Executive Summary

Summary
Title Adobe Reader and Acrobat font memory corruption vulnerability
Informations
Name VU#264729 First vendor Publication 2011-06-15
Vendor VU-CERT Last vendor Modification 2011-06-15
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:C/I:C/A:C)
Cvss Base Score 9.3 Attack Range Network
Cvss Impact Score 10 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Vulnerability Note VU#264729

Adobe Reader and Acrobat font memory corruption vulnerability

Overview

Adobe Reader and Acrobat fail to properly handle font data, which could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

A critical vulnerability exists in the font parsing code in Adobe Reader and Acrobat. The vulnerability results in memory corruption, which could allow for the execution of arbitrary code.

II. Impact

An attacker may use a specifically crafted PDF document to cause a crash or execute arbitrary code.

III. Solution

Apply an update

Adobe recommends all users upgrade to Adobe Reader and Acrobat 10.1, 9.4.5, or 8.3. APSB11-16 contains more details. 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.

Disable JavaScript in Adobe Reader and Acrobat

Disabling JavaScript helps to reduce attack surface and mitigates some exploitation techniques. If this workaround is applied to updated versions of Adobe Reader and Acrobat, it may protect against future vulnerabilities.

To disable JavaScript in Adobe Reader:

  1. Open Adobe Acrobat Reader.
  2. Open the Edit menu.
  3. Choose the Preferences... option.
  4. Choose the JavaScript section.
  5. Uncheck the Enable Acrobat JavaScript checkbox.
Note that when JavaScript is disabled, Adobe Reader and Acrobat prompt to re-enable JavaScript when opening a PDF that contains JavaScript.

Prevent Internet Explorer from automatically opening PDF documents


The installer for Adobe Reader and Acrobat configures Internet Explorer to automatically open PDF files without any user interaction. This behavior can be reverted to the safer option of prompting the user by importing the following as a .REG file:
    Windows Registry Editor Version 5.00

    [HKEY_CLASSES_ROOTAcroExch.Document.7]
    "EditFlags"=hex:00,00,00,00
Disable the displaying of PDF documents in the web browser

Preventing PDF documents from opening inside a web browser reduces attack surface. If this workaround is applied to updated versions of Adobe Reader and Acrobat, it may protect against future vulnerabilities.

To prevent PDF documents from automatically being opened in a web browser with Adobe Reader:
  1. Open Adobe Acrobat Reader.
  2. Open the Edit menu.
  3. Choose the Preferences... option.
  4. Choose the Internet section.
  5. Uncheck the Display PDF in browser checkbox.

Vendor Information

VendorStatusDate NotifiedDate Updated
AdobeAffected2010-11-292011-06-15

References

http://www.adobe.com/support/security/bulletins/apsb11-16.html
http://www.microsoft.com/download/en/details.aspx?id=1677
http://blogs.technet.com/b/srd/archive/2009/06/05/understanding-dep-as-a-mitigation-technology-part-1.aspx
http://blogs.technet.com/b/srd/archive/2009/06/12/understanding-dep-as-a-mitigation-technology-part-2.aspx
http://blogs.technet.com/b/srd/archive/2010/12/08/on-the-effectiveness-of-dep-and-aslr.aspx

Credit

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

This document was written by Will Dormann.

Other Information

Date Public:2011-06-14
Date First Published:2011-06-15
Date Last Updated:2011-06-15
CERT Advisory: 
CVE-ID(s):CVE-2011-2105
NVD-ID(s):CVE-2011-2105
US-CERT Technical Alerts: 
Severity Metric:21.87
Document Revision:10

Original Source

Url : http://www.kb.cert.org/vuls/id/264729

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-119 Failure to Constrain Operations within the Bounds of a Memory Buffer

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:13960
 
Oval ID: oval:org.mitre.oval:def:13960
Title: Adobe Reader and Acrobat 8.x before 8.3, 9.x before 9.4.5, and 10.x before 10.1 on Windows and Mac OS X allow attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via crafted font data.
Description: Adobe Reader and Acrobat 8.x before 8.3, 9.x before 9.4.5, and 10.x before 10.1 on Windows and Mac OS X allow attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via crafted font data.
Family: windows Class: vulnerability
Reference(s): CVE-2011-2105
Version: 13
Platform(s): Microsoft Windows 7
Microsoft Windows Server 2008
Microsoft Windows Vista
Microsoft Windows Server 2003
Microsoft Windows XP
Microsoft Windows 2000
Product(s): Adobe Acrobat
Adobe Reader
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 36
Application 35

OpenVAS Exploits

Date Description
2011-07-01 Name : Adobe Reader and Acrobat Multiple BOF Vulnerabilities June-2011 (Windows)
File : nvt/gb_adobe_prdts_mult_bof_vuln_jun11_win.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
73067 Adobe Reader / Acrobat Font Handling Memory Corruption

A memory corruption flaw exists in Adobe Reader and Acrobat. The programs fail to sanitize user-supplied input resulting in memory corruption. With a specially crafted font, a context-dependent attacker can execute arbitrary code.

Snort® IPS/IDS

Date Description
2014-01-10 Adobe Acrobat Reader CIDFont dictionary glyph width corruption attempt
RuleID : 19251 - Revision : 12 - Type : FILE-PDF

Nessus® Vulnerability Scanner

Date Description
2011-11-09 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2011-1434.nasl - Type : ACT_GATHER_INFO
2011-06-24 Name : The version of Adobe Reader on the remote Mac OS X host is affected by multip...
File : macosx_adobe_reader_apsb11-16.nasl - Type : ACT_GATHER_INFO
2011-06-15 Name : The version of Adobe Acrobat on the remote Windows host is affected by multip...
File : adobe_acrobat_apsb11-16.nasl - Type : ACT_GATHER_INFO
2011-06-15 Name : The version of Adobe Reader on the remote Windows host is affected by multipl...
File : adobe_reader_apsb11-16.nasl - Type : ACT_GATHER_INFO

Alert History

If you want to see full details history, please login or register.
0
Date Informations
2014-02-17 12:07:40
  • Multiple Updates