CVE-2021-21322 Prefix escape

2021-03-0203:35:17

CWE-20

GitHub_M

www.cve.org

cve-2021-21322

prefix escape

fastify-http-proxy

npm package

http requests

proxying

security vulnerability

fixed 4.3.1

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

AI Score

9.5

Confidence

High

EPSS

0.003

Percentile

70.7%

JSON

fastify-http-proxy is an npm package which is a fastify plugin for proxying your http requests to another server, with hooks. By crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is /pub/, a user expect that accessing /priv on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.3.1.

CNA Affected

[
  {
    "product": "fastify-http-proxy",
    "vendor": "fastify",
    "versions": [
      {
        "status": "affected",
        "version": "< 4.3.1"
      }
    ]
  }
]