RealVNC Remote Authentication Bypass Vulnerability

BID:17978

CVE-2006-2369 |

Info

RealVNC Remote Authentication Bypass Vulnerability

Bugtraq ID: 17978
Class: Design Error
CVE: CVE-2006-2369
Remote: Yes
Local: No
Published: May 15 2006 12:00AM
Updated: Nov 15 2007 12:36AM
Credit: Steve Wiseman discovered this vulnerability.
Vulnerable: RealVNC RealVNC Personal Edition 4.2.2
RealVNC RealVNC Personal Edition 4.2
RealVNC RealVNC Personal Edition 4.1
RealVNC RealVNC Personal Edition 4.0
RealVNC RealVNC Free Edition 4.1.1
RealVNC RealVNC Free Edition 4.1
RealVNC RealVNC Free Edition 4.0
RealVNC RealVNC Enterprise Edition 4.2.2
RealVNC RealVNC Enterprise Edition 4.2
RealVNC RealVNC Enterprise Edition 4.1
RealVNC RealVNC Enterprise Edition 4.0
Cisco IP/VC 3540/DCS 0
Not Vulnerable: RealVNC RealVNC Personal Edition 4.2.3
RealVNC RealVNC Free Edition 4.1.2
RealVNC RealVNC Enterprise Edition 4.2.3

Discussion

RealVNC Remote Authentication Bypass Vulnerability

RealVNC is susceptible to an authentication-bypass vulnerability. This issue is due to a flaw in the authentication process of the affected package.

Exploiting this issue allows attackers to gain unauthenticated, remote access to the VNC servers.

RealVNC 4.1.1 is vulnerable to this issue; other versions may also be affected.

UPDATE (May 25, 2006): Reports indicate that this issue is being actively exploited in the wild.

Exploit / POC

RealVNC Remote Authentication Bypass Vulnerability

To exploit this issue, attackers will likely modify readily available open-source VNC client software.

Exploit code is available by the reporter of this issue. It is not currently known to be publicly available.

HD Moore has provided an example using the Metasploit Framework. BL4CK has supplied a patch to VNC 4.1.1 to exploit this issue.

A scanner application is available by [email protected]. Note that Symantec has neither tested this scanner application nor verified it to be safe. Please see the references for more information.

A multi-threaded scanner application based on the [email protected] version is available from Matt Venzke. Note that Symantec has neither tested this scanner application nor verified it to be safe.

embyte has supplied a patch to VNC 4.1.1 to exploit this issue.

UPDATE: Core Security Technologies has developed a working commercial exploit for its CORE IMPACT product. This exploit is not otherwise publicly available or known to be circulating in the wild.

Solution / Fix

RealVNC Remote Authentication Bypass Vulnerability

Solution:
The vendor has released fixes to address this issue.


RealVNC RealVNC Enterprise Edition 4.1

RealVNC RealVNC Free Edition 4.1

RealVNC RealVNC Personal Edition 4.1

RealVNC RealVNC Enterprise Edition 4.0

Cisco IP/VC 3540/DCS 0

RealVNC RealVNC Free Edition 4.0

RealVNC RealVNC Personal Edition 4.0

RealVNC RealVNC Free Edition 4.1.1

References

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