpe:/o:alma:linux:8, p-cpe:/a:alma:linux:freerdp, p-cpe:/a:alma:linux:freerdp-libs

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/11/2021

Vulnerability Publication Date: 10/21/2021

Reference Information

CVE: CVE-2021-41159, CVE-2021-41160