Improper access control in SensioLabs Symfony



Published: 2015-06-02 | Updated: 2020-08-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2015-4050
CWE-ID CWE-284
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Symfony
Web applications / CMS

Vendor SensioLabs

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper access control

EUVDB-ID: #VU40728

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-4050

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Symfony: 2.3.19 - 2.6.7

External links

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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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