|
Size: 2018
Comment:
|
← Revision 17 as of 2019-12-15 07:15:55 ⇥
Size: 2919
Comment: Remove Py2 specific, dead links
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 2: | Line 2: |
== tav's jail == http://tav.espians.com/a-challenge-to-break-python-security.html * Remove evil attributes like frame.f_globals or object.__subclasses__ * Remove evil builtins like compile(), import() or reload() == Zope security == http://svn.zope.org/zope.security/trunk/src/zope/security/ * Sandboxing * Object proxies |
|
| Line 5: | Line 19: |
| Nicole King (cats-muvva.net) wrote a taint mode for CPython 3.0: [[http://www.cats-muvva.net/software/|Python Taint Management]]. | Nicole King at one point wrote a taint mode for CPython 3.0, but the site (http://www.cats-muvva.net/software/) is no longer functioning. |
| Line 14: | Line 28: |
| See also the presentation: [[http://us.pycon.org/common/talkdata/PyCon2007/062/PyCon_2007.pdf|Securing Python: Controling the abilities of the interpreter]], PyCon US 2007, Brett Cannon and Eric Wohlstadter | See also the presentation: [[http://us.pycon.org/common/talkdata/PyCon2007/062/PyCon_2007.pdf|Securing Python: Controlling the abilities of the interpreter]], PyCon US 2007, Brett Cannon and Eric Wohlstadter Related issue: [[http://bugs.python.org/issue500698|Taint a la Perl?]]. |
| Line 30: | Line 46: |
| See PyPy project: [[http://codespeak.net/pypy/dist/pypy/doc/sandbox.html|PyPy's sandboxing features]]. | * PyPy project: [[http://codespeak.net/pypy/dist/pypy/doc/sandbox.html|PyPy's sandboxing features]]. * [[http://mail.python.org/pipermail/python-dev/2008-September/082475.html|CapPython]] is an object-capability subset of Python, inspired by Joe-E and Caja/Cajita, which are object-capability subsets of Java and Javascript respectively. * SandboxedPython * [[How can I run an untrusted Python script safely (i.e. Sandbox)]] * [[http://mail.python.org/pipermail/python-dev/2009-June/090038.html|CPython in the web browser under Native Client]] |
| Line 41: | Line 61: |
| Victor Stinner wrote a fuzzer called [[http://fusil.hachoir.org/trac/|Fusil]] to test Python. It already helped to fix many bugs. fusil-python works on Python 2.4 .. 3.0. | Victor Stinner wrote a fuzzer called [[https://github.com/clem1/segvault/tree/master/fusil|Fusil]] to test Python. It already helped to fix many bugs. fusil-python works on Python 2.4 .. 3.0. |
Notes about Python Security.
tav's jail
http://tav.espians.com/a-challenge-to-break-python-security.html
Remove evil attributes like frame.f_globals or object.subclasses
- Remove evil builtins like compile(), import() or reload()
Zope security
http://svn.zope.org/zope.security/trunk/src/zope/security/
- Sandboxing
- Object proxies
Taint mode
Nicole King at one point wrote a taint mode for CPython 3.0, but the site (http://www.cats-muvva.net/software/) is no longer functioning.
Problems:
amaury: The patch is indeed huge!
fijall: it seems that every function that returns a PyObject must be modified
fijall: need to patch (...) all places that might modify anything. (All side effects)
=> ncoghlan: PyPy is still a *much* better platform for that kind of experimentation than CPython
See also the presentation: Securing Python: Controlling the abilities of the interpreter, PyCon US 2007, Brett Cannon and Eric Wohlstadter
Related issue: Taint a la Perl?.
Python Security Response Team
Some members:
- Brett Cannon
Email: security AT python.org
Controlling Access to Resources Within The Python Interpreter
Paper: Controlling Access to Resources Within The Python Interpreter, Brett Cannon and Eric Wohlstadter, University of British Columbia
Sandboxing
PyPy project: PyPy's sandboxing features.
CapPython is an object-capability subset of Python, inspired by Joe-E and Caja/Cajita, which are object-capability subsets of Java and Javascript respectively.
How can I run an untrusted Python script safely (i.e. Sandbox)
Unsafe modules
- os.kill(), os.chown(), os.unlink(), ...
- imageop: many bugs
CVE-2007-4965: Integer overflow in imageop module (2007-09 .. 2008-08)
Buffer overflow in imageop module (rgb2rgb8): fixed in Python 2.6.1 and Python 3.0
Fuzzing
Victor Stinner wrote a fuzzer called Fusil to test Python. It already helped to fix many bugs. fusil-python works on Python 2.4 .. 3.0.
Fusil was also used on PyPy (Finding Bugs in PyPy with a Fuzzer).