Debian DSA-4377-1 : rssh - security update

high Nessus Plugin ID 121485

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Synopsis

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

Description

The ESnet security team discovered a vulnerability in rssh, a restricted shell that allows users to perform only scp, sftp, cvs, svnserve (Subversion), rdist and/or rsync operations. Missing validation in the scp support could result in the bypass of this restriction, allowing the execution of arbitrary shell commands.

Please note that with the update applied, the '-3' option of scp can no longer be used.

Solution

Upgrade the rssh packages.

For the stable distribution (stretch), this problem has been fixed in version 2.3.4-5+deb9u1.

Plugin Details

Severity: High

ID: 121485

File Name: debian_DSA-4377.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 1/31/2019

Updated: 2/20/2020

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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:rssh, 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: 1/30/2019

Vulnerability Publication Date: 2/4/2019

Reference Information

CVE: CVE-2019-1000018

DSA: 4377

Detections

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