On Thursday, Check Point Software Technologies released updated versions of all its ZoneAlarm products, addressing an incompatibility with a patch Microsoft released earlier this week.
The fix requires ZoneAlarm users to download the latest version, 7.0.438.000, from its site. A reboot is required to complete installation.
Since Tuesday, ZoneAlarm customers have complained that access to the Internet was denied after installing MS08-037, a patch designed by Microsoft to correct a vulnerability in both the client and server Domain Name System packages within Windows. Earlier on Tuesday, a security researcher announced a massive, multi-vendor patch release to address a fundamental flaw in DNS that could allow attackers to spoof IP addresses.
Workarounds included uninstalling MS08-037, changing ZoneAlarm's settings from high to medium, or temporarily using the Windows Firewall instead.
Check Point provided no additional comments about the cause of the outage.