Opened 14 years ago

Last modified 8 years ago

#5633 closed Bug report

Be less trusting of trusted certificates — at Initial Version

Reported by: putte Owned by:
Priority: high Component: FileZilla Client
Keywords: ssl, mitm Cc:
Component version: Operating system type: Linux
Operating system version:

Description

When FileZilla is told to trust a self-signed certificate, that certificate will be accepted for any connection. For example, if I trust a certificate from some random guy for my connection to ftp.randomguy.net, that certificate will also be treated as valid for filezilla-project.org, google.com, sourceforge.net and so on.

The certificate (or rather FileZillas trust in the certificate) ought to be bound to a specific hostname or to a specific site in the site manager.

Steps to reproduce the problem:

  1. Generate a valid self-signed certificate and configure an FTP server to use it.
  2. Connect to the server with FileZilla and choose to trust the certificate.
  3. Copy the same certificate to a different FTP server (and set it up).
  4. Connect to this second server with FileZilla.

The result: FileZilla connects without warnings to the second server, even though the certificate belongs to a completely different server.

Software versions: FileZilla 3.3.4.1, GnuTLS 2.8.6

Change History (1)

by putte, 14 years ago

Attachment: firefox-certificates.png​ added

Firefox: Preferences -> Advanced -> Encryption -> View Certificates

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