Vulnerability Details CVE-2021-22903
The actionpack ruby gem before 6.1.3.2 suffers from a possible open redirect vulnerability. Specially crafted Host headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. This is similar to CVE-2021-22881. Strings in config.hosts that do not have a leading dot are converted to regular expressions without proper escaping. This causes, for example, `config.hosts << "sub.example.com"` to permit a request with a Host header value of `sub-example.com`.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 38.3%
CVSS Severity
CVSS v3 Score 6.1
CVSS v2 Score 5.8
References
Products affected by CVE-2021-22903
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cpe:2.3:a:rubyonrails:rails:6.1.0
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cpe:2.3:a:rubyonrails:rails:6.1.1
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cpe:2.3:a:rubyonrails:rails:6.1.2
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cpe:2.3:a:rubyonrails:rails:6.1.2.1
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cpe:2.3:a:rubyonrails:rails:6.1.3
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cpe:2.3:a:rubyonrails:rails:6.1.3.1