CVE-2015-4050 Symfony Incorrect Access Control

What is CVE-2015-4050?

CVE-2015-4050 is a medium-severity vulnerability in Sensiolabs Symfony, published on 2 Jun 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through 2.6.7, when ESI or SSI support enabled, does not check if the _controller attribute is set, which allows remote attackers to bypass URL signing and security rules by including (1) no hash or (2) an invalid hash in a request to /_fragment.

Weakness: CWE-284

Which versions are affected by CVE-2015-4050?

16 open source packages ship an affected version, including symfony/http-kernel and symfony/symfony. It affects 1 product.

Products include Sensiolabs Symfony.

How do I fix CVE-2015-4050?

Upgrade symfony/http-kernel to a fixed version for your release line: 2.3.29, 2.5.12 or 2.6.8.

Is CVE-2015-4050 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-4050 exists.

Public exploit code: 1 Nuclei template.

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 DEBIAN-CVE-2015-4050, DSA-3276-1, GHSA-qmqw-mpqp-mr54.