QNAP Turbo NAS with firmware versions 3.6.1 Build 0302T and below suffer from a command injection vulnerability that allows for remote code execution.
Product. QNAP
Platform. Turbo NAS (verified) and possibly others
Affected versions. Firmware Version: 3.6.1 Build 0302T and prior
Severity Rating. High
Impact. Exposure of sensitive information
Exposure of system information
Privilege escalation
System access
Attack Vector. Remote with authentication
Solution Status. Currently no software update;
vendor has elected not to fix at this time
CVE reference. CVE - not yet assigned
Details.
QNAP provide NAS technology solutions to consumers and enterprises.
Multiple vulnerabilities have been identified in the web management
interface.
1. Command Injection:
The QNAP Download Station (QDownload) is vulnerable to command injection
as the application executes user-controllable data that is processed by
a shell command interpreter.
The following resources, accessible post authentication are affected:
/cgi-bin/Qdownload/DS_RSS_Option.cgi [keyword parameter]
/cgi-bin/Qdownload/DS_RSS_Option.cgi [title parameter]
Commands are executed with the context of the admin user [uid=0(admin)
gid=0(administrators] on the QNAP device.
Proof of Concept.
/cgi-bin/Qdownload/DS_RSS_Option.cgi?_dc=1331164660690&url=http%3A%2F%2F
google.com&title=test&keyword=`touch%20%2ftesto%2etxt`&todo=add&sid=i9
nonapr&ver=2.0
2. Cryptography:
The QNAP login page stores persistent cookies (including the administrator
username and password) as base64 encoded strings inside the cookie
parameter nas_p. These cookies are not protected with either the HTTPOnly
or Secure flags allowing theft via one of the many cross-site scripting
vulnerabilities which exist within the application (disclosed previously
by another researcher, but never fixed).
Proof of Concept.
Cookie: qnap_admin_style=default; nas_save_u=1; nas_u=bGFicw==;
nas_address=10.1.1.2; nas_save_p=1; nas_p= YWRtaW5UMG1iJTI0dDBuMw==;
nas_tree_x=240; nas_tree_y=370
YWRtaW5UMG1iJTI0dDBuMw== decodes to admin123qweasd
Solution.
No vendor solution.
Discovered by.
Nadeem Salim and Phil Taylor from Sense of Security Labs.
