Cisco Linksys WAG120N contains a vulnerability that could allow an authenticated, remote user to execute arbitrary code on a targeted device. Updates are not available.
Description
Cisco Linksys WAG120N contains a vulnerability that could allow an authenticated, remote user to execute arbitrary code.
The vulnerability is due to insufficient security restrictions imposed by the affected software. An authenticated, remote attacker could exploit the vulnerability by browsing to a particular HTML file and injecting crafted commands into the vulnerable form fields of the affected file. When the malicious commands are processed by the affected software, they could execute with root privileges. A successful exploit could allow the attacker to execute arbitrary commands on the device with elevated privileges.
Cisco Linksys has confirmed the vulnerability; however software updates are not available.
Warning Indicators
Cisco Linksys WAG120N running firmware versions 1.00.16 and prior is vulnerable.
IntelliShield Analysis
To exploit the vulnerability, an attacker must authenticate to the vulnerable device This access requirement could reduce the likelihood of a successful attack.
Vendor Announcements
Official vendor announcements are not available; however, Cisco Consumer customers may direct further inquiries to Cisco Consumer Support at the following link: Cisco Home Networking Support
Impact
An authenticated, remote user could exploit the vulnerability to execute arbitrary commands with root privileges, which could allow the user to completely compromise the targeted device.
Technical Information
The vulnerability is due to insufficient validation and sanitization of user-supplied input to form fields when handling the Setup_DDNS.htm file.
An authenticated, remote user could exploit the vulnerability by browsing to /setup.cgi?next_file=Setup_DDNS.htm and injecting crafted commands into the vulnerable form fields. When the malicious commands are processed by the affected software, they could execute with root privileges. A successful exploit could allow the attacker to execute arbitrary commands with root privileges and allow the attacker to completely compromise the targeted device.
Safeguards
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to allow only privileged users to access administration or management systems.
Administrators are advised to monitor affected systems.
The security vulnerability applies to the following combinations of products.
Primary Products:
Linksys by Cisco
WAG120N Wireless-N Home ADSL2+ Modem Router
1.00 .07, .11, .12, .16
Associated Products:
N/A
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