Microsoft Exchange calendar attachment buffer overflow

exchange-calendar-code-execution (25556) The risk level is classified as HighHigh Risk


Microsoft Exchange Server could allow a remote attacker to execute arbitrary code on the system, caused by a heap-based buffer overflow in the Collaboration Data Objects for Exchange (CDOEX) and Exchange Collaboration Data Objects (EXCDO) interfaces. By sending a specially-crafted calendar attachment containing malformed iCal or vCal properties, a remote attacker could overflow a buffer and cause the Exchange Server to crash or execute arbitrary code and possibly gain complete control of the affected system.


Gain Access


For vulnerability detection:

Enable the following checks in the ISS Protection platform:

For Virtual Patch:

Enable the following checks in the Dynamic ISS Protection platform:

For Manual Protection:

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 The original bulletin issued by Microsoft has been superseded.


Platforms Affected:

  • Microsoft Exchange Server 2000
  • Microsoft Exchange Server 2003 SP2
  • Microsoft Exchange Server 2003 SP1


May 09, 2006

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