Cotonti through 1.0.0 contains an open redirect vulnerability in the cot_url_check() function that validates redirect destinations using a regular expression lacking an end-of-string anchor. Attackers can bypass the redirect guard by supplying hostnames beginning with the site domain to redirect users to attacker-controlled hosts through the ratings plugin or other redirect callers.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/Cotonti/Cotonti
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/ratings/ratings.ajax.php
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/blob/1.0.0/system/functions.php
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/issues/1891
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/pull/1899
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-un…
disclosure@vulncheck.com