putty - security update

It was discovered that PuTTY’s terminal emulator did not properly
validate the parameter to the ECH (erase characters) control sequence,
allowing a denial of service and possibly remote code execution.

For the oldoldstable distribution (squeeze), this problem has been
fixed in version 0.60+2010-02-20-1+squeeze4.

For the oldstable (wheezy) and stable (jessie) distributions, this
problem will be fixed soon.