[NET-579] SSL/TLS SocketClients do not verify the hostname against the certificate

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.3
• Fix Version/s: 3.4
• Component/s: FTP, IMAP, POP3, SMTP
• Labels: security

Environment

Java 1.7 (earlier versions cannot verify the hostname)

• Flags: Patch
• Assignee: Unassigned
• Reporter: Simon Arlott
• Created: 22/Aug/15 09:14
• Updated: 26/Nov/15 16:37
• Resolved: 24/Aug/15 00:25

Description

Every subclass of SocketClient that does SSL/TLS will never verify the hostname of the server against the certificate. This means that any valid certificate for any CA in the default trust store will be accepted without error.

SocketClient should be modified to store the hostname, and SMTPSClient/FTPSClient/IMAPSClient/POP3SClient should use it when negotiating SSL/TLS.

Java 1.7 has support for verifying the hostname if SSLParameters.setEndpointIdentificationAlgorithm("HTTPS") is used.