SB2021060905 - Remote code execution in F5 BIG-IP Nettle component 

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2021060905

SB2021060905 - Remote code execution in F5 BIG-IP Nettle component

Published: June 9, 2021

Security Bulletin ID SB2021060905
Severity
High
Patch available
NO
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2021-20305)

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

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References