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Credit:
The information has been provided by Collin Mulliner and Andrea Barisani.
The original article can be found at: http://www.ocert.org/advisories/ocert-2009-014.html
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Vulnerable Systems:
* Android version 1.5 CRBxx
* Android version 1.5 and prior
Immune Systems:
* Android version 1.5 CBDxx, CRCxx and COCxx
* Android Donut DRC79
Two separate DoS issues have been independently reported to oCERT.
The most recent report concerns Android handling of SMS messages: a specific malformed SMS message can be crafted to trigger a condition that disconnects the mobile phone from the cellular network. The malformed SMS message consists of a badly formatted WAP Push message which causes an Java ArrayIndexOutOfBoundsException in the phone application (android.com.phone).
The phone application silently restarts without user awareness, this leads to a temporary loss of connectivity (as well as dropping of current calls, if any) which can be prolonged in case the phone SIM is protected by PIN, due to required PIN re-entry and the need for user attention. Triggering this bug (repeatedly in case no PIN is present) is considered a remote DoS condition.
The second report addresses a number of issues discovered in the Android's Dalvik API, one of them has been classified by the Android team as a DoS vulnerability which leads to restarting the system process.
A specific malicious application can be crafted so that if it is downloaded and executed by the user, it would trigger the vulnerable API function and restart the system process. The same condition could occur if a developer unintentionally places the vulnerable function in a place where the execution path leads to that function call. Triggering this bug is considered a DoS condition.
All the reported issues have been patched.
CVE Information:
CVE-2009-2999
Disclosure Timeline:
Malformed SMS DoS:
2009-06-19: reporters send report to Android Security team
2009-08-27: assigned CVE
2009-10-05: advisory release
Dalvik API DoS:
2009-04-24: vulnerability report received
2009-04-24: contacted Android Security team
2009-10-01: Donut released to users
2009-10-05: advisory release
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