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Debian dla-3187 : dropbear - security update

high Nessus Plugin ID 167353

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Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 10 host has packages installed that are affected by a vulnerability as referenced in the dla-3187 advisory.

 [email protected] Subject: [SECURITY] [DLA 3187-1] dropbear security update

 - ----------------------------------------------------------------------- Debian LTS Advisory DLA-3187-1 [email protected] https://www.debian.org/lts/security/ Utkarsh Gupta November 14, 2022 https://wiki.debian.org/LTS
 - -----------------------------------------------------------------------

 Package : dropbear Version : 2018.76-5+deb10u2 CVE ID : CVE-2021-36369

 An issue was discovered in Dropbear, a relatively small SSH server and client. Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code, it was possible for an SSH server to change the login process in its favor. This attack can bypass additional security measures such as FIDO2 tokens or SSH-Askpass. Thus, it allows an attacker to abuse a forwarded agent for logging on to another server unnoticed.

 For Debian 10 buster, this problem has been fixed in version 2018.76-5+deb10u2.

 We recommend that you upgrade your dropbear packages.

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

 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

Solution

Upgrade the dropbear packages.

See Also

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

https://security-tracker.debian.org/tracker/CVE-2021-36369

https://packages.debian.org/source/buster/dropbear

Plugin Details

Severity: High

ID: 167353

File Name: debian_DLA-3187.nasl

Version: 1.4

Type: local

Agent: unix

Published: 11/14/2022

Updated: 1/22/2025

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2021-36369

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:dropbear, p-cpe:/a:debian:debian_linux:dropbear-initramfs, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:dropbear-bin, p-cpe:/a:debian:debian_linux:dropbear-run

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/14/2022

Vulnerability Publication Date: 10/12/2022

Reference Information

CVE: CVE-2021-36369