Cotonti through 1.0.0 derives password recovery validation tokens from md5(microtime()) in users.passrecover.php, creating a predictable token space of approximately one million values per second. Unauthenticated attackers can read the server Date header, precompute candidate tokens within a narrow time window, and probe them against the passrecover authentication endpoint to reset any account password including administrators.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/Cotonti/Cotonti
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.passrecov…
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/issues/1890
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/pull/1898
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/cotonti-through-1.0.0-predictable-password…
disclosure@vulncheck.com