APPLE-SA-2010-11-22-1 iOS 4.2 for iPhone, iPod Touch, iPad

Apple has released over 80 patches in its latest update of iOS, the
operating system for its iPhone, iPod Touch, iPad devices.
Vulnerabilities mitigated in this release include: arbitrary code
execution, unexpected application termination and unexpected system

It is recommended that users of these devices update to the latest
version of iOS to avoid exploitation.