Support for legacy HTTP methods in Symfony - CVE-2018-14773
Published: August 1, 2018
Vulnerability identifier: #VU14165
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-14773
CWE-ID: CWE-749
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: SensioLabs
Affected software:
Symfony
Symfony
Detailed vulnerability 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.
How to mitigate CVE-2018-14773
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.