Thinbus Javascript Secure Remote Password is a browser SRP6a implementation for zero-knowledge password authentication. In versions 2.0.0 and below, a protocol compliance bug causes the client to generate a fixed 252 bits of entropy instead of the intended bit length of the safe prime (defaulted to 2048 bits). The client public value is being generated from a private value that is 4 bits below the specification. This reduces the protocol's designed security margin it is now practically exploitable. The servers full sized 2048 bit random number is used to create the shared session key and password proof. This is fixed in version 2.0.1.
History

Thu, 07 Aug 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 07 Aug 2025 00:45:00 +0000

Type Values Removed Values Added
Description Thinbus Javascript Secure Remote Password is a browser SRP6a implementation for zero-knowledge password authentication. In versions 2.0.0 and below, a protocol compliance bug causes the client to generate a fixed 252 bits of entropy instead of the intended bit length of the safe prime (defaulted to 2048 bits). The client public value is being generated from a private value that is 4 bits below the specification. This reduces the protocol's designed security margin it is now practically exploitable. The servers full sized 2048 bit random number is used to create the shared session key and password proof. This is fixed in version 2.0.1.
Title Thinbus generates insufficient entropy: 252 bits vs minimum 256 bits
Weaknesses CWE-331
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2025-08-07T00:02:42.612Z

Updated: 2025-08-07T14:13:18.243Z

Reserved: 2025-07-31T17:23:33.476Z

Link: CVE-2025-54885

cve-icon Vulnrichment

Updated: 2025-08-07T14:13:15.447Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-08-07T01:15:26.693

Modified: 2025-08-07T21:26:37.453

Link: CVE-2025-54885

cve-icon Redhat

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