| Business Impact: |
Plug-ins, like ActiveX controls, are one of the top targets of malicious web exploit toolkit developers. These web exploit toolkits now account for nearly all browser-related exploits seen in the wild. The exploitation of this ActiveX control provides the attacker with the privileges of the end user, which could allow complete control over the targeted endpoint.
Any ActiveX control compiled with the vulnerable version of the ATL may be vulnerable to this issue. Software developers that have created controls with the ATL are urged to create non-vulnerable versions of their controls with the updates released today with MS09-035. |
| *CVSS: |
Base Score: |
9.3 |
| |
Access Vector: |
Network |
| Access Complexity: |
Medium |
| Authentication: |
None |
| Confidentiality Impact: |
Complete |
| Integrity Impact: |
Complete |
| Availability Impact: |
Complete |
|
|
| Adjusted Temporal Score: |
8.8 |
| |
Exploitability: |
High |
| Remediation Level: |
Official-Fix |
| Report Confidence: |
Confirmed |
| Affected Products: |
For a full list of affected versions, see references below. |
| Technical Description: |
A flaw in the Microsoft Active Template Library (ATL) allows attackers to bypass the killbit functionality in Microsoft Internet Explorer. Killbits are designed to prevent known-vulnerable ActiveX controls from loading in the browser. However, with this bypass, attackers could load a vulnerable control and gain complete access to the target system. |
| Remediation: |
Patches are available. See references for details. |
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* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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