#VU22930 Improper control of interaction frequency in Symfony - CVE-2019-18886

Vulnerability identifier: #VU22930

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-18886

CWE-ID: CWE-799

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Symfony
Web applications / CMS

Vendor: SensioLabs

Description

The vulnerability allows a remote attacker to gain access to sensitive information on the target system.

The vulnerability exists in the "Security/Http" component due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. A remote attacker can enumerate users on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Symfony: 4.2.0 - 4.3.7

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External links
https://github.com/symfony/symfony/releases/tag/v4.3.8
https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality
https://symfony.com/blog/symfony-4-3-8-released

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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.