Ludwig Nussel discovered that banshee contained a script that could be abused by an attacker to execute arbitrary code.

The vulnerability is due to an insecure change to LD_LIBRARY_PATH, and environment variable used by ld.so(8) to look for libraries in directories other than the standard paths.  When there is an empty item in the colon-separated list of directories in LD_LIBRARY_PATH, ld.so(8) treats it as a '.' (current working directory).  If the given script is executed from a directory where a local attacker could write files, there is a chance for exploitation.

In Fedora, both /usr/bin/banshee-1 and /usr/bin/muinshee re-set LD_LIBRARY_PATH insecurely (incidentally, GST_PLUGIN_PATH is also re-set insecurely):

export LD_LIBRARY_PATH=/usr/lib:/usr/lib/banshee-1:/usr/lib/banshee-1/Extensions:/usr/lib/banshee-1/Backends${LD_LIBRARY_PATH+:$LD_LIBRARY_PATH}
export GST_PLUGIN_PATH=/usr/lib/banshee-1/gstreamer-0.10${GST_PLUGIN_PATH+:$GST_PLUGIN_PATH}

A solution is to patch the script to use ':+:' properly:

export LD_LIBRARY_PATH=/usr/lib/foo${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}