Amazon Linux 2 Security Advisory: ALASECS-2024-039
Advisory Release Date: 2024-07-18 00:28 Pacific
Advisory Updated Date: 2024-07-22 13:10 Pacific
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. (CVE-2023-45288)
Affected Packages:
ecs-init
Note:
This advisory is applicable to Amazon Linux 2 - Ecs Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update ecs-init to update your system.
aarch64:
ecs-init-1.84.0-1.amzn2.aarch64
src:
ecs-init-1.84.0-1.amzn2.src
x86_64:
ecs-init-1.84.0-1.amzn2.x86_64