exploit the possibilities

Netgear DGN Authentication Bypass / Command Execution

Netgear DGN Authentication Bypass / Command Execution
Posted Jun 3, 2013
Authored by Roberto Paleari

Netgear DGN1000 with firmware version prior to 1.1.00.48 and Netgear DGN2200 version 1 suffer from authentication bypass and command execution vulnerabilities.

tags | exploit, vulnerability, bypass
MD5 | e998700ff9d13aad687168abc14751dc

Netgear DGN Authentication Bypass / Command Execution

Change Mirror Download
Unauthenticated command execution on Netgear DGN devices
========================================================

[ADVISORY INFORMATION]
Title: Unauthenticated command execution on Netgear DGN devices
Discovery date: 01/05/2013
Release date: 31/05/2013
Credits: Roberto Paleari (roberto@greyhats.it, twitter: @rpaleari)

[VULNERABILITY INFORMATION]
Class: Authentication bypass, command execution

[AFFECTED PRODUCTS]
This security vulnerability affects the following products and firmware
versions:
* Netgear DGN1000, firmware version < 1.1.00.48
* Netgear DGN2200 v1
Other products and firmware versions are probably also vulnerable, but they
were not checked.

[VULNERABILITY DETAILS]
Attackers can leverage this vulnerability to bypass existing authentication
mechanisms and execute arbitrary commands on the affected devices, with root
privileges.

Briefly, the embedded web server skips authentication checks for some URLs
containing the "currentsetting.htm" substring. As an example, the following URL
can be accessed even by unauthenticated attackers:

http://<target-ip-address>/setup.cgi?currentsetting.htm=1

Then, the "setup.cgi" page can be abused to execute arbitrary commands. As an
example, to read the /www/.htpasswd local file (containing the clear-text
password for the "admin" user), an attacker can access the following URL:

http://<target-ip-address>/setup.cgi?next_file=netgear.cfg&todo=syscmd&cmd=cat+/www/.htpasswd&curpath=/&currentsetting.htm=1

Basically this URL leverages the "syscmd" function of the "setup.cgi" script to
execute arbitrary commands. In the example above the command being executed is
"cat /www/.htpasswd", and the output is displayed in the resulting web
page. Slightly variations of this URL can be used to execute arbitrary
commands.

[REMEDIATION]
For DGN1000, Netgear included a fix for this issue inside firmware version
1.1.00.48. According to Netgear, DGN2200 v1 is not supported anymore, while v3
and v4 should not be affected by this issue; these versions were not tested by
the author.

[DISCLAIMER]
The author is not responsible for the misuse of the information provided in
this security advisory. The advisory is a service to the professional security
community. There are NO WARRANTIES with regard to this information. Any
application or distribution of this information constitutes acceptance AS IS,
at the user's own risk. This information is subject to change without notice.

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

March 2020

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    2 Files
  • 2
    Mar 2nd
    18 Files
  • 3
    Mar 3rd
    15 Files
  • 4
    Mar 4th
    12 Files
  • 5
    Mar 5th
    19 Files
  • 6
    Mar 6th
    8 Files
  • 7
    Mar 7th
    1 Files
  • 8
    Mar 8th
    1 Files
  • 9
    Mar 9th
    11 Files
  • 10
    Mar 10th
    15 Files
  • 11
    Mar 11th
    9 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    13 Files
  • 14
    Mar 14th
    10 Files
  • 15
    Mar 15th
    13 Files
  • 16
    Mar 16th
    27 Files
  • 17
    Mar 17th
    15 Files
  • 18
    Mar 18th
    23 Files
  • 19
    Mar 19th
    25 Files
  • 20
    Mar 20th
    10 Files
  • 21
    Mar 21st
    6 Files
  • 22
    Mar 22nd
    1 Files
  • 23
    Mar 23rd
    22 Files
  • 24
    Mar 24th
    15 Files
  • 25
    Mar 25th
    22 Files
  • 26
    Mar 26th
    20 Files
  • 27
    Mar 27th
    15 Files
  • 28
    Mar 28th
    10 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2016 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close