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CVE-2015-4050

4.3 · MEDIUM

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 i…

Published Jun 2, 2015sensiolabsCWE-284EPSS 8.21%

Overview

CVE-2015-4050 is a medium-severity vulnerability affecting sensiolabs symfony. It was published on June 2, 2015 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from sensiolabs. Update symfony to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Reflists.fedoraproject.org/pipermail/package-announce/2015-June/159513.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-June/159603.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-June/159610.htmlRefsymfony.com/blog/cve-2015-4050-esi-unauthorized-accessRefwww.debian.org/security/2015/dsa-3276Refwww.securityfocus.com/bid/74928Reflists.fedoraproject.org/pipermail/package-announce/2015-June/159513.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-June/159603.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-June/159610.htmlRefsymfony.com/blog/cve-2015-4050-esi-unauthorized-access

How CyberStrike helps

Frequently asked questions

What is CVE-2015-4050?

CVE-2015-4050 is a medium-severity vulnerability affecting sensiolabs symfony. It was published on June 2, 2015 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

How severe is CVE-2015-4050?

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-4050?

Check the references section for vendor advisories and patches from sensiolabs. Update symfony to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-4050?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-4050 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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