Update: UltraVNC 1.4.3.6 and UltraVNC SC 1.4.3.6: https://forum.uvnc.com/viewtopic.php?t=37885
Important: Please update to latest version before to create a reply, a topic or an issue: https://forum.uvnc.com/viewtopic.php?t=37864

Join us on social networks and share our announcements:
- Website: https://uvnc.com/
- GitHub: https://github.com/ultravnc
- Mastodon: https://mastodon.social/@ultravnc
- Facebook: https://www.facebook.com/ultravnc1
- X/Twitter: https://x.com/ultravnc1
- Reddit community: https://www.reddit.com/r/ultravnc
- OpenHub: https://openhub.net/p/ultravnc

bug when copying 3gp header (as hex)

Post Reply
ro0ter
Posts: 4
Joined: 2008-09-29 12:22

bug when copying 3gp header (as hex)

Post by ro0ter »

PLEASE SOMEONE CONFIRM THE FOLLOWING BUG


steps to reproduce:

1. create a text file with the following content [ 3gp header as hex (0-9, A-F(not used in this header), space) ]:
---<file content start>---
00 00 00 20 66 74 79 70 33 67 70 35 00 00 00 00
---<file content end>---

2. install ultravnc 1.0.8.4 (latest stable i find today), configure new ms logon groups, enable encryption (SecureVNCPluginARC4.dsm), generate keys

3. go to other computer with vncviewer.exe, SecureVNCPluginARC4.dsm and Viewer_ClientAuth.pkey

4. connect to first computer

5. open the file via remote , select the above text and select copy

6. the viewer instantly closes (tried this several times)


please note: i am not sure whether it`s a viewer problem or a server problem, i might have seen two vnc server icons near the system clock, did not start ultravnc in debug.
ro0ter
Posts: 4
Joined: 2008-09-29 12:22

Re: bug when copying 3gp header (as hex)

Post by ro0ter »

i just reproduced it again. it`s definitely the server. i`ll start the server in debug, see what happens
ro0ter
Posts: 4
Joined: 2008-09-29 12:22

Re: bug when copying 3gp header (as hex)

Post by ro0ter »

sorry for not hitting edit to add info

so, it seems to be both the client and the server.

vncviewer just crashed. opened visual studio and these are the assemblies:

10005813 pop esi
10005814 pop ebx
10005815 ret
10005816 mov ecx,dword ptr [esi]
10005818 push edi
>>> 10005819 mov edi,dword ptr [ecx+4]
1000581C cmp edi,20h
1000581F jbe 10005838
10005821 push 10035E84h
10005826 push 107h
1000582B push 10035E50h
10005830 call 10004660


error: Unhandled exception at 0x10005819 in vncviewer.exe: 0xC0000005: Access violation reading location 0x00000004.

i am using wx hex editor to copy headers. seems not to work... ?!? some bug there?

still, tried to transfer the 3gp video file and i was unable to transfer it (by file transfer from remote machine to here), i only was able to transfer it after i zipped it.
Post Reply