@fastify/reply-from JSON Content-Type parsing confusion

CVE-2023-51701 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Impact

The main repo of fastify use fast-content-type-parse to parse request Content-Type, which will trim after split.

The fastify-reply-from have not use this repo to unify the parse of Content-Type, which won't trim.

As a result, a reverse proxy server built with @fastify/reply-from could misinterpret the incoming body by passing an header ContentType: application/json ; charset=utf-8. This can lead to bypass of security checks.

Patches

@fastify/reply-from v9.6.0 include the fix.

Workarounds

There are no known workarounds.

References

Hackerone Report: https://hackerone.com/reports/2295770.

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2024-01-08 15:22:40 UTC
Updated
2024-01-08 16:47:58 UTC
GitHub reviewed
2024-01-08 15:22:40 UTC
NVD published
2024-01-08

EPSS Score

Score Percentile
0.23% 45.50%

CVSS Scores

Base score Version Severity Vector
5.3 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-v2v2-hph8-q5xp ↗
CVE CVE-2023-51701 ↗

CWEs

CWE id Name
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Credits

  • qwerty472123 (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm @fastify/reply-from < 9.6.0 9.6.0 —

References

cvelogic Threat Intelligence