In TextView, selecting character string is impossible as default, so normally no counter-measure is required, but in some cases copying is possible depends on application’s specifications. */ package .leakage import import android.os.Bundle import import import import import public class UncopyableActivity extends Activity Ħ.1.3.1. * See the License for the specific language governing permissions and * limitations under the License. * You may obtain a copy of the License at * * * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. java /* * Copyright (C) 2012-2021 Japan Smartphone Security Association * * Licensed under the Apache License, Version 2.0 (the "License") * you may not use this file except in compliance with the License. InputType.TYPE_TEXT_VARIATION_WEB_PASSWORD In this case, no counter-measures are required since copy/cut are prohibited as default. 6.1.1, “Input type is fixed to Password attribute” means, the input type is necessarily either of the followings three when application is running. Necessary of counter-measure can be determined as per the flow of Fig. This section herein describes the easy and effective methods: One method is to disable long press View and another method is to delete copy/cut items from menu when selecting character string. There are several methods to prohibit copying/cutting. If there are no copy/cut functions in View where the sensitive information (like personal information) is input/output, information leakage will never happen from your application via Clipboard. In this case, the sound counter-measure for leakage is to prohibit copying/cutting operations from View (TextView, EditText etc.). Next discussion is the countermeasure 2 above, supposing that the scenario that a user copies sensitive information displayed in your application. So, regarding the countermeasure 1, there’s no method other than explaining users the risk of copying & pasting sensitive information, and just continuing to enlighten users to decrease the actions themselves continuously. Since there’s no function in Android to control copy operations by the third party application. As it turns out, there’s no basic counter-measure to prevent from sensitive information leakage due to copy & paste, in this scenario. Supposing that a user copies character strings from other applications like note pad, Web browser or mailer application, and then paste it to EditText in your application. Counter-measure when copying from your application to other applications.įirstly, let us discuss the countermeasure 1 above.Counter-measure when copying from other applications to your application.Roughly speaking, there are two outlooks of counter-measures to mitigate the risk of information leakage form Clipboard. Hence, application developers need to take measures to minimize the possibility of information leakage, considering the Android OS specifications. It means that all the information which user copied/cut, is leaked out to the malicious application. It is because the entity of Clipboard is single in a system and any application can obtain the information stored in Clipboard at any time by using ClipboardManager. So there is a risk which leads to information leakage in this Clipboard function. The information stored in Clipboard is distributed to other applications when it is pasted by a user or an application. The information which was copied by user or application, is once stored in the buffer called Clipboard. The risk is related to mechanism of copy & paste in Android system. These are very casual actions at a glance, but actually there’s a hidden risk that user handling information may be stolen. For example, not a few users use these functions to store curious information or important information to remember in a mail or a web page into a notepad, or to copy and to paste a password from a notepad in which passwords are stored in order not to forget in advance. Risk of Information Leakage from Clipboard ¶Ĭopy & paste are the functions which users often use in a casual manner.
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