Debian DLA-2755-1 : btrbk - LTS security update

critical Nessus Plugin ID 153026

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Synopsis

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

Description

The remote Debian 9 host has a package installed that is affected by a vulnerability as referenced in the dla-2755 advisory.

An issue has been found in btrbk, a backup tool for btrfs subvolumes. Due to mishandling of remote hosts filtering SSH commands using ssh_filter_btrbk.sh in authorized_keys an arbitrary code execution would have been allowed. For Debian 9 stretch, this problem has been fixed in version 0.24.0-1+deb9u1. We recommend that you upgrade your btrbk packages. For the detailed security status of btrbk please refer to its security tracker page at: https://security-tracker.debian.org/tracker/btrbk 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 btrbk packages.

For Debian 9 stretch, this problem has been fixed in version 0.24.0-1+deb9u1.

Plugin Details

Severity: Critical

ID: 153026

File Name: debian_DLA-2755.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 9/6/2021

Updated: 1/24/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2021-38173

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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:U/RL:O/RC:C

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/5/2021

Vulnerability Publication Date: 8/7/2021

Reference Information

CVE: CVE-2021-38173

Detections

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