Description
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called `SETTINGS_MAX_HEADER_LIST_SIZE`. When a client sends that setting to Netty, it appears that Netty will behave as follows: read the request; proxy the request to the origin; attempt to produce a response; and create an exception while writing the headers for the response. Functionally, this should be similar to the http2 reset attack, but with a different on-the-wire signature. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Problem types
CWE-770: Allocation of Resources Without Limits or Throttling
Product status
< 4.1.135.Final
References
github.com/.../netty/security/advisories/GHSA-563q-j3cm-6jxm
github.com/netty/netty/releases/tag/netty-4.1.135.Final
github.com/netty/netty/releases/tag/netty-4.2.15.Final
www.rfc-editor.org/rfc/rfc9113.html