CVE-2020-15233 OAuth2 Redirect URL validity does not respect query parameters and character casing for loopback addresses

2020-10-0220:40:17

CWE-601

CWE-20

GitHub_M

www.cve.org

oauth2

redirect url

ory fosite

vulnerability

loopback addresses

patched

CVSS3

6.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

19.4%

JSON

ORY Fosite is a security first OAuth2 & OpenID Connect framework for Go. In Fosite from version 0.30.2 and before version 0.34.1, there is an issue in which an an attacker can override the registered redirect URL by performing an OAuth flow and requesting a redirect URL that is to the loopback adapter. Attackers can provide both custom URL query parameters to their loopback redirect URL, as well as actually overriding the host of the registered redirect URL. These attacks are only applicable in scenarios where the attacker has access over the loopback interface. This vulnerability has been patched in ORY Fosite v0.34.1.

CNA Affected

[
  {
    "product": "fosite",
    "vendor": "ory",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.34.1"
      }
    ]
  }
]