Amazon Linux AMI 2: CVE-2023-45288: Security patch for amazon-cloudwatch-agent, amazon-ecr-credential-helper, amazon-ssm-agent, cni-plugins, cri-tools, ecs-init, golang, golist, nerdctl, oci-add-hooks (Multiple Advisories)

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.