Amazon Linux AMI Security Advisory: ALAS-2021-1541
Advisory Release Date: 2021-10-01 18:00 Pacific
Advisory Updated Date: 2021-10-04 22:13 Pacific
It was found that openssl assumed ASN.1 strings to be NUL terminated. A malicious actor may be able to force an application into calling openssl function with a specially crafted, non-NUL terminated string to deliberately hit this bug, which may result in a crash of the application, causing a Denial of Service attack, or possibly, memory disclosure. The highest threat from this vulnerability is to data confidentiality and system availability. (CVE-2021-3712)
Run yum update openssl to update your system.