Headline
GHSA-5jpm-x58v-624v: Netty's HttpPostRequestDecoder can OOM
Summary
The HttpPostRequestDecoder can be tricked to accumulate data. I have spotted currently two attack vectors
Details
- While the decoder can store items on the disk if configured so, there are no limits to the number of fields the form can have, an attacher can send a chunked post consisting of many small fields that will be accumulated in the
bodyListHttpDatalist. - The decoder cumulates bytes in the
undecodedChunkbuffer until it can decode a field, this field can cumulate data without limits
PoC
Here is a Netty branch that provides a fix + tests : https://github.com/vietj/netty/tree/post-request-decoder
Here is a reproducer with Vert.x (which uses this decoder) https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3
Impact
Any Netty based HTTP server that uses the HttpPostRequestDecoder to decode a form.
Package
maven io.netty:netty-codec-http (Maven)
Affected versions
< 4.1.108.Final
Patched versions
4.1.108.Final
Description
Summary
The HttpPostRequestDecoder can be tricked to accumulate data. I have spotted currently two attack vectors
Details
- While the decoder can store items on the disk if configured so, there are no limits to the number of fields the form can have, an attacher can send a chunked post consisting of many small fields that will be accumulated in the bodyListHttpData list.
- The decoder cumulates bytes in the undecodedChunk buffer until it can decode a field, this field can cumulate data without limits
PoC
Here is a Netty branch that provides a fix + tests : https://github.com/vietj/netty/tree/post-request-decoder
Here is a reproducer with Vert.x (which uses this decoder) https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3
Impact
Any Netty based HTTP server that uses the HttpPostRequestDecoder to decode a form.
References
- GHSA-5jpm-x58v-624v
- netty/netty@0d0c6ed
- https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3
- https://github.com/vietj/netty/tree/post-request-decoder
normanmaurer published to netty/netty
Mar 25, 2024
Published to the GitHub Advisory Database
Mar 25, 2024
Reviewed
Mar 25, 2024
Last updated
Mar 25, 2024
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