[Bug 1881924] [NEW] SFTP clients using the PuTTy authentication mechanism cause the "Unsupported protocol sequence" error

[Andrey de Oliveira]

Public bug reported:

Hi,

Updated SFTP clients using the PuTTy authentication mechanism like
WinSCP e Filezilla, cause the "Unsupported protocol sequence" error
during authentication on Ubuntu 16.04 and proftpd-basic 1.3.5a-
1ubuntu0.1

The bug was fixed in Proftpd 1.3.6 by the ProftpD team:.

http://bugs.proftpd.org/show_bug.cgi?id=4385

But it will not be fixed by them in Proftpd 1.3.5, which is the version
used in Ubuntu 16.04 and 18.04, because it is no longer supported

The debian versions 8 and 9, still supported, also use ProFTPD 1.3.5 and
they released a fix:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949622

Please, can we have this fix on Ubuntu 16.04 updates which is still
supported?

More related links:
https://forum.filezilla-project.org/viewtopic.php?t=51875
https://winscp.net/forum/viewtopic.php?t=28469


Thank you.

** Affects: proftpd-dfsg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1881924

Title:
  SFTP clients using the PuTTy authentication mechanism cause the
  "Unsupported protocol sequence" error

Status in proftpd-dfsg package in Ubuntu:
  New

Bug description:
  Hi,

  Updated SFTP clients using the PuTTy authentication mechanism like
  WinSCP e Filezilla, cause the "Unsupported protocol sequence" error
  during authentication on Ubuntu 16.04 and proftpd-basic 1.3.5a-
  1ubuntu0.1

  The bug was fixed in Proftpd 1.3.6 by the ProftpD team:.

  http://bugs.proftpd.org/show_bug.cgi?id=4385

  But it will not be fixed by them in Proftpd 1.3.5, which is the
  version used in Ubuntu 16.04 and 18.04, because it is no longer
  supported

  The debian versions 8 and 9, still supported, also use ProFTPD 1.3.5
  and they released a fix:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949622

  Please, can we have this fix on Ubuntu 16.04 updates which is still
  supported?

  More related links:
  https://forum.filezilla-project.org/viewtopic.php?t=51875
  https://winscp.net/forum/viewtopic.php?t=28469

  
  Thank you.

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