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Security Advisories: GSA_kwCzR0hTQS01anBtLXg1OHYtNjI0ds4AA6Rf
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
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.
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS01anBtLXg1OHYtNjI0ds4AA6Rf
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 1 month ago
Updated: about 1 month ago
CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Identifiers: GHSA-5jpm-x58v-624v, CVE-2024-29025
References:
- https://github.com/netty/netty/security/advisories/GHSA-5jpm-x58v-624v
- https://github.com/netty/netty/commit/0d0c6ed782d13d423586ad0c71737b2c7d02058c
- https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3
- https://github.com/vietj/netty/tree/post-request-decoder
- https://nvd.nist.gov/vuln/detail/CVE-2024-29025
- https://github.com/advisories/GHSA-5jpm-x58v-624v
Blast Radius: 20.2
Affected Packages
maven:io.netty:netty-codec-http
Dependent packages: 1,324Dependent repositories: 6,505
Downloads:
Affected Version Ranges: < 4.1.108.Final
Fixed in: 4.1.108.Final
All affected versions: 4.1.10-0.Final, 4.1.10-1.Final, 4.1.10-2.Final, 4.1.10-3.Final, 4.1.10-4.Final, 4.1.10-5.Final, 4.1.10-6.Final, 4.1.10-7.Final
All unaffected versions: