Debian dla-3559 : libssh2-1 - security update

high Nessus Plugin ID 181187

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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-3559 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-3559-1 [email protected] https://www.debian.org/lts/security/ Guilhem Moulin September 08, 2023 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : libssh2 Version : 1.8.0-2.1+deb10u1 CVE ID : CVE-2019-13115 CVE-2019-17498 CVE-2020-22218 Debian Bug : 932329 943562

Vulnerabilities were found in libssh2, a client-side C library implementing the SSH2 protocol, which could lead to denial of service or remote information disclosure.

CVE-2019-13115

Kevin Backhouse discovered an integer overflow vulnerability in kex.c's kex_method_diffie_hellman_group_exchange_sha256_key_exchange() function, which could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises an SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

CVE-2019-17498

Kevin Backhouse discovered that the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, thereby enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A malicious SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

CVE-2020-22218

An issue was discovered in function _libssh2_packet_add(), which could allow attackers to access out of bounds memory.

For Debian 10 buster, these problems have been fixed in version 1.8.0-2.1+deb10u1.

We recommend that you upgrade your libssh2 packages.

For the detailed security status of libssh2 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libssh2

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 Attachment:
signature.asc Description: PGP signature

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 libssh2-1 packages.

Plugin Details

Severity: High

ID: 181187

File Name: debian_DLA-3559.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 9/8/2023

Updated: 1/22/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.5

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

CVSS Score Source: CVE-2019-17498

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:N/A:H

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libssh2-1-dev, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:libssh2-1

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: 9/8/2023

Vulnerability Publication Date: 7/16/2019

Reference Information

CVE: CVE-2019-13115, CVE-2019-17498, CVE-2020-22218

Detections

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