Zack Weinberg found a vulnerability in the way the exevpe() method
from the os.py module uses a temporary file name. A file which
supposedly should not exist is created in a unsafe way and the method
tries to execute it. The objective of such code is to discover what
error the operating system returns in a portable way.
By exploiting this vulnerability a local attacker can execute
arbitrary code with the privileges of the user running python code
which uses the execvpe() method.
http://python.org/sf/590294http://python.org/sf/601077
