CVE-2011-3402 — Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the…¶
Key facts
CVE-2011-3402 is a High (8.8) vulnerability: Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-10-06), confirming active exploitation in the wild.
Actively exploited — on the CISA KEV catalog
CVE-2011-3402 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-10-06), confirming exploitation in the wild. Federal remediation deadline: 2025-10-27. Prioritise patching and deploy the detection and prevention rules below.
| CVE | CVE-2011-3402 |
| Severity | High (8.8) |
| CISA KEV | Actively exploited (added 2025-10-06) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2011/CVE-2011-3402/ |
Details¶
English | 한국어
Description¶
Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to execute arbitrary code via crafted font data in a Word document or web page, as exploited in the wild in November 2011 by Duqu, aka "TrueType Font Parsing Vulnerability."
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2011-3402 |
| CVSS Score | 8.8 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2011/CVE-2011-3402/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2011-3402
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- http://blogs.mcafee.com/mcafee-labs/the-day-of-the-golden-jackal-%E2%80%93-further-tales-of-the-stuxnet-files
- http://blogs.technet.com/b/msrc/archive/2011/11/03/microsoft-releases-security-advisory-2639658.aspx
- http://isc.sans.edu/diary/Duqu+Mitigation/11950
- http://secunia.com/advisories/49121
- http://secunia.com/advisories/49122
- http://technet.microsoft.com/security/advisory/2639658
- http://www.securelist.com/en/blog/208193197/The_Mystery_of_Duqu_Part_Two
- http://www.securitytracker.com/id?1027039
- http://www.symantec.com/connect/w32-duqu_status-updates_installer-zero-day-exploit
- http://www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/w32_duqu_the_precursor_to_the_next_stuxnet.pdf
- http://www.us-cert.gov/cas/techalerts/TA11-347A.html
- http://www.us-cert.gov/cas/techalerts/TA12-129A.html
- http://www.us-cert.gov/cas/techalerts/TA12-164A.html
- http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-291-01E.pdf
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-087
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-034
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-039
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13998
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15290
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15645
- http://blogs.mcafee.com/mcafee-labs/the-day-of-the-golden-jackal-%E2%80%93-further-tales-of-the-stuxnet-files
- http://blogs.technet.com/b/msrc/archive/2011/11/03/microsoft-releases-security-advisory-2639658.aspx
- http://isc.sans.edu/diary/Duqu+Mitigation/11950
- http://secunia.com/advisories/49121
- http://secunia.com/advisories/49122
- http://technet.microsoft.com/security/advisory/2639658
- http://www.securelist.com/en/blog/208193197/The_Mystery_of_Duqu_Part_Two
- http://www.securitytracker.com/id?1027039
- http://www.symantec.com/connect/w32-duqu_status-updates_installer-zero-day-exploit
- http://www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/w32_duqu_the_precursor_to_the_next_stuxnet.pdf
- http://www.us-cert.gov/cas/techalerts/TA11-347A.html
- http://www.us-cert.gov/cas/techalerts/TA12-129A.html
- http://www.us-cert.gov/cas/techalerts/TA12-164A.html
- http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-291-01E.pdf
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-087
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-034
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-039
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13998
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15290
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15645
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2011-3402
Generated by PoC Generator on 2026-07-11T18:45:30.274404099
Frequently asked questions¶
What is CVE-2011-3402?¶
CVE-2011-3402 is a High (8.8) vulnerability: Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-10-06), confirming active exploitation in the wild.
How do I detect CVE-2011-3402?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2011-3402?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
Is CVE-2011-3402 actively exploited?¶
Yes. CVE-2011-3402 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2025-10-06, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2025-10-27. Prioritise patching and deploy the detection and prevention rules above.
For authorized security testing and research only. See the full source and NVD record.