Important: openssl11

Issue Overview:

A flaw was found in openssl. A server crash and denial of service attack could occur if a client sends a TLSv1.2 renegotiation ClientHello and omits the signature_algorithms extension but includes a signature_algorithms_cert extension. The highest threat from this vulnerability is to system availability. (CVE-2021-3449)

A flaw was found in openssl. The flag that enables additional security checks of certificates present in a certificate chain was not enabled allowing a confirmation step to verify that certificates in the chain are valid CA certificates is bypassed. The highest threat from this vulnerability is to data confidentiality and integrity. (CVE-2021-3450)

Affected Packages:

openssl11

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 openssl11 to update your system.

New Packages:

aarch64:  
    openssl11-1.1.1g-12.amzn2.0.3.aarch64  
    openssl11-libs-1.1.1g-12.amzn2.0.3.aarch64  
    openssl11-devel-1.1.1g-12.amzn2.0.3.aarch64  
    openssl11-static-1.1.1g-12.amzn2.0.3.aarch64  
    openssl11-debuginfo-1.1.1g-12.amzn2.0.3.aarch64  
  
i686:  
    openssl11-1.1.1g-12.amzn2.0.3.i686  
    openssl11-libs-1.1.1g-12.amzn2.0.3.i686  
    openssl11-devel-1.1.1g-12.amzn2.0.3.i686  
    openssl11-static-1.1.1g-12.amzn2.0.3.i686  
    openssl11-debuginfo-1.1.1g-12.amzn2.0.3.i686  
  
src:  
    openssl11-1.1.1g-12.amzn2.0.3.src  
  
x86_64:  
    openssl11-1.1.1g-12.amzn2.0.3.x86_64  
    openssl11-libs-1.1.1g-12.amzn2.0.3.x86_64  
    openssl11-devel-1.1.1g-12.amzn2.0.3.x86_64  
    openssl11-static-1.1.1g-12.amzn2.0.3.x86_64  
    openssl11-debuginfo-1.1.1g-12.amzn2.0.3.x86_64  

Additional References

Red Hat: CVE-2021-3449, CVE-2021-3450

Mitre: CVE-2021-3449, CVE-2021-3450