Vulnerability identifier: #VU15970

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-2018-16471

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

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

Vendor: Rack

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient escaping of the content returned by the scheme method in the Rack::Request class. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
The vulnerability has been fixed in the versions 1.6.11, 2.0.6.

Vulnerable software versions

Rack: 2.0 - 2.0.5, 1.6 - 1.6.10, 1.5 - 1.5.5, 1.4 - 1.4.7, 1.3 - 1.3.10, 1.2 - 1.2.8, 1.1 - 1.1.6, 1.0 - 1.0.1, 0.9 - 0.9.1

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External links
http://groups.google.com/forum/#!topic/rubyonrails-security/GKsAFT924Ag

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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.