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Medium ALAS2-2024-2556 2 CVEs

Moderate: golist security update (Amazon Linux 2)

Published May 23, 2024 · Updated May 29, 2024

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2023-45288: 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-2023-39326: A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request. Chunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small.

Fixed packages 2

ReleasePackageFixed in
Amazon Linux · 2 golist 0:0.10.1-10.amzn2.0.5
Amazon Linux · 2 golist-debuginfo 0:0.10.1-10.amzn2.0.5

Vulnerabilities 2

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2023-39326.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2023-45288.html