2008-0610 | UltraVNC ClientConnection.cpp negotiateprotocolversion memory corruption (BID-27561 / XFDB-40165)

CVSS Meta Temp Score

CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.

Current Exploit Price (≈)

Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.

CTI Interest Score

Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.

9.5 $0-$5k 0.40

A vulnerability, which was classified as very critical, has been found in UltraVNC 1.0.2/1.0.4/1.0.4 Rc6/1.0.4 Rc7/1.0.4 Rc8 (Connectivity Software). Affected by this issue is the function clientconnection::negotiateprotocolversion of the file vncviewer/ClientConnection.cpp. The manipulation of the argument size with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Stack-based buffer overflow in the ClientConnection::NegotiateProtocolVersion function in vncviewer/ClientConnection.cpp in vncviewer for UltraVNC 1.0.2 and 1.0.4 before 01252008, when in LISTENING mode or when using the DSM plugin, allows remote attackers to execute arbitrary code or cause a denial of service (crash) via a modified size value.

The weakness was disclosed 01/25/2008 as confirmed advisory (CERT.org). The advisory is available at kb.cert.org. This vulnerability is handled as CVE-2008-0610 since 02/05/2008. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a exploit are known. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/30/2021).

It is declared as highly functional. The exploit is available at exploit-db.com.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 27561), X-Force (40165) and Vulnerability Center (SBV-17506).



VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

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Vector Complexity Authentication Confidentiality Integrity Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Highly functional
Download: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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MetaSploit ID: ultravnc_viewer_bof.rb
MetaSploit Name: UltraVNC 1.0.2 Client (vncviewer.exe) Buffer Overflow
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: kb.cert.org
Fortigate IPS: 🔍

01/25/2008 🔍
01/25/2008 +0 days 🔍
01/25/2008 +0 days 🔍
02/01/2008 +7 days 🔍
02/03/2008 +1 days 🔍
02/05/2008 +1 days 🔍
02/06/2008 +1 days 🔍
06/05/2014 +2311 days 🔍
03/16/2015 +284 days 🔍
07/30/2021 +2328 days 🔍Advisory: kb.cert.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2008-0610 (🔍)
SecurityFocus: 27561
X-Force: 40165
Vulnerability Center: 17506 – UltraVnc Vncviewer Buffer Overflow Allows Remote Attacker to Execute Code or Cause DoS, Medium
OSVDB: 42840 – UltraVNC vncviewer/ClientConnection.cpp ClientConnection::NegotiateProtocolVersion() vncviewer Remote Overflow

Created: 03/16/2015 13:43
Updated: 07/30/2021 20:43
Changes: (2) source_securityfocus_date source_securityfocus_class
Complete: 🔍


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