Author Topic: Avast pop up windows blocks ultravnc teamviewer etc.  (Read 8623 times)

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Offline charlierainbow

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #15 on: July 28, 2018, 11:48:47 PM »
Especially,

Thanks. It seems to be all about that chat window. Nevertheless, it's still only a partial work-around in that, in the end, one still can't interact with Avast remotely. In my role as remote administrator, I'd sure like to be able to interact with the AV software!!

Offline Spec8472

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #16 on: July 30, 2018, 09:11:54 AM »
Hi,
Avast is blocking all emulated user input coming from an unsigned process when an Avast window is the foreground window (the window which is receiving user input). This change was required, because there was an attack reported to avast bug bounty program, which was using user input emulation API to deactivate protection completely. TeamViewer has signed executables, so there shouldn't be problem with TeamViewer unless you are using a warez (modified) version of TeamViewer. Also please use latest Avast 18.5 version as there were some bugs in previous releases related to this issue. I have tested latest UltraVNC 64bit and it contains signed executables too, but it is possible that afflicted computers have obsolete (unsigned) version of UltraVNC.
Thanks

Offline charlierainbow

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #17 on: July 30, 2018, 08:41:04 PM »
Spec8472: thanks. That makes a lot of sense. Here's the rub: I'm using UltraVNC 1.2.2.1 (the latest version) and Avast 18.5.2342. So the problem is appearing even with the latest version of software. Thoughts?

Offline Spec8472

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #18 on: July 31, 2018, 10:53:10 PM »
charlierainbow, can you please verify that "C:\Program Files\uvnc bvba\UltraVNC\winvnc.exe" executable really has digital signature? Is your UltraVNC  32bit or 64bit version? Thanks.

Offline charlierainbow

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #19 on: July 31, 2018, 11:47:59 PM »
Spec8472, thanks for your continued interest. I'm happy to verify. How do I do this? UltraVNC64.

Offline Spec8472

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #20 on: August 01, 2018, 12:08:02 AM »
 charlierainbow, just right click the file in windows explorer, select properties in context menu, then there should be "Digital Signatures" tab in file properties dialog. Please select it. Name of signer should be "uvnc bvba"

Offline charlierainbow

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #21 on: August 01, 2018, 03:24:48 AM »
I can confirm that the executable is signed. uvnc bvba symantec class 3 valid 2016/08/22 to 2019/11/22 signed 18/06/07 14h31:05 uvnc 1.2.2.1 build 18/06/07 20h30:40.

Offline Spec8472

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #22 on: August 01, 2018, 02:29:31 PM »
Thank you charlierainbow, unfortunately I am unable to reproduce your issue, can you please also verify that problem disappears if you disable self-defense in Avast troubleshooting settings? Can you also specify OS?

Offline bob3160

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #23 on: August 01, 2018, 02:52:52 PM »

How to get to the Avast Settings, Licenses, Rewards and, Help
Free avast! Security Seminar: http://bit.ly/2N1eaR2  -  Important: http://www.organdonor.gov/ -- My Web Site: http://bob3160.strikingly.com/ - Win 10 Pro v20H2 64bit, 24 Gig Ram, 1TB SSD, AvastOmni 20.7.xxx, How to Successfully Install Avast http://goo.gl/VLXdeRepair & Clean Install https://goo.gl/t7aJGq

Offline ProfEngr

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #24 on: July 30, 2019, 03:44:32 PM »
I've managed to get myself locked out of a PC thanks to this nice little "feature." Albeit due to me trying to turn off all the popups that were causing the problem in the first place. Using the chat window work-around gave me limited access to the system. However, when I opened the Avast app itself that no longer works and I'm unable to do anything with the PC now via UltraVNC. The chat window is now hidden behind the app and I have found no way to force it out of focus. I read in the forum that this was deemed necessary for some kind of exploit, but messing with a legitimate RDP-type program like this is really poor. Definitely so after the years of complaints showing up in the search. I was happy with AVG until your company acquired it. Then the user experience went downhill.
Why is it that after a certain amount of time almost all programs that started out strong run out of wind and collapse into a pile of crap?  :'(

Offline bob3160

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Re: Avast pop up windows blocks ultravnc teamviewer etc.
« Reply #25 on: July 30, 2019, 03:51:07 PM »
I've managed to get myself locked out of a PC thanks to this nice little "feature." Albeit due to me trying to turn off all the popups that were causing the problem in the first place. Using the chat window work-around gave me limited access to the system. However, when I opened the Avast app itself that no longer works and I'm unable to do anything with the PC now via UltraVNC. The chat window is now hidden behind the app and I have found no way to force it out of focus. I read in the forum that this was deemed necessary for some kind of exploit, but messing with a legitimate RDP-type program like this is really poor. Definitely so after the years of complaints showing up in the search. I was happy with AVG until your company acquired it. Then the user experience went downhill.
Why is it that after a certain amount of time almost all programs that started out strong run out of wind and collapse into a pile of crap?  :'(
Posting in a year old topic is senseless.
If you have a problem, start your own topic and explain your problem with as much detail as possible.
Free avast! Security Seminar: http://bit.ly/2N1eaR2  -  Important: http://www.organdonor.gov/ -- My Web Site: http://bob3160.strikingly.com/ - Win 10 Pro v20H2 64bit, 24 Gig Ram, 1TB SSD, AvastOmni 20.7.xxx, How to Successfully Install Avast http://goo.gl/VLXdeRepair & Clean Install https://goo.gl/t7aJGq