cryptcat does not encrypt data communications when -e command argument is used

ID VU:165099
Type cert
Reporter CERT
Modified 2004-02-23T22:05:00



With certain options used, cryptcat does not encrypt network connections as expected.


Cryptcat is an enhanced version of netcat that adds twofish encryption.

If cryptcat is started in listen (server) mode binding a shell to a network port, cryptcat fails to enable encryption. Without encryption enabled on the server, cryptcat clients will not be able to connect. Furthermore, netcat clients can connect to the server port and communicate without encryption.


Users may open unencrypted ports on the server with the assumption that any connections to that port will be encrypted by cryptcat.


The CERT/CC is currently unaware of a practical solution to this problem.


Vendor Information


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Farm9 Unknown

Updated: December 11, 2001



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

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Thanks to Eric Sheesley for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

CVE IDs: | None
Severity Metric: | 0.09
Date Public: | 2002-03-02
Date First Published: | 2002-03-03
Date Last Updated: | 2004-02-23 22:05 UTC
Document Revision: | 13