JasPer could be made to crash or run programs as your login if it opened a specially crafted file.
Jonathan Foote discovered that JasPer incorrectly handled certain malformed JPEG-2000 image files. If a user were tricked into opening a specially crafted JPEG-2000 image file, a remote attacker could cause JasPer to crash or possibly execute arbitrary code with user privileges.
20 December 2011
A security issue affects these releases of Ubuntu and its derivatives:
JasPer could be made to crash or run programs as your login if it opened a specially crafted file.
Jonathan Foote discovered that JasPer incorrectly handled certain malformed JPEG-2000 image files. If a user were tricked into opening a specially crafted JPEG-2000 image file, a remote attacker could cause JasPer to crash or possibly execute arbitrary code with user privileges.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.