What’s Vulnerable › Vulnerabilities

CVE-2023-45288: HTTP/2 CONTINUATION flood in net/http

Description

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.

Affected products

How to fix

Upgrade to a fixed version: Go standard library Net/Http 1.21.9, 1.22.2; Golang Http2 0.23.0; Golang.Org/X/Net 0.23.0; Golang.Org/X/Net/Http2 0.23.0; Go Net/Http 1.21.9, 1.22.2; Go Stdlib 1.21.9, 1.22.2. Check the vendor advisory for mitigations.

References

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