UltraVNC buffer overflow vulnerability

Overview

UltraVNC viewer contains a buffer overflow vulnerability. If exploited, this vulnerability may allow an attacker to execute arbitrary code.

Description

UltraVNC viewer is a remote desktop application that allows a user to control compatible VNC servers. The UltraVNC viewer includes a listen mode that accepts connections from remote hosts.

The UltraVNC viewer contains a buffer overflow vulnerability. This vulnerability may be triggered by sending a malformed packet during the protocol negotiation phase of a VNC session.

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Impact

A remote, unauthenticated attacker may be able to execute arbitrary code.

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Solution

Upgrade
See the UltraVNC download page for information about obtaining fixed software.

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Data Stream Encryption Plugin

Using the Data Stream Encryption (DSM) plugin will prevent this vulnerability from being exploited by attackers who do not have access to the encryption key material.

Restrict access

Restricting access to a vulnerable system by using host or network based firewalls may prevent a remote attacker from exploiting this vulnerability. Microsoft Windows XP users should see the Technet article How to Configure Windows Firewall on a Single Computer and Windows Vista and Server 2008 users should refer to the Vista Technet article Getting Started with Windows Firewall with Advanced Security in Windows Vista and Windows Server 2008 for more information about configuring the Windows Firewall. Note that UltraVNC runs on ports 5500/tcp and 5400/tcp by default.

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Vendor Information

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UltraVNC __ Affected

Notified: March 04, 2008 Updated: March 15, 2008

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

See <http://forum.ultravnc.info/viewtopic.php?t=11850&gt; for more details.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23721460 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://forum.ultravnc.info/viewtopic.php?t=11850&gt;
• <http://forum.ultravnc.info/viewtopic.php?p=43529&gt;
• <http://secunia.com/advisories/28747/&gt;
• <http://www.microsoft.com/technet/security/smallbusiness/prodtech/windowsxp/cfgfwall.mspx&gt;
• <http://technet2.microsoft.com/WindowsVista/en/library/19b429b3-c32b-4cbd-ae2a-8e77f2ced35c1033.mspx?mfr=true&gt;
• http://forum.ultravnc.info/viewtopic.php?t=6005&highlight=5400

Acknowledgements

Thanks to the UltraVNC team and Secunia for information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

CVE IDs:	CVE-2008-0610
Severity Metric:	12.86 Date Public: