ZyXEL SBG-3300 Security Gateway Denial Of Service

2014.10.05
Credit: Mirko Casadei
Risk: Medium
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

######################################## #Vulnerability Title: DoS in ZyXEL SBG-3300 Security Gateway #Date: 02/10/2014 #CVE-ID: CVE-2014-7278 #Product: ZyXEL SBG3300-N series #Vendor: www.zyxel.com #Affected Firmware: Latest version at the time of disclosure V1.00(AADY.4)C0 and below (tested) #Patch: Unpatched #Authored by: Mirko Casadei ######################################## #Disclosure Timeline: 13/08/2014 Vendor Contact with Acknowledgment 13/09/2014 No response from Vendor after first contact 02/10/2014 Full Disclosure #Technical details: Abusing the 'welcome message' form, an attacker can inject JavaScript code into a core function of the main login page. The persistent javascript code injection in the framLoad() function bypass all the security checks and cause a Denial of Service disabling any access to the router web interface. Access is restored with a new firmware installation. Example of a working code: //////// !WARNING! TEST AT YOUR OWN RISK /////// var loginMsg loads input from the 'welcome message form' ... function framLoad () { var status = '0'; var count = ''; var Retry = ''; var period = ''; var loginMsg = '<DoS="javascript:alert('DoS coming!')">'; var LockTime; var waitTime; if ( advancedaccountsecurity == '0' ) { loginrandom = '0'; } ... #Remediation The vulnerable form should sanitize input. ########################################


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