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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2023-45288

HTTP/2 CONTINUATION flood in net/http

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Status
Published
Published
Updated
Assigning organization
Go

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Go standard library net/http

Default version status: unaffected

  • 0 to < 1.21.9affected
  • 1.22.0-0 to < 1.22.2affected

golang.org/x/net golang.org/x/net/http2

Default version status: unaffected

  • 0 to < 0.23.0affected

References