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Category:   Application (Web Browser)  >   Apple Safari Vendors:   Apple Computer
(Apple Issues Fix for Safari) Mac OS X Heap Overflow in PCRE Library Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1018496
SecurityTracker URL:  http://securitytracker.com/id/1018496
CVE Reference:   CVE-2007-3742, CVE-2007-3944   (Links to External Site)
Date:  Aug 1 2007
Impact:   Execution of arbitrary code via network, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.0.2 and prior versions
Description:   A vulnerability was reported in Mac OS X. A remote user can cause arbitrary code to be executed on the target user's system. A remote user can spoof a site URL. Apple Safari is affected.

A remote user can create specially crafted HTML that, when loaded by the target user, will trigger a heap overflow in the Perl Compatible Regular Expressions (PCRE) library used by the Safari JavaScript engine and execute arbitrary code on the target system [CVE-2007-3944]. The code will run with the privileges of the target user.

Apple credits Charlie Miller and Jake Honoroff of Independent Security Evaluators with reporting these vulnerabilities.

A remote user can create a specially crafted URL containing International Domain Name (IDN) support and Unicode fonts that, when loaded by the target user, will direct the user to a spoofed site [CVE-2007-3742].

Apple credits Tomohito Yoshino of Business Architects Inc. with reporting this vulnerability.

Impact:   A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system or spoof the user interface.

A remote user can spoof a site URL.

Solution:   Apple has issued a fix as part of Safari 3 Beta Update 3.0.3, available via the Apple Software Update application, or Apple's Safari download site at:

http://www.apple.com/safari/download/

For Mac OS X
The download file is named: "Safari3Beta.dmg"
Its SHA-1 digest is: d4fa5d950812de95d9c7fc5b8d24d0fef2daa057

Safari for Windows XP or Vista
The download file is named: "SafariSetup.exe"
Its SHA-1 digest is: c141abd6ff0bfae9bc40e23dd33110c0d48816ad

Safari+QuickTime for Windows XP or Vista
The download file is named: "SafariQuickTimeSetup.exe"
Its SHA-1 digest is: a2a2710e80925e46804d47cfc896bfffc3cab48b

The Apple advisory is available at:

http://docs.info.apple.com/article.html?artnum=306174

Vendor URL:  docs.info.apple.com/article.html?artnum=306174 (Links to External Site)
Cause:   Boundary error, Input validation error
Underlying OS:   UNIX (OS X), Windows (Vista), Windows (XP)

Message History:   This archive entry is a follow-up to the message listed below.
Aug 1 2007 Mac OS X Heap Overflow in PCRE Library Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Date:  Tue, 31 Jul 2007 17:24:29 -0700
Subject:  APPLE-SA-2007-07-31 Safari 3 Beta Update 3.0.3


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

APPLE-SA-2007-07-31 Safari 3 Beta Update 3.0.3

Safari 3 Beta Update 3.0.3 is now available and addresses the
following issues:

Safari
CVE-ID: CVE-2007-3743
Available for: Windows XP or Vista
Impact: Adding bookmarks may lead to an unexpected application
termination or arbitrary code execution
Description: A stack buffer overflow vulnerability exists in Safari's
bookmark handling. By enticing a user to add a bookmark with an
overlong title, an attacker may trigger the issue which may lead to
an unexpected application termination or arbitrary code execution.
This update addresses the issue by performing proper bounds checking.
This issue does not affect Mac OS X systems.

WebKit
CVE-ID: CVE-2007-2408
Available for: Mac OS X v10.4.9 or later, Windows XP or Vista
Impact: Visiting a malicious website may allow Java applets to load
and run even when Java is disabled
Description: Safari provides an "Enable Java" preference, which when
unchecked should prevent the loading of Java applets. By default,
Java applets are allowed to be loaded. Navigating to a maliciously
crafted web page may allow a Java applet to be loaded without
checking the preference. This update addresses the issue through a
stricter check of the "Enable Java" preference. Credit to Rhys Kidd
and Scott Wilde for reporting this issue.

WebKit
CVE-ID: CVE-2007-3742
Available for: Mac OS X v10.4.9 or later, Windows XP or Vista
Impact: Look-alike characters in a URL could be used to masquerade a
website
Description: The International Domain Name (IDN) support and Unicode
fonts embedded in Safari could be used to create a URL which contains
look-alike characters. These could be used in a malicious web site to
direct the user to a spoofed site that visually appears to be a
legitimate domain. This update addresses the issue by through an
improved domain name validity check. Credit to Tomohito Yoshino
of Business Architects Inc. for reporting this issue.

WebKit
CVE-ID: CVE-2007-3944
Available for: Mac OS X v10.4.9 or later, Windows XP or Vista
Impact: Viewing a maliciously crafted web page may lead to arbitrary
code execution
Description: Heap buffer overflows exist in the Perl Compatible
Regular Expressions (PCRE) library used by the JavaScript engine in
Safari. By enticing a user to visit a maliciously crafted web page,
an attacker may trigger the issues, which may lead to arbitrary code
execution. This update addresses the issues by performing additional
validation of JavaScript regular expressions. Credit to Charlie
Miller and Jake Honoroff of Independent Security Evaluators for
reporting these issues.

Safari 3 Beta Update 3.0.3 is available via the Apple Software Update
application, or Apple's Safari download site at:
http://www.apple.com/safari/download/

For Mac OS X
The download file is named:  "Safari3Beta.dmg"
Its SHA-1 digest is:  d4fa5d950812de95d9c7fc5b8d24d0fef2daa057

Safari for Windows XP or Vista
The download file is named:  "SafariSetup.exe"
Its SHA-1 digest is:  c141abd6ff0bfae9bc40e23dd33110c0d48816ad

Safari+QuickTime for Windows XP or Vista
The download file is named:  "SafariQuickTimeSetup.exe"
Its SHA-1 digest is:  a2a2710e80925e46804d47cfc896bfffc3cab48b

This message is signed with Apple's Product Security PGP key,
and details are available at:
http://www.apple.com/support/security/pgp/

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