Emacs developers report:
The Emacs command `run-python' launches an interactive Python interpreter. After the Python process starts up, Emacs automatically sends it the line:
import emacs
which normally imports a script named emacs.py which is distributed with Emacs. This script, which is typically located in a write-protected installation directory with other Emacs program files, defines various functions to help the Python process communicate with Emacs.
The vulnerability arises because Python, by default, prepends '' to the module search path, so modules are looked for in the current directory. If the current directory is world-writable, an attacker may insert malicious code by adding a fake Python module named emacs.py into that directory.
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