CVE-2024-42353 WebOb's location header normalization during redirect leads to open redirect

2024-08-1420:12:30

CWE-601

GitHub_M

github.com

webob

http requests

open redirect

python urlparse

url parsing

urljoin

vulnerability

patch

version 1.8.8

CVSS3

6.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

AI Score

7.1

Confidence

Low

EPSS

0.001

Percentile

17.7%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

WebOb provides objects for HTTP requests and responses. When WebOb normalizes the HTTP Location header to include the request hostname, it does so by parsing the URL that the user is to be redirected to with Python’s urlparse, and joining it to the base URL. urlparse however treats a // at the start of a string as a URI without a scheme, and then treats the next part as the hostname. urljoin will then use that hostname from the second part as the hostname replacing the original one from the request. This vulnerability is patched in WebOb version 1.8.8.

CNA Affected

[
  {
    "vendor": "Pylons",
    "product": "webob",
    "versions": [
      {
        "version": "<= 1.8.7",
        "status": "affected"
      }
    ]
  }
]