GHSA-4VR9-8CJF-VF9C
Vulnerability from github – Published: 2021-10-12 16:00 – Updated: 2021-10-08 22:14Impact
This vulnerability affects any webserver that uses async-h1 behind a reverse proxy, including all such Tide applications.
If the server does not read the body of a request which is longer than some buffer length, async-h1 will attempt to read a subsequent request from the body content starting at that offset into the body.
One way to exploit this vulnerability would be for an adversary to craft a request such that the body contains a request that would not be noticed by a reverse proxy, allowing it to forge forwarded/x-forwarded headers. If an application trusted the authenticity of these headers, it could be misled by the smuggled request.
Another potential concern with this vulnerability is that if a reverse proxy is sending multiple http clients' requests along the same keep-alive connection, it would be possible for the smuggled request to specify a long content and capture another user's request in its body. This content could be captured in a post request to an endpoint that allows the content to be subsequently retrieved by the adversary.
Patches
This has been addressed in async-h1 2.3.0 and previous versions have been yanked.
Workarounds
none
References
https://github.com/http-rs/async-h1/releases/tag/v2.3.0
For more information
If you have any questions or comments about this advisory: * Open an issue in async-h1 * Contact a core team member on zulip or discord
{
"affected": [
{
"package": {
"ecosystem": "crates.io",
"name": "async-h1"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-26281"
],
"database_specific": {
"cwe_ids": [
"CWE-444"
],
"github_reviewed": true,
"github_reviewed_at": "2021-10-08T22:14:28Z",
"nvd_published_at": "2020-12-21T22:15:00Z",
"severity": "MODERATE"
},
"details": "### Impact\nThis vulnerability affects any webserver that uses async-h1 behind a reverse proxy, including all such Tide applications.\n\nIf the server does not read the body of a request which is longer than some buffer length, async-h1 will attempt to read a subsequent request from the body content starting at that offset into the body.\n\nOne way to exploit this vulnerability would be for an adversary to craft a request such that the body contains a request that would not be noticed by a reverse proxy, allowing it to forge forwarded/x-forwarded headers. If an application trusted the authenticity of these headers, it could be misled by the smuggled request.\n\nAnother potential concern with this vulnerability is that if a reverse proxy is sending multiple http clients\u0027 requests along the same keep-alive connection, it would be possible for the smuggled request to specify a long content and capture another user\u0027s request in its body. This content could be captured in a post request to an endpoint that allows the content to be subsequently retrieved by the adversary.\n\n\n### Patches\nThis has been addressed in async-h1 2.3.0 and previous versions have been yanked.\n\n### Workarounds\nnone\n\n### References\nhttps://github.com/http-rs/async-h1/releases/tag/v2.3.0\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [async-h1](https://github.com/http-rs/async-h1)\n* Contact a core team member on [zulip](https://http-rs.zulip-chat.com) or [discord](https://discord.gg/x2gKzst)",
"id": "GHSA-4vr9-8cjf-vf9c",
"modified": "2021-10-08T22:14:28Z",
"published": "2021-10-12T16:00:37Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/http-rs/async-h1/security/advisories/GHSA-4vr9-8cjf-vf9c"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26281"
},
{
"type": "PACKAGE",
"url": "https://github.com/http-rs/async-h1"
},
{
"type": "WEB",
"url": "https://github.com/http-rs/async-h1/releases/tag/v2.3.0"
},
{
"type": "WEB",
"url": "https://rustsec.org/advisories/RUSTSEC-2020-0093.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "Async-h1 request smuggling possible with long unread bodies"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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