Debian DLA-2760-1 : nettle - LTS security update

high Nessus Plugin ID 153482

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Synopsis

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

Description

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2760 advisory.

- A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability. (CVE-2021-20305)

- A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext. An attacker could use this flaw to provide a manipulated ciphertext leading to application crash and denial of service. (CVE-2021-3580)

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 nettle packages.

For Debian 9 stretch, these problems have been fixed in version 3.3-1+deb9u1.

Plugin Details

Severity: High

ID: 153482

File Name: debian_DLA-2760.nasl

Version: 1.2

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 9/19/2021

Updated: 9/19/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2021-20305

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/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:nettle-bin, p-cpe:/a:debian:debian_linux:libhogweed4, cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:nettle-dev, p-cpe:/a:debian:debian_linux:libnettle6, p-cpe:/a:debian:debian_linux:nettle-dbg

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 9/18/2021

Vulnerability Publication Date: 4/5/2021

Reference Information

CVE: CVE-2021-20305, CVE-2021-3580

Detections

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