GLSA-202210-13 : libgcrypt: Multiple Vulnerabilities

high Nessus Plugin ID 166722

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Description

The remote host is affected by the vulnerability described in GLSA-202210-13 (libgcrypt: Multiple Vulnerabilities)

- Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP. (CVE-2021-33560)

- The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP. (CVE-2021-40528)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

All libgcrypt users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose >=dev-libs/libgcrypt-1.9.4

Plugin Details

Severity: High

ID: 166722

File Name: gentoo_GLSA-202210-13.nasl

Version: 1.3

Type: local

Family: Gentoo Local Security Checks

Published: 10/31/2022

Updated: 10/6/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.1

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

CVSS Score Source: CVE-2021-33560

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7

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

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

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:libgcrypt, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/31/2022

Vulnerability Publication Date: 6/8/2021

Reference Information

CVE: CVE-2021-33560, CVE-2021-40528

Detections

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