nginx -- multiple vulnerabilities

The nginx project reports:

A stack-based buffer overflow might occur in a worker process
process while handling a specially crafted request, potentially
resulting in arbitrary code execution. [CVE-2013-2028]
A security problem related to CVE-2013-2028 was identified,
affecting some previous nginx versions if proxy_pass to
untrusted upstream HTTP servers is used.
The problem may lead to a denial of service or a disclosure of a
worker process memory on a specially crafted response from an
upstream proxied server. [CVE-2013-2070]