Vigil@nce - Android AnySupport: privileged access via Certifi-gate
October 2015 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can invite the victim to install a malicious application on an Android phone, which connects to the AnySupport mRST, in order to perform privileged operations.
Impacted products: Android Applications not comprehensive.
Creation date: 26/08/2015.
DESCRIPTION OF THE VULNERABILITY
A mRST (mobile Remote Support Tools) is an application installed to perform administrative tasks on Android phones. They are usually installed by the phone manufacturer. A local application can connect to the mRST, after presenting a valid X.509 certificate to authenticate. The Certifi-gate vulnerability class describes authentication errors, allowing a direct access to mRST.
The mRST AnySupport is vulnerable to Certifi-gate. Indeed, an attacker can present a special certificate, in order to access to this RST.
An attacker can therefore invite the victim to install a malicious application on an Android phone, which connects to the AnySupport mRST, in order to perform privileged operations.
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