http://www.coresecurity.com/index.php5?module=ContentMod&action=item&id=1703 says: Vulnerable Packages OpenBSD 4.1 prior to Feb. 26th, 2006. OpenBSD 4.0 Current OpenBSD 4.0 Stable [...]
OpenBSD-current, 4.1, 4.0 and 3.9 have the fix incorporated in their source code tree and kernel binaries for those versions and the upcoming version 4.1 include the fix. I have OpenBSD 4.0. Is my system vulnerable or not? CL<