CVE-2020-26281
async-h1 Request Smuggling Vulnerability
Description
async-h1 is an asynchronous HTTP/1.1 parser for Rust (crates.io). There is a request smuggling vulnerability in async-h1 before version 2.3.0. 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. This has been addressed in async-h1 2.3.0 and previous versions have been yanked.
INFO
Published Date :
Dec. 21, 2020, 10:15 p.m.
Last Modified :
Feb. 16, 2021, 5:16 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
4.7
Exploitability Score :
2.2
Public PoC/Exploit Available at Github
CVE-2020-26281 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-26281.
| URL | Resource |
|---|---|
| https://github.com/http-rs/async-h1/releases/tag/v2.3.0 | Release Notes Third Party Advisory |
| https://github.com/http-rs/async-h1/security/advisories/GHSA-4vr9-8cjf-vf9c | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2020-26281 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-26281 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Feb. 16, 2021
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:rust-lang:async-h1:*:*:*:*:*:*:*:* versions up to (excluding) 2.3.0 OR *cpe:2.3:a:rust-lang:async-h1:*:*:*:*:*:rust:*:* versions up to (excluding) 2.3.0 -
Initial Analysis by [email protected]
Dec. 23, 2020
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N Changed Reference Type https://github.com/http-rs/async-h1/releases/tag/v2.3.0 No Types Assigned https://github.com/http-rs/async-h1/releases/tag/v2.3.0 Release Notes, Third Party Advisory Changed Reference Type https://github.com/http-rs/async-h1/security/advisories/GHSA-4vr9-8cjf-vf9c No Types Assigned https://github.com/http-rs/async-h1/security/advisories/GHSA-4vr9-8cjf-vf9c Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:rust-lang:async-h1:*:*:*:*:*:*:*:* versions up to (excluding) 2.3.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-26281 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-26281
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.07 }} 0.01%
score
0.29324
percentile