The Hacker News reports that 16 malicious Firefox extensions were found posing as Rabby…

Malwarebytes Labs reports that attackers compromised infrastructure behind the .gh, .sl, and .as country-code domain namespaces and used it to obtain unauthorized HTTPS certificates for Google domains and other organizations. Google blocked the certificates in Chrome and worked with certificate authorities to revoke them. Windows users should keep their browser and operating system updated and never bypass certificate warnings.

The FBI and Secret Service warn that the FortiBleed credential-harvesting campaign is still active and is targeting internet-facing Fortinet FortiGate firewalls and SSL VPN gateways. The agencies say attackers are scanning exposed devices, using stolen credentials, and may be passing access on to ransomware groups. Windows users in small offices should make sure their VPN and admin passwords are changed, active sessions are ended, and device logs are checked for suspicious activity.

The Hacker News reports that a malicious spreadsheet can make LibreOffice and Apache OpenOffice run an attacker’s code as soon as the file is opened, without a macro warning. The attack works only when Java support is enabled. LibreOffice has already fixed the flaw, and Apache OpenOffice users should turn off Java or avoid opening spreadsheets they do not trust.