exploit the possibilities

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


Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

November 2019

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Nov 1st
    28 Files
  • 2
    Nov 2nd
    1 Files
  • 3
    Nov 3rd
    1 Files
  • 4
    Nov 4th
    12 Files
  • 5
    Nov 5th
    19 Files
  • 6
    Nov 6th
    65 Files
  • 7
    Nov 7th
    22 Files
  • 8
    Nov 8th
    18 Files
  • 9
    Nov 9th
    1 Files
  • 10
    Nov 10th
    1 Files
  • 11
    Nov 11th
    11 Files
  • 12
    Nov 12th
    65 Files
  • 13
    Nov 13th
    27 Files
  • 14
    Nov 14th
    22 Files
  • 15
    Nov 15th
    18 Files
  • 16
    Nov 16th
    0 Files
  • 17
    Nov 17th
    0 Files
  • 18
    Nov 18th
    0 Files
  • 19
    Nov 19th
    0 Files
  • 20
    Nov 20th
    0 Files
  • 21
    Nov 21st
    0 Files
  • 22
    Nov 22nd
    0 Files
  • 23
    Nov 23rd
    0 Files
  • 24
    Nov 24th
    0 Files
  • 25
    Nov 25th
    0 Files
  • 26
    Nov 26th
    0 Files
  • 27
    Nov 27th
    0 Files
  • 28
    Nov 28th
    0 Files
  • 29
    Nov 29th
    0 Files
  • 30
    Nov 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2019 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close