Security restrictions bypass in Symfony

1) Support for legacy HTTP methods

EUVDB-ID: #VU14165

Risk: Low

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-14773

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to Symfony HttpFoundation component includes support for legacy Microsoft IIS headers X-Original-URL and X-Rewrite-URL. A remote attacker can send a specially crafted HTTP request to the vulnerable application requesting one URL but have Symphony return a different one. An attacker can abuse X-Original-URL and X-Rewrite-URL headers to access otherwise restricted functionality and bypass restrictions on higher level caches and web servers.

Mitigation

The vulnerability is fixed in Symfony 2.7.49, 2.8.44, 3.3.18, 3.4.14, 4.0.14, and 4.1.3.

Vulnerable software versions

Symfony: 2.7.0 - 4.1.2

External links

http://symfony.com/blog/cve-2018-14773-remove-support-for-legacy-and-risky-http-headers

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.