HTC OBEX FTP directory traversal

htc-obexftp-directory-traversal (48124) The risk level is classified as MediumMedium Risk

Description:

HTC devices running Microsoft Windows Mobile could allow a remote authenticated attacker to traverse directories on the system caused by an error in obexfile.dll. An attacker could send a specially-crafted URL request to the OBEX FTP server containing "dot dot" sequences using forward-slash or backslash characters (../ or ..\) to traverse directories and upload files to folders or download files or directories outside the default Bluetooth shared folder.

*CVSS:

Base Score: 4
  Access Vector: Network
  Access Complexity: Low
  Authentication: Single
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 3.5
  Exploitability: High
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Apply the hotfix for this vulnerability, available from the HTC Web site. See References.

References:

  • BugTraq Mailing List, Mon Jan 19 2009 - 17:23:12 CST : Microsoft Bluetooth Stack OBEX Directory Traversal.
  • HTC Web site: Hotfix to enhance the security mechanism of Bluetooth service.
  • Windows Mobile Web site: Windows Mobile.
  • BID-33359: HTC OBEX FTP Service Directory Traversal Vulnerability
  • CVE-2009-0244: Directory traversal vulnerability in the OBEX FTP Service in the Microsoft Bluetooth stack in Windows Mobile 6 Professional, and probably Windows Mobile 5.0 for Pocket PC and 5.0 for Pocket PC Phone Edition, allows remote authenticated users to list arbitrary directories, and create or read arbitrary files, via a .. (dot dot) in a pathname. NOTE: this can be leveraged for code execution by writing to a Startup folder.
  • OSVDB ID: 52693: Microsoft Windows Mobile Bluetooth Stack OBEX FTP Service Traversal Arbitrary File Manipulation
  • SA33598: Microsoft Windows Mobile Bluetooth Stack OBEX Directory Traversal

Platforms Affected:

  • HTC OBEX FTP server
  • Microsoft Windows Mobile 6.0
  • Microsoft Windows Mobile 6.1

Reported:

Jan 19, 2009

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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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