Microsoft Word 2002/2003 File Information Block Parser memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Microsoft Word 2002/2003 (Word Processing Software). It has been classified as very critical. Affected is an unknown part of the component File Information Block Parser. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Stack-based buffer overflow in Microsoft Office Word 2002 SP3 and 2003 SP3, Office 2004 and 2008 for Mac, Open XML File Format Converter for Mac, Office Word Viewer 2003 SP3, and Office Word Viewer allow remote attackers to execute arbitrary code via a Word document with a malformed File Information Block (FIB) structure, aka "Microsoft Office Word File Information Memory Corruption Vulnerability."

The weakness was released 11/10/2009 by Jun Mao with VeriSign iDefense Labs as MS09-068 as confirmed bulletin (Technet). The advisory is shared for download at This vulnerability is traded as CVE-2009-3135 since 09/10/2009. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/17/2021).

It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 42442 (MS09-068: Vulnerability in Microsoft Office Word Could Allow Remote Code Execution (976307)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l.

Upgrading eliminates this vulnerability. Applying the patch MS09-068 is able to eliminate this problem. The bugfix is ready for download at The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 9247.

The vulnerability is also documented in the databases at X-Force (53977), Tenable (42442), SecurityFocus (BID 36950†), OSVDB (59857†) and Secunia (SA37277†). Entries connected to this vulnerability are available at VDB-178561, VDB-182671, VDB-190059 and VDB-213132.







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
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Class: Memory corruption
CWE: CWE-119

Local: No
Remote: Yes

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Status: Proof-of-Concept

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Nessus ID: 42442
Nessus Name: MS09-068: Vulnerability in Microsoft Office Word Could Allow Remote Code Execution (976307)
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OpenVAS ID: 900973
OpenVAS Name: Microsoft Office Word Remote Code Execution Vulnerability (976307)
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Threat Intelligenceinfo

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Recommended: Upgrade
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Patch: MS09-068
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09/10/2009 🔍
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11/19/2009 +8 days 🔍
03/17/2021 +4136 days 🔍



Advisory: MS09-068
Researcher: Jun Mao
Organization: VeriSign iDefense Labs
Status: Confirmed

CVE: CVE-2009-3135 (🔍)

X-Force: 53977
SecurityFocus: 36950 - Microsoft Word Record Parsing Remote Stack Buffer Overflow Vulnerability
Secunia: 37277 - Microsoft Office Word File Information Block Parsing Buffer Overflow, Highly Critical
OSVDB: 59857 - Microsoft Office Word Document Malformed File Information Block (FIB) Parsing Memory Corruption
SecurityTracker: 1023158 - Microsoft Word Memory Corruption Error Lets Remote Users Execute Arbitrary Code
Vulnerability Center: 24011 - [MS09-068] Microsoft Office Word Buffer Overflow Remote Code Execution or DoS Vulnerability, Medium
Vupen: ADV-2009-3194

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Created: 11/19/2009 04:12 PM
Updated: 03/17/2021 03:57 PM
Changes: 11/19/2009 04:12 PM (93), 02/17/2017 11:16 AM (11), 03/17/2021 03:57 PM (3)
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Cache ID: 3:A6A:40


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