Cross-site scripting in Rack - CVE-2018-16471
Published: November 19, 2018 / Updated: November 20, 2018
Vulnerability identifier: #VU15970
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2018-16471
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Rack
ruby-rack (Ubuntu package)
rubygem-rack
Opensuse
Fedora
ruby-rack (Ubuntu package)
rubygem-rack
Opensuse
Fedora
How to mitigate CVE-2018-16471
The vulnerability has been fixed in the versions 1.6.11, 2.0.6.
Rack - addressed in versions 1.6.11, 2.0.6
ruby-rack (Ubuntu package) - addressed in versions 1.6.4-3ubuntu0.1, 1.6.4-4ubuntu0.1
rubygem-rack - addressed in versions 2.0.3-4.fc27, 2.0.4-4.fc28, 2.0.4-4.fc29
ruby-rack (Ubuntu package) - addressed in versions 1.6.4-3ubuntu0.1, 1.6.4-4ubuntu0.1
rubygem-rack - addressed in versions 2.0.3-4.fc27, 2.0.4-4.fc28, 2.0.4-4.fc29