Microsoft Outlook Express MHTML URL allows execution of code

outlook-mhtml-execute-code (15705) The risk level is classified as HighHigh Risk

Description:

Microsoft Outlook Express versions 5.5, 6.0, 6.0SP1, and 6.0 on Windows Server 2003 could allow a remote attacker to execute arbitrary code on the system, caused by a vulnerability when parsing MHTML files. MHTML is the defining standard for MIME (Multipurpose Internet Mail Extensions) structures used to send HTML content in the body of email messages. A remote attacker could create a specially-crafted MHTML URL containing a reference to a local file that does not exist, which would allow the attacker to execute arbitrary code in the Local Machine zone of an affected system. An attacker could exploit this vulnerability by hosting the malicious Web page on a Web site or by sending it to a victim as an HTML email. After the victim has visited the malicious Web page or viewed the email, the attacker could gain unauthorized access to files and execute arbitrary code on the victim's system with the user's privileges.


Consequences:

Gain Access

Remedy:

Apply the appropriate patch for your system, as listed in the latest Microsoft Security Bulletin. See References.

— OR —

Use Microsoft Automatic Update if it is supported by your operating system. The original bulletin issued by Microsoft has been superseded.

References:

Platforms Affected:

  • Microsoft Outlook Express 5.0
  • Microsoft Outlook Express 6.0 SP1
  • Microsoft Outlook Express 6.0
  • Microsoft Windows 2003 Server

Reported:

Apr 13, 2004

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