CVE-2015-4050

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.

Category

4.3
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 76.19% Top 5%
Vendor Advisory fedoraproject.org Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory symfony.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159610.html vendor advisory
http://www.debian.org/security/2015/dsa-3276 vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159603.html vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159513.html vendor advisory
http://www.securityfocus.com/bid/74928 vdb entry

Frequently Asked Questions

What is the severity of CVE-2015-4050?
CVE-2015-4050 has been scored as a medium severity vulnerability.
How to fix CVE-2015-4050?
To fix CVE-2015-4050, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-4050 being actively exploited in the wild?
It is possible that CVE-2015-4050 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~76% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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