Important: nettle

Issue Overview:

A flaw was found in Nettle, 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)

Affected Packages:

nettle

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update nettle to update your system.

New Packages:

aarch64:  
    nettle-2.7.1-9.amzn2.aarch64  
    nettle-devel-2.7.1-9.amzn2.aarch64  
    nettle-debuginfo-2.7.1-9.amzn2.aarch64  
  
i686:  
    nettle-2.7.1-9.amzn2.i686  
    nettle-devel-2.7.1-9.amzn2.i686  
    nettle-debuginfo-2.7.1-9.amzn2.i686  
  
src:  
    nettle-2.7.1-9.amzn2.src  
  
x86_64:  
    nettle-2.7.1-9.amzn2.x86_64  
    nettle-devel-2.7.1-9.amzn2.x86_64  
    nettle-debuginfo-2.7.1-9.amzn2.x86_64  

Additional References

Red Hat: CVE-2021-20305

Mitre: CVE-2021-20305