SFTP: Application Crash with Bitvise SSH

Posts: 32 · schnappi 11 Jul 2016, 19:25

SFTP works fine when connecting to most SFTP servers. However when trying to connect to a Bitvise SSH server on a Windows machine get an application crash and a dump file.

Replicated on multiple machines.

Where can the dmp file be submitted to figure out what is causing the crash? Can the dmp file be submitted here?

Posts: 7211 · Zenju 12 Jul 2016, 10:10

Please send it via email.

Posts: 32 · schnappi 12 Jul 2016, 21:58

Can you confirm that SSH passwords are not stored in in dmp files? Checked the file but much of it is transcoded so want to double check before sending.

Posts: 7211 · Zenju 13 Jul 2016, 10:41

It's possible but unlikely since the automatic crash dumps only collect stack and global data but not dynamic memory.

Posts: 32 · schnappi 15 Jul 2016, 22:30

Sent to zenju:

Let me know if you find anything interesting.

Posts: 7211 · Zenju 18 Jul 2016, 15:29

Are you able to reproduce the crash consistently?

If yes, does the following version work for you? (zlib disabled)
http://www.mediafire.com/download/4q55v6c1s9752xa/FreeFileSync_8.4_beta_Windows_Setup.exe

Posts: 32 · schnappi 19 Jul 2016, 16:37

The 8.4 beta version you provided solved the issue.

What was causing the crash if do not mind me asking?

Posts: 7211 · Zenju 19 Jul 2016, 18:38

Great to hear! It looks like a libssh2 bug in the zlib handling where the library just uses zlib without checking if it is available first. By default the Bitvise server has zlib disabled.

Posts: 32 · schnappi 19 Jul 2016, 20:10

That does make sense. Thank you.

Will the fix be included in the next stable release?

Posts: 7211 · Zenju 19 Jul 2016, 20:39

Yes, the fix will be included in the next release.