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CVE-2020-36202

CVE-2020-36202: Async-h1 request smuggling possible with long unread bodies

6.1

CVSS Score
3.1

Basic Information

CVE ID
CVE-2020-36202
GHSA ID
GHSA-c8rq-crxj-mj9m
EPSS Score
0.55695%
CWE
CWE-79
Published
5/24/2022
Updated
1/27/2023
KEV Status
No
Technology
TechnologyRust

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
async-h1rust< 2.3.02.3.0

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The RustSec advisory explicitly lists both functions in its 'Affected Functions' section for versions <2.3.0. The vulnerability stems from incomplete body consumption before processing subsequent requests, which would occur in these core request handling functions. The release notes confirm decode() had breaking changes to fix the issue, while accept() remained the primary API entrypoint. Both functions are directly involved in request processing and would be responsible for proper body consumption.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

*n issu* w*s *is*ov*r** in t** *syn*-** *r*t* ***or* *.*.* *or Rust. R*qu*st smu**lin* **n o**ur w**n us** ***in* * r*v*rs* proxy.

Reasoning

T** RustS** **visory *xpli*itly lists *ot* *un*tions in its '*****t** *un*tions' s**tion *or v*rsions <*.*.*. T** vuln*r**ility st*ms *rom in*ompl*t* *o*y *onsumption ***or* pro**ssin* su*s*qu*nt r*qu*sts, w*i** woul* o**ur in t**s* *or* r*qu*st **n*