FreeBSD 4.5 syncache / syncookies Denial Of Service Vulnerability

Solution:
FreeBSD suggests that one of these issues may be dealt with by disabling syncookies through the following command:

# sysctl -w net.inet.tcp.syncookies=0

This issue was resolved in 4.5-STABLE on January 21, 2002.

A patch is also available. The following patch instructions have been supplied:

Execute the following commands as root:

# cd /usr/src
# patch -p < /path/to/patch

Recompile your kernel as described in http://www.freebsd.org/handbook/kernelconfig.html and reboot the system.


FreeBSD FreeBSD 4.5 -RELEASE

FreeBSD FreeBSD 4.5 -STABLE


 

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