HTTP Header Injection

Severity: Medium

Invicti identified a CRLF (new line) HTTP header injection.

This means the input goes into HTTP headers without proper input filtering.

Depending on the application, an attacker might carry out the following types of attacks:
  • Cross-site scripting attack, which can lead to session hijacking
  • Session fixation attack by setting a new cookie, which can also lead to session hijacking
Actions To Take#
  1. See the remedy for solution.
  2. Ensure the server security patches are up to date and that the current stable version of the software is in use.
Do not allow newline characters in input. Where possible, use strict whitelisting.
Required Skills for Successful Exploitation#
Crafting the attack to exploit this issue is not a complex process. However, most unsophisticated attackers will not know that such an attack is possible. Also, an attacker needs to reach his victim by e-mail or other similar method in order to entice them to visit the site or click on a URL.
Further Reading#

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