Vulnerability identifier: #VU16615

Vulnerability risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-19790

CWE-ID: CWE-601

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Symfony
Web applications / CMS

Vendor: SensioLabs

Description
The vulnerability allows a remote unauthenticated attacker to redirect the target user to external websites.

The weakness exists due to improper sanitization of user-supplied data. A remote attacker can use backslashes in the `_failure_path` input field of login forms, work around the redirection target restrictions and effectively redirect the user to any domain after login.

Mitigation
The vulnerability has been fixed in the versions 2.7.50, 2.8.49, 3.4.20, 4.0.15, 4.1.9 and 4.2.1.

Vulnerable software versions

Symfony: 2.7.0 - 4.2.0

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External links
http://symfony.com/blog/cve-2018-19790-open-redirect-vulnerability-when-using-security-http

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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.