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TUCoPS :: Macintosh :: bx3947.htm

Apple Mac OS X CoreGraphics PDF Type1 Font Integer Overflow Vulnerability
iDefense Security Advisory 07.31.08: Apple Mac OS X CoreGraphics PDF Type1 Font Integer Overflow Vulnerability
iDefense Security Advisory 07.31.08: Apple Mac OS X CoreGraphics PDF Type1 Font Integer Overflow Vulnerability

iDefense Security Advisory 07.31.08 
Jul 31, 2008


Mac OS X is a Unix operating system built from the XNU kernel. Mac OS X
provides all the standard Unix capabilities and tools with an
additional GUI component. For more information, see the vendor's site
found at the following link URL. 


Remote exploitation of an integer overflow vulnerability in Apple Inc.'s
Mac OS X could allow an attacker to execute arbitrary code with the
privileges of the currently logged in user.

This vulnerability exists due to the way PDF files containing Type 1
fonts are handled. When processing a font with an overly large length,
integer overflow could occur. This issue leads to heap corruption which
can allow for arbitrary code execution.


Exploitation of this issue allows an attacker to execute arbitrary code.
An attacker could exploit this issue via multiple attack vectors. The
most appealing vector for attack is Safari. An attacker could host a
malformed PDF file on a website and entice a targeted user to open a
URL. Upon opening the URL in Safari the PDF file will be automatically
parsed and exploitation will occur. While this is the most appealing
attack vector, the file can also be attached to an e-mail. Any
application which uses the Apple libraries for file open dialogs will
crash upon previewing the malformed PDF document.


iDefense has confirmed the existence of this vulnerability in Mac OS X
version 10.5.2. Previous versions may also be affected.


iDefense is currently unaware of any workarounds for this issue.


Apple addressed this vulnerability within their Mac OS X 2008-005
security update. More information is available at the following URL. 


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2008-2322 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for 
security problems.


07/09/2008  Initial vendor notification
07/10/2008  Initial vendor response
07/31/2008  Public disclosure


This vulnerability was reported to iDefense by Pariente Kobi.

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Copyright =A9 2008 iDefense, Inc.

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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
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