CVE-2019-3877 - URL Redirection to Untrusted Site ('Open Redirect') vulnerability in multiple products

Publication

2019-03-27

Last modification

2019-04-16

Summary

A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.

Description

Uninett mod_auth_mellon Module is prone to an open-redirection vulnerability. An attacker can leverage this issue by constructing a crafted URI and enticing a user to follow it. When an unsuspecting victim follows the link, they may be redirected to an attacker-controlled site; this may aid in phishing attacks or gain sensitive information. Other attacks are possible.

Solution

Updates are available. Please see the references or vendor advisory for more information.

Exploit

Currently, we are not aware of any working exploits.

Classification

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Risk level (CVSS AV:N/AC:M/Au:N/C:N/I:P/A:N)

Medium

4.3

Access Vector

  • Network
  • Adjacent Network
  • Local

Access Complexity

  • Low
  • Medium
  • High

Authentication

  • None
  • Single
  • Multiple

Confident. Impact

  • Complete
  • Partial
  • None

Integrity Impact

  • Complete
  • Partial
  • None

Affected Products