Several vulnerabilities have been discovered in the interpreter for the Ruby language, which may lead to denial of service and other security problems. The Common Vulnerabilities and Exposures project identifies the following problems:
Keita Yamaguchi discovered that several safe level restrictions are insufficiently enforced.
Christian Neukirchen discovered that the WebRick module uses inefficient algorithms for HTTP header splitting, resulting in denial of service through resource exhaustion.
It was discovered that the dl module doesn't perform taintness checks.
Luka Treiber and Mitja Kolsek discovered that recursively nested XML entities can lead to denial of service through resource exhaustion in rexml.
Tanaka Akira discovered that the resolv module uses sequential transaction IDs and a fixed source port for DNS queries, which makes it more vulnerable to DNS spoofing attacks.
For the stable distribution (etch), these problems have been fixed in version 1.9.0+20060609-1etch3. Packages for arm will be provided later.
For the unstable distribution (sid), these problems have been fixed in version 18.104.22.168-6.
We recommend that you upgrade your ruby1.9 packages.