NEW PASS-TA-KEY ATTACKS LET MALWARE HIJACK GOOGLE-SYNCED PASSKEYS

Summary from the TLDR InfoSec newsletter

Palo Alto Networks' Unit 42 has released details of three new attack techniques, which it calls Pass-ta-key, that an attacker with access to a TPM-equipped Windows device can use to abuse Google Password Manager's synced passkeys to steal passkeys. The first technique allows the attacker to impersonate a trusted device and request a valid authentication response for one of the victim's passkeys. If a site checks the User Verified flag of the response, the authentication can fail. The other two attack techniques go further by allowing the attacker to register their own user-verification key or even obtain the master key, which is used to encrypt all passkeys synced through the victim's Google Password Manager.