Improper access control in Symfony - CVE-2015-4050
Published: June 2, 2015 / Updated: August 9, 2020
Vulnerability identifier: #VU40728
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-4050
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to manipulate data.
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.
Affected software
Symfony
Fedora
php-symfony
Fedora
php-symfony
How to mitigate CVE-2015-4050
Install update from vendor's website.
php-symfony - addressed in versions 2.5.12-1.el7, 2.5.12-1.fc21, 2.5.12-1.fc22
External References
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159513.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159603.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159610.html
- http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access
- http://www.debian.org/security/2015/dsa-3276
- http://www.securityfocus.com/bid/74928