Microsoft Exchange UTF character set cross-site scripting

exchange-utf-xss (33887) The risk level is classified as MediumMedium Risk

Description:

Microsoft Exchange is vulnerable to cross-site scripting, caused by an improperly marked UTF character set label in Outlook Web Access. A remote attacker could exploit this vulnerability by sending a specially-crafted email with a UTF encoded attachment which would be executed in a victim's Web browser within the security context of the hosting Web site, once the email is viewed. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.

*CVSS:

Base Score: 4.2
  Access Vector: Remote
  Access Complexity: High
  Authentication: Not Required
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3.7
  Exploitability: High
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

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 The original bulletin issued by Microsoft has been superseded.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:

  • Microsoft Security Bulletin MS07-026: Vulnerabilities in Microsoft Exchange Could Allow Remote Code Execution (931832).
  • Microsoft Security Bulletin MS07-026: Vulnerabilities in Microsoft Exchange Could Allow Remote Code Execution (931832).
  • ASA-2007-191: MS07-026 Vulnerabilities in Microsoft Exchange Could Allow Remote Code Execution (931832)
  • BID-23806: Microsoft Outlook Web Access Remote Script Injection Vulnerability
  • CVE-2007-0220: Cross-site scripting (XSS) vulnerability in Outlook Web Access (OWA) in Microsoft Exchange Server 2000 SP3, and 2003 SP1 and SP2 allows remote attackers to execute arbitrary scripts, spoof content, or obtain sensitive information via certain UTF-encoded, script-based e-mail attachments, involving an incorrectly handled UTF character set label.
  • OSVDB ID: 34389: Microsoft Exchange Outlook Web Access (OWA) Attachment Script Injection
  • SA25183: Microsoft Exchange Multiple Vulnerabilities
  • SECTRACK ID: 1018015: Microsoft Exchange Base64, iCal, IMAP, and Attachment Processing Bugs Let Remote Users Deny Service or Execute Arbitrary Code
  • US-CERT VU#124113: Microsoft Exchange Outlook Web Access UTF character set label script injection vulnerability

Platforms Affected:

  • Microsoft Exchange Server 2000 SP3
  • Microsoft Exchange Server 2003 SP2
  • Microsoft Exchange Server 2003 SP1
  • Microsoft Windows Vista

Reported:

May 08, 2007

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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