pysec-2023-120
Vulnerability from pysec
Impact
aiohttp v3.8.4 and earlier are bundled with llhttp v6.0.6 which is vulnerable to CVE-2023-30589. The vulnerable code is used by aiohttp for its HTTP request parser when available which is the default case when installing from a wheel.
This vulnerability only affects users of aiohttp as an HTTP server (ie aiohttp.Application
), you are not affected by this vulnerability if you are using aiohttp as an HTTP client library (ie aiohttp.ClientSession
).
Reproducer
```python from aiohttp import web
async def example(request: web.Request): headers = dict(request.headers) body = await request.content.read() return web.Response(text=f"headers: {headers} body: {body}")
app = web.Application() app.add_routes([web.post('/', example)]) web.run_app(app) ```
Sending a crafted HTTP request will cause the server to misinterpret one of the HTTP header values leading to HTTP request smuggling.
```console $ printf "POST / HTTP/1.1\r\nHost: localhost:8080\r\nX-Abc: \rxTransfer-Encoding: chunked\r\n\r\n1\r\nA\r\n0\r\n\r\n" \ | nc localhost 8080
Expected output: headers: {'Host': 'localhost:8080', 'X-Abc': '\rxTransfer-Encoding: chunked'} body: b''
Actual output (note that 'Transfer-Encoding: chunked' is an HTTP header now and body is treated differently) headers: {'Host': 'localhost:8080', 'X-Abc': '', 'Transfer-Encoding': 'chunked'} body: b'A' ```
Patches
Upgrade to the latest version of aiohttp to resolve this vulnerability. It has been fixed in v3.8.5: pip install aiohttp >= 3.8.5
Workarounds
If you aren't able to upgrade you can reinstall aiohttp using AIOHTTP_NO_EXTENSIONS=1
as an environment variable to disable the llhttp HTTP request parser implementation. The pure Python implementation isn't vulnerable to request smuggling:
console
$ python -m pip uninstall --yes aiohttp
$ AIOHTTP_NO_EXTENSIONS=1 python -m pip install --no-binary=aiohttp --no-cache aiohttp
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-30589
- https://hackerone.com/reports/2001873
{ "affected": [ { "package": { "ecosystem": "PyPI", "name": "aiohttp", "purl": "pkg:pypi/aiohttp" }, "ranges": [ { "events": [ { "introduced": "0" }, { "fixed": "3.8.5" } ], "type": "ECOSYSTEM" } ], "versions": [ "0.1", "0.10.0", "0.10.1", "0.10.2", "0.11.0", "0.12.0", "0.13.0", "0.13.1", "0.14.0", "0.14.1", "0.14.2", "0.14.3", "0.14.4", "0.15.0", "0.15.1", "0.15.2", "0.15.3", "0.16.0", "0.16.1", "0.16.2", "0.16.3", "0.16.4", "0.16.5", "0.16.6", "0.17.0", "0.17.1", "0.17.2", "0.17.3", "0.17.4", "0.18.0", "0.18.1", "0.18.2", "0.18.3", "0.18.4", "0.19.0", "0.2", "0.20.0", "0.20.1", "0.20.2", "0.21.0", "0.21.1", "0.21.2", "0.21.4", "0.21.5", "0.21.6", "0.22.0", "0.22.0a0", "0.22.0b0", "0.22.0b1", "0.22.0b2", "0.22.0b3", "0.22.0b4", "0.22.0b5", "0.22.0b6", "0.22.1", "0.22.2", "0.22.3", "0.22.4", "0.22.5", "0.3", "0.4", "0.4.1", "0.4.2", "0.4.3", "0.4.4", "0.5.0", "0.6.0", "0.6.1", "0.6.2", "0.6.3", "0.6.4", "0.6.5", "0.7.0", "0.7.1", "0.7.2", "0.7.3", "0.8.0", "0.8.1", "0.8.2", "0.8.3", "0.8.4", "0.9.0", "0.9.1", "0.9.2", "0.9.3", "1.0.0", "1.0.1", "1.0.2", "1.0.3", "1.0.5", "1.1.0", "1.1.1", "1.1.2", "1.1.3", "1.1.4", "1.1.5", "1.1.6", "1.2.0", "1.3.0", "1.3.1", "1.3.2", "1.3.3", "1.3.4", "1.3.5", "2.0.0", "2.0.0rc1", "2.0.1", "2.0.2", "2.0.3", "2.0.4", "2.0.5", "2.0.6", "2.0.7", "2.1.0", "2.2.0", "2.2.1", "2.2.2", "2.2.3", "2.2.4", "2.2.5", "2.3.0", "2.3.0a1", "2.3.0a2", "2.3.0a3", "2.3.0a4", "2.3.1", "2.3.10", "2.3.1a1", "2.3.2", "2.3.2b2", "2.3.2b3", "2.3.3", "2.3.4", "2.3.5", "2.3.6", "2.3.7", "2.3.8", "2.3.9", "3.0.0", "3.0.0b0", "3.0.0b1", "3.0.0b2", "3.0.0b3", "3.0.0b4", "3.0.1", "3.0.2", "3.0.3", "3.0.4", "3.0.5", "3.0.6", "3.0.7", "3.0.8", "3.0.9", "3.1.0", "3.1.1", "3.1.2", "3.1.3", "3.2.0", "3.2.1", "3.3.0", "3.3.0a0", "3.3.1", "3.3.2", "3.3.2a0", "3.4.0", "3.4.0a0", "3.4.0a3", "3.4.0b1", "3.4.0b2", "3.4.1", "3.4.2", "3.4.3", "3.4.4", "3.5.0", "3.5.0a1", "3.5.0b1", "3.5.0b2", "3.5.0b3", "3.5.1", "3.5.2", "3.5.3", "3.5.4", "3.6.0", "3.6.0a0", "3.6.0a1", "3.6.0a11", "3.6.0a12", "3.6.0a2", "3.6.0a3", "3.6.0a4", "3.6.0a5", "3.6.0a6", "3.6.0a7", "3.6.0a8", "3.6.0a9", "3.6.0b0", "3.6.1", "3.6.1b3", "3.6.1b4", "3.6.2", "3.6.2a0", "3.6.2a1", "3.6.2a2", "3.6.3", "3.7.0", "3.7.0b0", "3.7.0b1", "3.7.1", "3.7.2", "3.7.3", "3.7.4", "3.7.4.post0", "3.8.0", "3.8.0a7", "3.8.0b0", "3.8.1", "3.8.2", "3.8.3", "3.8.4" ] } ], "aliases": [ "GHSA-45c4-8wx5-qw6w", "CVE-2023-37276" ], "details": "### Impact\n\naiohttp v3.8.4 and earlier are [bundled with llhttp v6.0.6](https://github.com/aio-libs/aiohttp/blob/v3.8.4/.gitmodules) which is vulnerable to CVE-2023-30589. The vulnerable code is used by aiohttp for its HTTP request parser when available which is the default case when installing from a wheel.\n\nThis vulnerability only affects users of aiohttp as an HTTP server (ie `aiohttp.Application`), you are not affected by this vulnerability if you are using aiohttp as an HTTP client library (ie `aiohttp.ClientSession`).\n\n### Reproducer\n\n```python\nfrom aiohttp import web\n\nasync def example(request: web.Request):\n headers = dict(request.headers)\n body = await request.content.read()\n return web.Response(text=f\"headers: {headers} body: {body}\")\n\napp = web.Application()\napp.add_routes([web.post(\u0027/\u0027, example)])\nweb.run_app(app)\n```\n\nSending a crafted HTTP request will cause the server to misinterpret one of the HTTP header values leading to HTTP request smuggling.\n\n```console\n$ printf \"POST / HTTP/1.1\\r\\nHost: localhost:8080\\r\\nX-Abc: \\rxTransfer-Encoding: chunked\\r\\n\\r\\n1\\r\\nA\\r\\n0\\r\\n\\r\\n\" \\\n | nc localhost 8080\n\nExpected output:\n headers: {\u0027Host\u0027: \u0027localhost:8080\u0027, \u0027X-Abc\u0027: \u0027\\rxTransfer-Encoding: chunked\u0027} body: b\u0027\u0027\n\nActual output (note that \u0027Transfer-Encoding: chunked\u0027 is an HTTP header now and body is treated differently)\n headers: {\u0027Host\u0027: \u0027localhost:8080\u0027, \u0027X-Abc\u0027: \u0027\u0027, \u0027Transfer-Encoding\u0027: \u0027chunked\u0027} body: b\u0027A\u0027\n```\n\n### Patches\n\nUpgrade to the latest version of aiohttp to resolve this vulnerability. It has been fixed in v3.8.5: [`pip install aiohttp \u003e= 3.8.5`](https://pypi.org/project/aiohttp/3.8.5/)\n\n### Workarounds\n\nIf you aren\u0027t able to upgrade you can reinstall aiohttp using `AIOHTTP_NO_EXTENSIONS=1` as an environment variable to disable the llhttp HTTP request parser implementation. The pure Python implementation isn\u0027t vulnerable to request smuggling:\n\n```console\n$ python -m pip uninstall --yes aiohttp\n$ AIOHTTP_NO_EXTENSIONS=1 python -m pip install --no-binary=aiohttp --no-cache aiohttp\n```\n\n### References\n\n* https://nvd.nist.gov/vuln/detail/CVE-2023-30589\n* https://hackerone.com/reports/2001873\n", "id": "PYSEC-2023-120", "modified": "2023-07-24T14:58:05.562874+00:00", "published": "2023-07-20T14:52:00+00:00", "references": [ { "type": "ADVISORY", "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-45c4-8wx5-qw6w" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-37276" }, { "type": "PACKAGE", "url": "https://github.com/aio-libs/aiohttp" }, { "type": "WEB", "url": "https://hackerone.com/reports/2001873" } ], "summary": "aiohttp.web.Application vulnerable to HTTP request smuggling via llhttp HTTP request parser" }
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.