Microsoft Office RTF Stack Buffer Overflow Remote Code Execution Vulnerability (CVE-2010-3333)
Executive & SecOps Summary
SECOPS ASSESSMENTMicrosoft Office XP SP3, 2003 SP3, 2007 SP2, 2010, and Office for Mac 2004, 2008, 2011
Remote attackers can execute arbitrary code with the privileges of the active user by tricking them into opening a crafted RTF file
Apply the official Microsoft MS10-087 security patch, or configure File Block settings via Registry to restrict RTF file parsing
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Deploy the official MS10-087 security update. For legacy environments, you can query and trigger Windows Update programmatically using the following PowerShell script to ensure all security updates are applied:
# Query missing security updates via Windows Update Agent
$UpdateSession = New-Object -ComObject Microsoft.Update.Session
$UpdateSearcher = $UpdateSession.CreateUpdateSearcher()
$SearchResult = $UpdateSearcher.Search('IsInstalled=0 and Type=Software')
Write-Output "Number of missing updates: $($SearchResult.Updates.Count)"2. Temporary Workaround & Hardening Configuration
If patching cannot be immediately performed, enforce File Block settings via the Windows Registry to prevent Microsoft Word from opening RTF files:
:: Block RTF files in Word 2010
reg add "HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Word\Security\FileOpenBlock" /v "RtfFiles" /t REG_DWORD /d 2 /f
:: Block RTF files in Word 2007
reg add "HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Security\FileOpenBlock" /v "RtfFiles" /t REG_DWORD /d 2 /f3. Log Audit & IoC Verification Commands
Use the following PowerShell script to scan user directories for suspicious, oversized RTF files that contain potential exploit vectors like shape control words:
# Scan for suspicious RTF files containing shape control words
Get-ChildItem -Path 'C:\Users' -Filter '*.rtf' -Recurse -ErrorAction SilentlyContinue | ForEach-Object {
$content = Get-Content $_.FullName -Raw -ErrorAction SilentlyContinue
if ($content -match '\\shp' -and $_.Length -gt 1MB) {
Write-Warning "Suspicious RTF file detected: $($_.FullName)"
}
}Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2010-3333) is a stack-based buffer overflow (CWE-787) residing in the Rich Text Format (RTF) parser of Microsoft Office. The root cause is the parser's failure to properly validate the length of input data when processing drawing object properties (such as shape or picture attributes) within an RTF stream, leading to an out-of-bounds write into a fixed-size stack buffer.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by crafting a malicious RTF document containing specifically malformed control words (e.g., \shp or \pib) followed by an excessively long parameter value. When a user opens or previews this document, the vulnerable Office application parses the malformed structure, overwriting the stack frame including the return address. This allows the attacker to hijack the execution flow and execute arbitrary shellcode in the context of the logged-in user.
3. Infrastructure & Business Impact
As a highly exploited vulnerability listed in the CISA KEV catalog with an EPSS score of 0.8939, this flaw has been widely leveraged in targeted spear-phishing campaigns. Successful exploitation grants the attacker full control over the victim's endpoint, potentially leading to lateral movement, credential theft, and deployment of ransomware across the enterprise network.
Official Vendor Advisories & References
Stack-based buffer overflow in Microsoft Office XP SP3, Office 2003 SP3, Office 2007 SP2, Office 2010, Office 2004 and 2008 for Mac, Office for Mac 2011, and Open XML File Format Converter for Mac allows remote attackers to execute arbitrary code via crafted RTF data, aka "RTF Stack Buffer Overflow Vulnerability."
Frequently Asked SecOps Questions (CVE-2010-3333)
FAQQ1. How critical is CVE-2010-3333 and is it actively exploited in the wild?
CVE-2010-3333 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 89.4%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2010-3333?
Primary impacted vendors include microsoft across office, office_for_mac, open_xml_file_format_converter. Scope summary: Microsoft Office XP SP3, Office 2003 SP3, Office 2007 SP2, Office 2010, Office for Mac 2004/2008/2011, and Open XML File Format Converter for Mac
Q3. What temporary mitigations or workarounds exist for CVE-2010-3333 before patching?
[Mitigation] Apply the official Microsoft MS10-087 security patch, or configure File Block settings via Registry to restrict RTF file parsing Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2010-3333
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