CVE-2017-17550 : What You Need to Know
Learn about CVE-2017-17550 affecting ZyXEL ZyWALL USG devices. Discover the CSRF vulnerability allowing unauthorized user account creation and XSS attacks. Find mitigation steps and patching recommendations.
ZyXEL ZyWALL USG devices are vulnerable to cross-site request forgery (CSRF) leading to potential user account manipulation and cross-site scripting (XSS) attacks.
Understanding CVE-2017-17550
What is CVE-2017-17550?
The vulnerability in ZyXEL ZyWALL USG devices allows attackers to add a user account through a specific command, enabling subsequent XSS attacks.
The Impact of CVE-2017-17550
The vulnerability permits unauthorized creation of user accounts, facilitating malicious activities like stored XSS attacks.
Technical Details of CVE-2017-17550
Vulnerability Description
The flaw in ZyXEL ZyWALL USG devices enables CSRF attacks through the cgi-bin/zysh-cgi cmd, leading to unauthorized user account addition.
Affected Systems and Versions
- Devices: ZyXEL ZyWALL USG 2.12 AQQ.2 and 3.30 AQQ.7
- Versions: n/a
Exploitation Mechanism
Attackers exploit the vulnerability by manipulating the cgi-bin/zysh-cgi cmd to add a user account, subsequently utilizing it for XSS attacks.
Mitigation and Prevention
Immediate Steps to Take
- Disable remote access to the affected devices if not required
- Implement strong, unique passwords for user accounts
Long-Term Security Practices
- Regularly monitor and update device firmware
- Conduct security audits to identify and address vulnerabilities
Patching and Updates
Apply patches and updates provided by ZyXEL to address the CSRF vulnerability and enhance device security.