CVE-2022-47930: iofinnet tss-lib Authentication Bypass by Capture-replay

Vulnerability summary

CVE-2022-47930 is a medium (CVSS 6.8) Authentication Bypass by Capture-replay vulnerability in iofinnet tss-lib. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 44.4% of scored vulnerabilities.

Timeline

1. 21-04-2023
   PublishedVulnerability first disclosed.
2. 05-02-2025
   Last modifiedVulnerability information updated.

Description

An issue was discovered in IO FinNet tss-lib before 2.0.0. The parameter ssid for defining a session id is not used through the MPC implementation, which makes replaying and spoofing of messages easier. In particular, the Schnorr proof of knowledge implemented in sch.go does not utilize a session id, context, or random nonce in the generation of the challenge. This could allow a malicious user or an eavesdropper to replay a valid proof sent in the past.

• CWE-294Authentication Bypass by Capture-replayA capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).