Medium severity · published Feb 11, 2021
CVE-2021-22881
The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability
6.1
CVSS
87.3%
EPSS
No
On KEV
Description
The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an 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. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)87.3% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
33 · source: NVD
RA
Rails · Rubyonrails
6.0.0 before 6.0.3.5; 6.1.0 before 6.1.2.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22881
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22881
Mailing List
http://www.openwall.com/lists/oss-security/2021/05/05/2
Mailing List
http://www.openwall.com/lists/oss-security/2021/08/20/1
Exploit
http://www.openwall.com/lists/oss-security/2021/12/14/5
Patch
https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/
Mitigation
https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130
Exploit
https://hackerone.com/reports/1047447
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