CVE-2012-6431 Symfony Allows URI Restrictions Bypass Via Double-Encoded String

What is CVE-2012-6431?

CVE-2012-6431 is a medium-severity vulnerability in Sensiolabs Symfony, published on 27 Dec 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Symfony 2.0.x before 2.0.20 does not process URL encoded data consistently within the Routing and Security components, which allows remote attackers to bypass intended URI restrictions via a doubly encoded string.

Weakness: CWE-264

Which versions are affected by CVE-2012-6431?

8 open source packages ship an affected version, including symfony/http-foundation, symfony/routing and symfony/security. It affects 1 product.

Products include Sensiolabs Symfony.

How do I fix CVE-2012-6431?

Upgrade symfony/http-foundation to 2.0.19 or later.

Is CVE-2012-6431 being exploited?

There is no known exploitation of CVE-2012-6431 in the wild and no public exploit code.

Other vulnerabilities in Sensiolabs Symfony

• CVE-2019-11325 Improper Input Validation in Symfony Critical 9.8
• CVE-2017-11365 Symfony Incorrect Access Control Critical 9.8
• CVE-2019-10913 Invalid HTTP method overrides allow possible XSS or other attacks in Symfony Critical 9.8
• CVE-2018-11407 Symfony Authentication Bypass Critical 9.8
• CVE-2016-2403 Symfony Authentication Bypass Critical 9.8

All Sensiolabs Symfony vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-83c3-qx27-2rwr.