In this report, we analyze the Windows, Android, and iOS versions of Tencent’s Sogou Input Method, the most popular Chinese-language input method in China. Our analysis found serious vulnerabilities in the app’s custom encryption system and how it encrypts sensitive data. These vulnerabilities could allow a network eavesdropper to decrypt sensitive communications sent by the app, including revealing all keystrokes being typed by the user. Following our disclosure of these vulnerabilities, Sogou released updated versions of the app that identified all of the issues we disclosed.
Vulnerabilities in Sogou Keyboard encryption expose keypresses to network eavesdropping.
I think the origins of this was back at the inception of Android when the default keyboard didn’t have slide technology, so at that time I think it made reasonable sense that you could bring your own keyboard app, now that Gboard is full featured it probably wouldn’t hurt to lock it down, but it also depends on if every vendor doesn’t provide their own keyboard app that is horrible to use and sets that as the only keyboard option.
I think the origins of this was back at the inception of Android when the default keyboard didn’t have slide technology, so at that time I think it made reasonable sense that you could bring your own keyboard app, now that Gboard is full featured it probably wouldn’t hurt to lock it down, but it also depends on if every vendor doesn’t provide their own keyboard app that is horrible to use and sets that as the only keyboard option.