CVE-2020-26281 – async-h1

Package

Manager: cargo
Name: async-h1
Vulnerable Version: >=0 <2.3.0

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

EPSS: 0.00296 pctl0.52411

Details

Async-h1 request smuggling possible with long unread bodies ### Impact 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](https://github.com/http-rs/async-h1) * Contact a core team member on [zulip](https://http-rs.zulip-chat.com) or [discord](https://discord.gg/x2gKzst)

Metadata

Created: 2021-10-12T16:00:37Z
Modified: 2021-10-08T22:14:28Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/10/GHSA-4vr9-8cjf-vf9c/GHSA-4vr9-8cjf-vf9c.json
CWE IDs: ["CWE-444"]
Alternative ID: GHSA-4vr9-8cjf-vf9c
Finding: F110
Auto approve: 1