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ANDROID 11 | VPN & APP USE CERTIFICATE UNABLE TO INSTALL

Shubham | Last updated: Aug 30, 2021 07:24PM UTC

I downloaded cacert.der, Now I have cacert.der cacert.cer cacert.crt In certificate sections I have, CA - cacert.cer worked VPN & apps - UNABLE TO INSTALL so I cannot burp any app except google chrome WIFI - cacert.cer worked ERR: - chrome works perfectly In FB or any other apps shows NO INTERNET CONNECTION

Ben, PortSwigger Agent | Last updated: Aug 31, 2021 01:25PM UTC

Hi Shubham, On a general note, it might be easier (in terms of information sharing) if you send us an email at support@portswigger.net and include some screenshots of the setup that you currently have and the issues that you are experiencing. To confirm, are you able to proxy HTTP and HTTP/S traffic from the browser on your mobile device through Burp and it is just traffic from the mobile apps that you are experiencing issues with or am i misunderstanding your forum post?

Yash | Last updated: Sep 25, 2021 04:33PM UTC

Hello sir I'm too facing this problem while importing .cer file in VPN & apps option

Ben, PortSwigger Agent | Last updated: Sep 27, 2021 07:55AM UTC

Hi Yash, Are you able to provide us with details of the steps that you have taken to try and get this to work alongside the exact issue that you are experiencing? As noted above, it is usually easier to send us an email at support@portswigger.net and include some screenshots of your setup and the issues that you are facing so that we can see exactly what is happening.

Md | Last updated: Jan 07, 2022 01:16PM UTC

need help for this problem!! Video Link: https://www.youtube.com/watch?v=GzRXbHubILQ&ab_channel=NewGamingTV Please replay as soon as possible.

Ben, PortSwigger Agent | Last updated: Jan 07, 2022 03:45PM UTC

Hi, I have just replied to your email regarding this issue but will repost the information here. For versions of Android of 7 and above you have to install the certificate at the system level on a rooted device (Android changed the way that user supplied certificates are trusted in this version). The following is the best guide I have seen for this (if you follow from the 'Install Burp CA as a system-level trusted CA' section): https://blog.ropnop.com/configuring-burp-suite-with-android-nougat/ Essentially, you need to convert the certificate and then add it to a certain location on the file system of the device.

Unknown | Last updated: Jun 14, 2023 12:39PM UTC

In certificate sections I have, CA - cacert.cer worked VPN & apps - UNABLE TO INSTALL so I cannot burp any app except google chrome WIFI - cacert.cer worked I'm too facing the same problem, it works for CA Cretificate and WIfi Certificate but prompts an error while installing for VPN and APPS can anyone help me to resolve this out ?

Ben, PortSwigger Agent | Last updated: Jun 14, 2023 01:02PM UTC

Hi, As noted in the previous posts in this thread, for Android 7 and above you have to place a converted Burp CA certificate within a specific location in the file system on the mobile device if you want to interact with HTTPS traffic. The following is a useful guide on the steps to do this: https://blog.ropnop.com/configuring-burp-suite-with-android-nougat/ Due to some changes in how certificate transparency works, later versions of Chrome (version 99 and above) will actually allow you to proxy HTTPS traffic with the Burp CA certificate installed as the normal user. If, however, you want to interact with HTTPS traffic in different browsers and within mobile apps you would need to install the certificate as detailed in the above link whilst also, if you do wish to also utilise Chrome versions 99 and above, making the following additional configuration changes: https://httptoolkit.com/blog/chrome-android-certificate-transparency/ In essence, following both guides should allow you to proxy HTTPS traffic in all browsers and mobile apps (assuming the mobile apps in question are not employing further defensive mechanisms such as SSL pinning). These activities need to be carried out on a rooted device or emulator.

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