Debian DLA-2691-1 : libgcrypt20 - LTS security update

critical Nessus Plugin ID 151006

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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-2691 advisory.

An issue has been found in libgcrypt20, a crypto library. Mishandling of ElGamal encryption results in a possible side-channel attack and an interoperability problem with keys not generated by GnuPG/libgcrypt.
For Debian 9 stretch, this problem has been fixed in version 1.7.6-2+deb9u4. We recommend that you upgrade your libgcrypt20 packages. For the detailed security status of libgcrypt20 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/libgcrypt20 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 libgcrypt20 packages.

For Debian 9 stretch, this problem has been fixed in version 1.7.6-2+deb9u4.

Plugin Details

Severity: Critical

ID: 151006

File Name: debian_DLA-2691.nasl

Version: 1.9

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 6/25/2021

Updated: 1/24/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 2

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

CVSS Score Source: CVE-2021-40528

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.3

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libgcrypt20, cpe:/o:debian:debian_linux:9.0

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: 6/24/2021

Vulnerability Publication Date: 6/8/2021

Reference Information

CVE: CVE-2021-40528

Detections

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