20977 : Google Search Appliance proxystylesheet File Existence Verification
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Info

Last Modified
4 months ago

Percent Complete
100%

Disclosure
Nov 21, 2005

Discovery
Jun 10, 2005

Dates

Exploit
Nov 21, 2005

Solution
Unknown

Description

 The Google Search Appliance contains a flaw that allows a remote attacker to verify the existance of a file. The issue is due to the proxystylesheet parameter in the search request, which doesn't check for a directory traversal in the file name. This allows an attacker to prepend a ../ sequence to an absolute file path and verify its existance based on the error message returned.

Classification

 Location: Remote/Network Access Required
Attack Type: Information Disclosure
Impact: Loss of Confidentiality
Exploit: Exploit Available
Disclosure: OSVDB Verified
OSVDB: Web Related

Technical

 Replace the proxystylesheet variable in the search URL with "../../../../../../../../path/to/file". The error reply for an existing file contains "The following required pattern was not found", otherwise it contains "Unable to fetch the stylesheet for collection". A patched system returns neither error.

Solution

 Upgrade to the version specified by Google advisory GA-2005-08-m, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products
Google, Inc.
Watch-list
Mini Search Appliance
Watch-list
 Unknown or Unspecified
Search Appliance
Watch-list
 Unknown or Unspecified

References

Tools & Filters

Nessus

 20241

Credit
  • H D Moore - fdlistBrand New Doo Doodigitaloffense.net - The Metasploit Project

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