CVE-2021-21321 Prefix escape

2021-03-0203:35:25

CWE-20

GitHub_M

www.cve.org

10 High

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

9.4 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

60.9%

JSON

fastify-reply-from is an npm package which is a fastify plugin to forward the current http request to another server. In fastify-reply-from before version 4.0.2, 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 4.0.2.

CNA Affected

[
  {
    "product": "fastify-reply-from",
    "vendor": "fastify",
    "versions": [
      {
        "status": "affected",
        "version": "< 4.0.2"
      }
    ]
  }
]