On January 17, Canonical published in a security notice details about an RPM vulnerability for its Ubuntu 12.10 (Quantal Quetzal) operating system.
According to Canonical
, RPM could incorrectly validate package signatures.
It was discovered that RPM incorrectly handled signature checking. An attacker could create a specially-crafted RPM with an invalid signature which could pass the signature validation check.
The security flaws can be fixed if you upgrade your system(s) to the latest RPM package (4.10.0-4ubuntu0.1), for Ubuntu 12.10 (Quantal Quetzal) the operating system. To apply the update, run the Update Manager application.
In general, a standard system update will make all the necessary changes. A system restart won't be necessary to implement the changes, but users have to restart the virtual machine.
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.