Debian DSA-4965-1 : libssh - security update

medium Nessus Plugin ID 152967

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Synopsis

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

Description

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-4965 advisory.

It was discovered that a buffer overflow in rekeying in libssh could result in denial of service or potentially the execution of arbitrary code. The oldstable distribution (buster) is not affected. For the stable distribution (bullseye), this problem has been fixed in version 0.9.5-1+deb11u1. We recommend that you upgrade your libssh packages. For the detailed security status of libssh please refer to its security tracker page at: https://security-tracker.debian.org/tracker/libssh

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 libssh packages.

For the stable distribution (bullseye), this problem has been fixed in version 0.9.5-1+deb11u1.

Plugin Details

Severity: Medium

ID: 152967

File Name: debian_DSA-4965.nasl

Version: 1.6

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 9/2/2021

Updated: 1/24/2025

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2021-3634

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:libssh-gcrypt-4, p-cpe:/a:debian:debian_linux:libssh-doc, p-cpe:/a:debian:debian_linux:libssh-gcrypt-dev, p-cpe:/a:debian:debian_linux:libssh-dev, p-cpe:/a:debian:debian_linux:libssh-4

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/31/2021

Vulnerability Publication Date: 8/31/2021

Reference Information

CVE: CVE-2021-3634

IAVA: 2022-A-0041-S

Detections

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