OpenSign through 2.41.3 fails to validate caller identity in the getDocument cloud function when one-time-password verification is disabled. Attackers can supply a document identifier from guest signing links to retrieve complete document details including all signers' information, sender identity, and valid download tokens without authentication.
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
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
opensignlabs:opensign
References 4
https://github.com/OpenSignLabs/OpenSign
disclosure@vulncheck.com
https://github.com/OpenSignLabs/OpenSign/blob/v2.41.0/apps/OpenSignServer/cloud…
disclosure@vulncheck.com
https://github.com/OpenSignLabs/OpenSign/issues/2218
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/opensign-through-2.41.3-information-disclo…
disclosure@vulncheck.com