WeOnlyDo! Software wodSSHServer ActiveX component fails to properly validate key exchange algorithm strings

Overview

The WeOnlyDo! Software wodSSHServer ActiveX component fails to properly validate the length of key exchange algorithm strings. This may allow a remote, unauthenticated attacker to execute arbitrary code.

Description

wodSSHServer****ActiveX component

According to the wodSSHServer ActiveX component website:

wodSSHServer is an SSH Server ActiveX component (but also Telnet Server ActiveX as well) that will give you ability to easily add SSH2 (and SFTP) server capabilities to your application, as well as old TELNET server protocol.
The Problem

wodSSHServer does not validate key exchange algorithm strings supplied by a client. If a client sends a specially crafted key exchange algorithm string to a vulnerable wodSSHServer installation, that attacker may be able to trigger the overflow.

Any application that uses the wodSSHServer ActiveX Component may be affected by this vulnerability. Known instances of this are freeSSHd and freeFTPd, but there may be others.

Note that working exploit code for this vulnerability is publicly available.

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Impact

A remote attacker may be able to execute arbitrary code on the server using the wodSSHServer ActiveX component. If that server is running with administrative privileges, the attacker could gain complete control of the system.

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Solution

Upgrade

This issue is addressed in wodSSHServer ActiveX component version 1.3.4, freeSSHd version 1.0.10, and freeFTPd version 1.0.11.

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Vendor Information

477960

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WeOnlyDo! Software __ Affected

Updated: May 18, 2006

Status

Affected

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.

Addendum

Refer to http://www.weonlydo.com/index.asp?showform=SSHServer&rnotes=1.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23477960 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://secunia.com/advisories/19846/&gt;
• <http://secunia.com/advisories/19845/&gt;
• http://www.weonlydo.com/index.asp?showform=SSHServer&rnotes=1
• <http://freesshd.com/&gt;
• <http://www.freeftpd.com/&gt;

Acknowledgements

This issue was reported by Gerry Eisenhaur.

This document was written by Jeff Gennari.

Other Information

CVE IDs:	CVE-2006-2407
Severity Metric:	32.92 Date Public: