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Avast Antivirus: X.509 Error Rendering Command Execution #546

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
Avast will render the commonName of X.509 certificates into an HTMLLayout frame 
when your MITM proxy detects a bad signature. Unbelievably, this means 
CN="<h1>really?!?!?</h1>" actually works, and is pretty simple to convert into 
remote code execution.

To verify this bug, I've attached a demo certificate for you. Please find 
attached key.pem, cert.pem and cert.der. Run this command to serve it from a 
machine with openssl:

$ sudo openssl s_server -key key.pem -cert cert.pem -accept 443

Then visit that https server from a machine with Avast installed. Click the 
message that appears to demonstrate launching calc.exe.

Thanks, Tavis.

This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.

Original issue reported on code.google.com by tav...@google.com on 25 Sep 2015 at 2:43

GoogleCodeExporter commented 8 years ago 
Attaching testcases.

Original comment by tav...@google.com on 25 Sep 2015 at 2:56

Attachments:

GoogleCodeExporter commented 8 years ago 
Screenshot for reference.

Original comment by tav...@google.com on 25 Sep 2015 at 6:14

Attachments:

GoogleCodeExporter commented 8 years ago 
[deleted comment]
GoogleCodeExporter commented 8 years ago 
Avast are currently planning to push an update for this issue today.

Original comment by tav...@google.com on 30 Sep 2015 at 5:29

GoogleCodeExporter commented 8 years ago 
The patch for this issue is live, removing view restrictions.

Original comment by tav...@google.com on 1 Oct 2015 at 5:05

GoogleCodeExporter commented 8 years ago 
Will there ever be a CVE for this issue?

Original comment by athmi...@gmail.com on 7 Oct 2015 at 10:29

GoogleCodeExporter commented 8 years ago 
Good Work, bug we are sad because there are so much people that thinks the 
antivirus is the best data shield. Greets

Original comment by infrasec...@gmail.com on 8 Oct 2015 at 1:54

GoogleCodeExporter commented 8 years ago 
Google! Please make Free and dependable antivirus for us..

Original comment by RMKhur...@gmail.com on 12 Oct 2015 at 3:28

GoogleCodeExporter commented 8 years ago

Original comment by haw...@google.com on 12 Oct 2015 at 6:12

GoogleCodeExporter commented 8 years ago 
[deleted comment]
GoogleCodeExporter commented 8 years ago

Original comment by tav...@google.com on 13 Nov 2015 at 7:19