#VU58791 Open redirect in showdoc - CVE-2021-4000

Vulnerability identifier: #VU58791

Vulnerability risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2021-4000

CWE-ID: CWE-601

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
showdoc
Web applications / Modules and components for CMS

Vendor: star7th

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data in the "redirect" parameter on the login page. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation
Install update from vendor's website.

Vulnerable software versions

showdoc: 1.0.0 - 2.9.13

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External links
https://huntr.dev/bounties/e4d803e0-3104-432c-80b3-34bc453c8962
https://github.com/star7th/showdoc/commit/c7f10033eba5f2b5a537f9af9ba2379138e67138

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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. However, proof of concept for this vulnerability is available.