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Workaround for Microsoft Embedded OpenType Font Heap Overflow Vulnerability (MS10-001)

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Check Point Reference: SBP-2010-03
Date Published:
Preemptive Since:
Severity:
Source: Microsoft Security Bulletin MS10-001
Industry Reference(s): CVE-2010-0018
Protection Provided by: Security Gateway
  • R70
VPN-1
  • NGX R65
VSX
  • NGX R65
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Microsoft Windows 2000 SP4
Windows XP SP2
Windows XP SP3
Windows XP Professional x64 Edition SP2
Windows Server 2003 SP2
Windows Server 2003 x64 Edition SP2
Windows Server 2003 with SP2 (Itanium)
Windows Vista
Windows Vista SP1
Windows Vista SP2
Windows Vista x64 Edition
Windows Vista x64 Edition SP1
Windows Vista x64 Edition SP2
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for 32-bit Systems SP2
Windows Server 2008 for x64-based Systems
Windows Server 2008 for x64-based Systems SP2
Windows Server 2008 (Itanium)
Windows Server 2008 (Itanium) SP2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 (Itanium)
Vulnerability Description
A remote code execution vulnerability has been reported in the way that the Microsoft Windows Embedded OpenType (EOT) Font Engine decompresses specially crafted EOT fonts. EOT fonts are a compact form of fonts designed for use on web pages. A remote attacker can exploit this vulnerability via a specially crafted EOT file. Successful exploitation may allow execution of arbitrary code on a vulnerable system.
Update/Patch Available
Apply patches:
Microsoft Security Bulletin MS10-001
Vulnerability Details
The vulnerability is due to an integer overflow in the Embeded OpenType Font Engine when it decompresses specially crafted files and content containing embedded fonts. A remote attacker may exploit this issue via a malformed EOT file. Successful exploitation of this issue allows execution of arbitrary code once the malformed file is being opened or previewed on an affected system.

Protection Overview
This protection detects and blocks the transferring of EOT files over HTTP. No update is required to address this vulnerability.

Since the protection offered in this advisory may degrade performance and block access to legitimate files, users are advised to use this protection as a workaround till all systems are patched.

Users are protected against this vulnerability if the Protection against Microsoft Windows Embedded Web Fonts Buffer Overflow addressed in CPAI-2006-010 has been applied.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R70

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > Application Intelligence > Content Protection.
2. In the right pane, double-click the EOT Files protection.
3. In the Protection Details window, click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings.
4. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: Content Protection Violation
Attack Information: EOT file

VPN-1 NGX R65 & VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > Content Protection.
2. Select the following protection:

Block EOT files

3. In the configuration pane, under Settings > Mode, check Active.
4. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: Content Protection Violation
Attack Information: EOT file blocked

IPS-1 & IPS-1 NGX R65

How Can I Protect My Network?
1. In the IPS-1 Policy Manager, click on the Protection tab.
2. In the Protection tree, click Application Intelligence > Badfiles, and select the Filename Recorder protection group.
3. Click User-defined badfile seen (IPS-1 NGX R65 only).
4. In the configuration pane, under Settings, check Active.
5. Click on Install Policy.

How Do I Know if My Network is Under Attack?
Upon attack, the following entries will be logged:

Alert Name: BADFILENAME
Description: User-defined badfile seen