Debian dla-3794 : pterm - security update

critical Nessus Plugin ID 193899

Language:

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3794 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-3794-1 [email protected] https://www.debian.org/lts/security/ Bastien Roucaris April 25, 2024 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : putty Version : 0.74-1+deb11u1~deb10u1 CVE ID : CVE-2019-17069 CVE-2020-14002 CVE-2021-36367 CVE-2023-48795 Debian Bug : 990901

Putty, a Telnet/SSH client for X, was vulnerable.

CVE-2019-17069

PuTTY allowed remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONNECT message.

CVE-2020-14002

PuTTY had an Observable Discrepancy leading to an information leak in the algorithm negotiation.
This allowed man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).

CVE-2021-36367

PuTTY proceeded with establishing an SSH session even if it has never sent a substantive authentication response.
This made it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).

CVE-2023-48795

PuTTY was vulnerable to Terrapin attack. The SSH transport protocol with certain OpenSSH extensions, allowed remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305 and (if CBC is used) the -etm MAC algorithms.

For Debian 10 buster, this problem has been fixed in version 0.74-1+deb11u1~deb10u1.

We recommend that you upgrade your putty packages.

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

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 these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the pterm packages.

Plugin Details

Severity: Critical

ID: 193899

File Name: debian_DLA-3794.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 4/25/2024

Updated: 1/22/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.1

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.5

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

CVSS Score Source: CVE-2021-36367

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2023-48795

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:putty-tools, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:putty, p-cpe:/a:debian:debian_linux:pterm, p-cpe:/a:debian:debian_linux:putty-doc

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: 4/25/2024

Vulnerability Publication Date: 10/1/2019

Reference Information

CVE: CVE-2019-17069, CVE-2020-14002, CVE-2021-36367, CVE-2023-48795

Detections

Analytics