Vulnerability Note VU#953241

Oracle Outside In Microsoft Access 1.x parser stack buffer overflow

Original Release date: 16 Oct 2013 | Last revised: 28 Apr 2014


Oracle Outside In contains a stack buffer overflow vulnerability in the Microsoft Access 1.x database file parser, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.


Oracle Outside In is a set of libraries that can decode over 500 different file formats. Originally written by Stellent, Outside In is now part of Oracle. The Oracle Outside In libraries are used by a variety of applications, including Microsoft Exchange, Google Search Appliance, Oracle Fusion Middleware, Guidance Encase Forensics, AccessData FTK, and Novell Groupwise.

The Outside In library for processing Microsoft Access 1.x data contains a stack buffer overflow vulnerability (CWE-121). On Microsoft Windows platforms, this capability is provided by the library vsacs.dll. Versions older than and are affected.


By causing an application to process a specially-crafted file with the Oracle Outside In library, a remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the vulnerable application. Depending on what application is using Outside In, this may happen as the result of some user interaction, such as single-clicking on a file, or it may happen with no user interaction at all.


Apply an update

This vulnerability is addressed in the Oracle Fusion Middleware Critical Patch Update - October 2013. This update provides versions and of the Microsoft Access 1.x parsing library. Note that Oracle has indicated that Outside In versions older than 8.4.0 are no longer supported. Please also consider the following workarounds.

Use the Microsoft Enhanced Mitigation Experience Toolkit

The Microsoft Enhanced Mitigation Experience Toolkit (EMET) can be used to help prevent exploitation of this and other vulnerabilities.

Enable DEP in Microsoft Windows

Consider enabling Data Execution Prevention (DEP) in supported versions of Windows. DEP should not be treated as a complete workaround, but it can mitigate the execution of attacker-supplied code in some cases. Microsoft has published detailed technical information about DEP in Security Research & Defense blog posts "Understanding DEP as a mitigation technology" part 1 and part 2. DEP should be used in conjunction with the application of patches or other mitigations described in this document.

Note that when relying on DEP for exploit mitigation, it is important to use a system that supports Address Space Layout Randomization (ASLR) as well. ASLR is not supported by Windows XP or Windows Server 2003 or earlier. ASLR was introduced with Microsoft Windows Vista and Windows Server 2008. Please see the Microsoft SRD blog entry: On the effectiveness of DEP and ASLR for more details.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
AccessDataAffected16 Oct 201316 Oct 2013
ACD Systems InternationalAffected-16 Oct 2013
AvantstarAffected-16 Oct 2013
AviraAffected-16 Oct 2013
Cisco Systems, Inc.Affected16 Oct 201316 Oct 2013
Good TechnologyAffected16 Oct 201316 Oct 2013
GoogleAffected-01 Apr 2014
Guidance Software, Inc.Affected16 Oct 201316 Oct 2013
Hewlett-Packard CompanyAffected16 Oct 201316 Oct 2013
IBM CorporationAffected16 Oct 201329 Jan 2014
Kamel SoftwareAffected-16 Oct 2013
kcuraAffected16 Oct 201316 Oct 2013
Kroll Ontrack IncAffected16 Oct 201316 Oct 2013
LucionAffected16 Oct 201316 Oct 2013
MarkLogic CorporationAffected16 Oct 201316 Oct 2013
If you are a vendor and your product is affected, let us know.View More »

CVSS Metrics (Learn More)

Group Score Vector
Base 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal 8.3 E:F/RL:OF/RC:C
Environmental 6.2 CDP:ND/TD:M/CR:ND/IR:ND/AR:ND



This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

Other Information

  • CVE IDs: CVE-2013-5791
  • Date Public: 15 Oct 2013
  • Date First Published: 16 Oct 2013
  • Date Last Updated: 28 Apr 2014
  • Document Revision: 27


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