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Pygments FontManager._get_nix_font_path Shell Injection

Pygments FontManager._get_nix_font_path Shell Injection
Posted Oct 2, 2015
Authored by Javantea

Pygments FontManager._get_nix_font_path version 1.2.2-2.0.2 suffers from a shell injection vulnerability.

tags | advisory, shell
MD5 | dc4d323204e5628ee7b285698adfb690

Pygments FontManager._get_nix_font_path Shell Injection

Change Mirror Download
Shell Injection in Pygments FontManager._get_nix_font_path

Product: Pygments
Version: 1.2.2-2.0.2 497:fe62167596bb to 3693:655dbebddc23 Tue Nov 06 17:30:45 2007 +0000 to Aug 21, 2015.
Website: http://pygments.org/
Bitbucket: https://bitbucket.org/birkenfeld/pygments-main
CVSS Score: 10.0 (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Discovery: Aug 21, 2015

An unsafe use of string concatenation in a shell string occurs in FontManager. If the developer allows the attacker to choose the font and outputs an image, the attacker can execute any shell command on the remote system. The name variable injected comes from the constructor of FontManager, which is invoked by ImageFormatter from options.

pygments/formatters/img.py:82

def _get_nix_font_path(self, name, style):
try:
from commands import getstatusoutput
except ImportError:
from subprocess import getstatusoutput
exit, out = getstatusoutput('fc-list "%s:style=%s" file' %
(name, style))
if not exit:
lines = out.splitlines()
if lines:
path = lines[0].strip().strip(':')
return path

https://bitbucket.org/birkenfeld/pygments-main/src/655dbebddc23943b8047b3c139c51c22ef18fd91/pygments/formatters/img.py?at=default&fileviewer=file-view-default#img.py-82

Recommendation

shlex.quote should be used to ensure that an attacker cannot inject commands.
https://docs.python.org/3/library/shlex.html#shlex.quote

A pull request has been made since the author did not respond to e-mail, Twitter, or IRC.
https://bitbucket.org/birkenfeld/pygments-main/pull-requests/501/fix-shell-injection-in/diff

Regards,
Javantea


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