ghsa-5jpm-x58v-624v
Vulnerability from github
Published
2024-03-25 19:40
Modified
2024-06-22 00:30
Severity ?
Summary
Netty's HttpPostRequestDecoder can OOM
Details
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.
{ "affected": [ { "package": { "ecosystem": "Maven", "name": "io.netty:netty-codec-http" }, "ranges": [ { "events": [ { "introduced": "0" }, { "fixed": "4.1.108.Final" } ], "type": "ECOSYSTEM" } ] } ], "aliases": [ "CVE-2024-29025" ], "database_specific": { "cwe_ids": [ "CWE-770" ], "github_reviewed": true, "github_reviewed_at": "2024-03-25T19:40:50Z", "nvd_published_at": "2024-03-25T20:15:08Z", "severity": "MODERATE" }, "details": "### Summary\nThe `HttpPostRequestDecoder` can be tricked to accumulate data. I have spotted currently two attack vectors \n\n### Details\n1. 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.\n2. The decoder cumulates bytes in the `undecodedChunk` buffer until it can decode a field, this field can cumulate data without limits\n\n### PoC\n\nHere is a Netty branch that provides a fix + tests : https://github.com/vietj/netty/tree/post-request-decoder\n\n\nHere is a reproducer with Vert.x (which uses this decoder) https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3\n\n### Impact\nAny Netty based HTTP server that uses the `HttpPostRequestDecoder` to decode a form.", "id": "GHSA-5jpm-x58v-624v", "modified": "2024-06-22T00:30:55Z", "published": "2024-03-25T19:40:50Z", "references": [ { "type": "WEB", "url": "https://github.com/netty/netty/security/advisories/GHSA-5jpm-x58v-624v" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-29025" }, { "type": "WEB", "url": "https://github.com/netty/netty/commit/0d0c6ed782d13d423586ad0c71737b2c7d02058c" }, { "type": "WEB", "url": "https://gist.github.com/vietj/f558b8ea81ec6505f1e9a6ca283c9ae3" }, { "type": "PACKAGE", "url": "https://github.com/netty/netty" }, { "type": "WEB", "url": "https://github.com/vietj/netty/tree/post-request-decoder" }, { "type": "WEB", "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00015.html" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "type": "CVSS_V3" } ], "summary": "Netty\u0027s HttpPostRequestDecoder can OOM" }
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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