ruby -- multiple vulnerabilities

Secunia reports:

Two vulnerabilities have been reported in Ruby, which can be exploited by malicious people to bypass certain security restrictions.

1. An error in the handling of the "alias" functionality can be exploited to bypass the safe level protection and replace methods called in the trusted level.
2. An error caused due to directory operations not being properly checked can be exploited to bypass the safe level protection and close untainted directory streams.

[source]