Vulnerability in Win 32 API Allows Code Execution (MS07-035)
13 Jun. 2007
This critical security update resolves a privately reported vulnerability in a Win32 API. This vulnerability could allow remote code execution or elevation of privilege if the affected API is used locally by a specially crafted application. Therefore applications that use this component of the Win32 API could be used as a vector for this vulnerability. For example, Internet Explorer uses this Win32 API function when parsing specially crafted Web pages.
* Windows Vista
* Windows Vista x64 Edition
Win32 API Vulnerability - CVE-2007-2219
A remote code execution vulnerability exists in the way that the Win32 API validates parameters. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2007-2219.
Mitigating Factors for Win32 API Vulnerability - CVE-2007-2219
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
* In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker's Web site.
* An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
Workarounds for Win32 API Vulnerability - CVE-2007-2219
Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:
Read e-mail messages in plain text format to help protect yourself from the HTML e-mail attack vector
You can help protect yourself against this vulnerability by changing your e-mail settings to read e-mail messages in plain text using Outlook 2002 and later, Outlook Express 6 and later, or Windows Mail. For information in Outlook, search plain text in Help and review Read messages in plain text. In Outlook Express, search plain text in Help and review Reducing your risk of getting e-mail viruses. In Windows Mail, search plain text in Help and review Security and privacy in Windows Mail.
Impact of Workaround: E-mail messages that are viewed in plain text format will not contain pictures, specialized fonts, animations, or other rich content. Additionally:
* The changes are applied to the preview pane and to open messages.
* Pictures become attachments so that they are not lost.
* Because the message is still in Rich Text or HTML format in the store, the object model (custom code solutions) may behave unexpectedly.