oss-sec mailing list archives
Re: CVE request -- Python < 2.6 PySys_SetArgv issues (epiphany, csound, dia, eog, gedit, xchat, vim, nautilus-python, Gnumeric)
From: Robert Buchholz <rbu () gentoo org>
Date: Wed, 28 Jan 2009 12:48:17 +0100
On Monday 26 January 2009, Jan Lieskovsky wrote:
Though this is a Python flaw (insertion of cwd at the beginning of the Python modules search path), according to our Python maintainers it can't be fixed on Python's side due the need of ensuring the work of other numerous packages, when loading Python modules.
Your subject seems to claim that this vulnerability is fixed on the Python side in 2.6 -- can you elaborate on that? James Vega in the bug report you referenced [1] wrote:
This problem should be solved in 2.6 since absolute imports are the default.
However, the specification of absolute imports [2] states:
import foo refers to a top-level module or to another module inside the package. [...] To resolve the ambiguity, it is proposed that foo will always be a module or package reachable from sys.path. This is called an absolute import.
So absolute imports do not fix situations where you (e.g.) "import re" with CWD=/tmp in sys.path. Also, the test case shows that at least Python 2.6.1's PySys_SetArgv behaves the same: $ ./484305 "" [''] ['', '/usr/lib64/python26.zip', '/usr/lib64/python2.6', '/usr/lib64/python2.6/plat-linux2', '/usr/lib64/python2.6/lib-tk', '/usr/lib64/python2.6/lib-old', '/usr/lib64/python2.6/lib-dynload', '/usr/lib64/python2.6/site-packages', '/usr/lib64/portage/pym'] Regards, Robert [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=484305 [2] http://www.python.org/dev/peps/pep-0328/#rationale-for-absolute-imports
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Current thread:
- CVE request -- Python < 2.6 PySys_SetArgv issues (epiphany, csound, dia, eog, gedit, xchat, vim, nautilus-python, Gnumeric) Jan Lieskovsky (Jan 26)
- Re: CVE request -- Python < 2.6 PySys_SetArgv issues (epiphany, csound, dia, eog, gedit, xchat, vim, nautilus-python, Gnumeric) Steven M. Christey (Jan 27)
- Re: CVE request -- Python < 2.6 PySys_SetArgv issues (epiphany, csound, dia, eog, gedit, xchat, vim, nautilus-python, Gnumeric) Robert Buchholz (Jan 28)