#VU52195 Use of a broken or risky cryptographic algorithm - CVE-2021-20305
Published: April 6, 2021 / Updated: April 13, 2021
Vulnerability identifier: #VU52195
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2021-20305
CWE-ID: CWE-327
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Software vendor:
Description
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
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.
Remediation
Install update from vendor's website.