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Debian DLA-2570-1 : screen security update

critical Nessus Plugin ID 146699

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Synopsis

The remote Debian host is missing a security update.

Description

encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.

For Debian 9 stretch, this problem has been fixed in version 4.5.0-6+deb9u1.

We recommend that you upgrade your screen packages.

For the detailed security status of screen please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/screen

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected screen, and screen-udeb packages.

See Also

https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html

https://packages.debian.org/source/stretch/screen

https://security-tracker.debian.org/tracker/source-package/screen

Plugin Details

Severity: Critical

ID: 146699

File Name: debian_DLA-2570.nasl

Version: 1.3

Type: local

Agent: unix

Published: 2/22/2021

Updated: 1/19/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

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-2021-26937

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:screen, p-cpe:/a:debian:debian_linux:screen-udeb, cpe:/o:debian:debian_linux:9.0

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/19/2021

Vulnerability Publication Date: 2/9/2021

Reference Information

CVE: CVE-2021-26937