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Use of a Broken or Risky Cryptographic Algorithm Affecting nettle package, versions <3.6-2ubuntu0.1

medium

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.96% (84th percentile)
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NVD
8.1 high
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SUSE
8.1 high
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Red Hat
8.1 high

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  • Snyk ID SNYK-UBUNTU2010-NETTLE-1090730
  • published 7 Apr 2021
  • disclosed 5 Apr 2021
Report a new vulnerability Found a mistake?

Introduced: 5 Apr 2021

CVE-2021-20305 Open this link in a new tab
CWE-327 Open this link in a new tab

How to fix?

Upgrade Ubuntu:20.10 nettle to version 3.6-2ubuntu0.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nettle package and not the nettle package as distributed by Ubuntu. See How to fix? for Ubuntu:20.10 relevant fixed versions and status.

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.