[Bug 1613737] Re: Proftpd - MLSD lines not properly terminated with CRLF

[Łukasz Zemczak]

Please perform verification on this bug, otherwise in a few days it will
be removed as per the SRU policy.

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https://bugs.launchpad.net/bugs/1613737

Title:
  Proftpd - MLSD lines not properly terminated with CRLF

Status in Proftpd Dfsg:
  Fix Released
Status in proftpd-dfsg package in Ubuntu:
  Fix Released
Status in proftpd-dfsg source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * A bug exists in Proftpd version 1.3.5a. which causes FTP sessions
  to fail or timeout with strict clients

   * The package, as published in LTS, does not comply with the FTP
  protocol

   * Ported upstream patch and test changes

  [Test Case]

   * Connect to an affected server with ftptest.net

   * Prior to the patch, it will fail to perform an MLSD command with an
  explicit error and explanation

   * After the patch, this works as expected

  [Regression Potential]

   * Failures in SSL connection handling

  A bug exists in Proftpd version 1.3.5a. which causes ssl sessions to
  fail or timeout with some clients

  Excerpt from http://bugs.proftpd.org/show_bug.cgi?id=4202

  Server seems to send an improperly formatted response causing some clients to
  time out.

  Log from ftptest.net:
  [snip]
  Command: TYPE I
  Reply: 200 Type set to I
  Command: EPSV
  Reply: 229 Entering Extended Passive Mode (|||45766|)
  Command: MLSD
  Status: Data connection established.
  Reply: 150 Opening BINARY mode data connection for MLSD
  Error: Malformed directory listing
  Error: Line feed received without preceding carriage return

  This bug has been fixed upstream in version 1.3.5b I recommend getting
  this fixed this is causing a lot of havoc with my servers I've had to
  delay my rollout of 16.04 because of this.

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