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Many WAP browsers have limited or no cookie support In order to give the user a stateful user experience, many web applications track user sessions by using a session
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9: WAP and Mobile HTML Security
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identifier in the URL Oftentimes, the identifier is not reset after authentication, enabling attackers to target users with a session fixation attack The attacker would perform this attack by sending the victim a specially crafted e-mail link and persuading them to follow it The link contains the information from the legitimate organization, so there is a high probability the victim would see the link as trustworthy Once the user logs in, the attacker can use the activated session ID to gain access to the user s account The attacker does not have to convince the user to provide their credentials or lure them to a malicious website Session fixation is mitigated by resetting the session identifier after the user logs in The attacker will no longer have knowledge of the user s session identifier and will be prevented from accessing the user s account Ideally, session ID should not be in a URL; even if it is reset after login, it could get leaked via other methods, such as referrer headers and non-SSL pages
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Although not really a popular attack class on traditional web applications, the use of non-SSL forms on mobile HTML applications is still pretty common The argument is that the initial SSL handshake between the client and the server is too performance heavy to use on mobile devices with limited CPU and memory capacities The end result creates a situation where the same username and password that undergo a significant amount of protection on modern web applications are sent loosely in the clear over mobile HTML sites One could argue that because the ability to sniff on a GSM or CDMA network is not as easy, clear-text transmission of credentials is not so big an issue; however, at some point, the communication medium will change from GSM/CDMA to Ethernet, usually after the WAP gateway/proxy, thus allowing attackers on the other side of the fence to capture the clear-text credentials Although the exploit scenario is more difficult, the idea of a username and password (which provide the ability to move money from one entity to another) passing through the network in clear text is less than an ideal situation A good way to test for non-SSL forms is simply to check for the use of HTTP (not HTTPS) on your mobile browser using the mobile HTML page
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A tremendous amount of research still needs to be done on the security of WAP and mobile browsers the field is still very green from a security perspective Overall, the restriction of the WAP or mobile browser and what it s able to support will
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expose new attacks surfaces that were previously mitigated in traditional browsers The following items are known limitations to date of WAP and mobile browsers, but this list should not be considered exhaustive
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Lack of HTTPOnly Flag Support
Traditional mitigations to cross-site scripting, such as the HTTPOnly flag, may or may not be possible on mobile browsers Although Internet Explorer and Firefox both support the use of the HTTPOnly flag, which helps mitigate XSS attacks, the protection will be of little help unless a mobile browser supports the flag For example, if a web application is relying on the HTTPOnly flag solely for its defense of XSS, an attacker might force the victim to view a vulnerable page on a mobile browser instead, where the protection does not live, and thus complete the attack despite the use of the flag
Lack of SECURE Flag Support
Similar to the HTTPOnly flag, the mobile browser may or may not support the SECURE flag The WAP or mobile browser s treatment of this flag will affect the security of the site For example, if a site should use SSL, such as in the login part of the site, but the browser does not honor the SECURE flag on the sensitive cookies, the browser should fail and not complete the request In the case where the browser does not honor the SECURE flag but does not fail, it will let the sensitive cookie pass in the clear Thus, an attacker can perform a downgrade attack to a non-SSL page and sniff the sensitive cookies over the wire Hence, the protection held on a web application on PC systems has been totally eliminated once the same site has been accessed by a WAP or mobile browser
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