title: GG18 / GG20 TSS Beta Parameter Vulnerability
description: Crypto wallets implementing the GG18 or GG20 TSS protocol might allow an attacker to extract a full ECDSA private key by injecting a malicious pallier key and cheating in the range proof. Depending on the Beta parameters chosen in the protocol implementation, the attack might require 16 signatures or more fully exfiltrate the other parties' private key shares.
problem types: Private Key Exfiltration
affected:
{
defaultStatus: unaffected
product: Wallet
vendor: GG TSS Implementations
versions:
status: affected, version: 18
status: affected, version: 20
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 9.6
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
version: 3.1
]
format: CVSS
scenarios: GENERAL