Canonical is fast in fixing the vulnerabilities and has fixed Ruby and Gnome vulnerabilities which were reported in the Ubuntu.They fixed the vulnerabilities for Ruby and Gnome online accounts.
The summary for the vulnerabilities are:-
Canonical reported that Ruby REXML library incorrectly handled XML entity expansion. An attacker could use this flaw to cause Ruby to consume large amounts of memory, resulting in a denial of service.
Affected Systems:- Ubuntu 10.o4 LTS , 11.10, 12.04 LTS and 12.10 systems
Gnome online accounts vulnerability
Canonical reported about the vulnerability in GNOME Online Accounts .The accounts did not properly check SSL certificates when configuring online accounts. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could be exploited to alter or compromise credentials and confidential information.
Affected Systems:- Ubuntu 11.10, 12.04 LTS ,12.10
Running the update manager fixes both the issues.