CVE-2025-54885

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/simbo1905/thinbus-srp-npm/issues/28
https://github.com/simbo1905/thinbus-srp-npm/pull/30/commits/4aeaea2366e090765a8204059c7bcf3616438d31
https://github.com/simbo1905/thinbus-srp-npm/security/advisories/GHSA-8q6v-474h-whgg

Configurations

No configuration.

History

07 Aug 2025, 21:26

Type	Values Removed	Values Added
Summary		(es) Thinbus Javascript Secure Remote Password es una implementación de SRP6a para navegadores que permite la autenticación de contraseñas de conocimiento cero. En las versiones 2.0.0 y anteriores, un error de cumplimiento del protocolo provoca que el cliente genere una entropía fija de 252 bits en lugar de la longitud de bits prevista para el primo seguro (predeterminada en 2048 bits). El valor público del cliente se genera a partir de un valor privado 4 bits por debajo de la especificación. Esto reduce el margen de seguridad diseñado para el protocolo y ahora es prácticamente explotable. El número aleatorio completo de 2048 bits del servidor se utiliza para crear la clave de sesión compartida y la prueba de contraseña. Esto se solucionó en la versión 2.0.1.

07 Aug 2025, 01:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-08-07 01:15

Updated : 2025-08-07 21:26

NVD link : CVE-2025-54885

Mitre link : CVE-2025-54885

CVE.ORG link : CVE-2025-54885

JSON object : View

Products Affected

No product.

CWE

CWE-331

Insufficient Entropy

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