(RHSA-2010:0039) Moderate: gcc and gcc4 security update

The gcc and gcc4 packages include, among others, C, C++, and Java GNU
compilers and related support libraries. libgcj contains a copy of GNU
Libtool’s libltdl library.

A flaw was found in the way GNU Libtool’s libltdl library looked for
libraries to load. It was possible for libltdl to load a malicious library
from the current working directory. In certain configurations, if a local
attacker is able to trick a local user into running a Java application
(which uses a function to load native libraries, such as
System.loadLibrary) from within an attacker-controlled directory containing
a malicious library or module, the attacker could possibly execute
arbitrary code with the privileges of the user running the Java
application. (CVE-2009-3736)

All gcc and gcc4 users should upgrade to these updated packages, which
contain a backported patch to correct this issue. All running Java
applications using libgcj must be restarted for this update to take effect.