CVE-2018-14773 Information

Description

An issue was discovered in Http Foundation in Symfony 2.7.0 through 2.7.48 2.8.0 through 2.8.43 3.3.0 through 3.3.17 3.4.0 through 3.4.13 4.0.0 through 4.0.13 and 4.1.0 through 4.1.2. It arises from support for a (legacy) IIS header that lets users override the path in the request URL via the X-Original-URL or X-Rewrite-URL HTTP request header. These headers are designed for IIS support but it’s not verified that the server is in fact running IIS which means anybody who can send these requests to an application can trigger this. This affects \Symfony\Component\HttpFoundation\Request::prepareRequestUri() where X-Original-URL and X_REWRITE_URL are both used. The fix drops support for these methods so that they cannot be used as attack vectors such as web cache poisoning.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Reference

http://www.securityfocus.com/bid/104943 http://www.securitytracker.com/id/1041405 https://github.com/symfony/symfony/commit/e447e8b92148ddb3d1956b96638600ec95e08f6b https://lists.debian.org/debian-lts-announce/2019/03/msg00009.html https://seclists.org/bugtraq/2019/May/21 https://symfony.com/blog/cve-2018-14773-remove-support-for-legacy-and-risky-http-headers https://www.debian.org/security/2019/dsa-4441 https://www.drupal.org/SA-CORE-2018-005

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

6.5