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Adobe Shockwave TextXtra Allocator Integer Overflow Remote Code Execution

Adobe Shockwave TextXtra Allocator Integer Overflow Remote Code Execution
Posted Aug 26, 2010
Authored by Aaron Portnoy, Logan Brown, Team Montreal Hotties | Site dvlabs.tippingpoint.com

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Adobe Shockwave Player. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists due to a faulty allocation routine within the TextXtra.x32 module. This allocator allocates a buffer on the heap based on arithmetic involving a number of elements and a size of an individual element. As the fields come from the file, if either of them are large enough, the value used for the number of bytes to allocate can be made to overflow. As the return value is rarely checked any caller of this function can usually be made to overflow the returned buffer with user-supplied data. An attacker can leverage this to execute remote code under the context of the user running the browser.

tags | advisory, remote, overflow, arbitrary
advisories | CVE-2010-2879
MD5 | 1efcb63386c705f3ba2d992f8651326a

Adobe Shockwave TextXtra Allocator Integer Overflow Remote Code Execution

Change Mirror Download
TPTI-10-12: Adobe Shockwave TextXtra Allocator Integer Overflow Remote Code Execution Vulnerability
http://dvlabs.tippingpoint.com/advisory/TPTI-10-12
August 24, 2010

-- CVE ID:
CVE-2010-2879

-- CVSS:
9, (AV:N/AC:L/Au:N/C:P/I:P/A:C)

-- Affected Vendors:
Adobe

-- Affected Products:
Adobe Shockwave Player

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Adobe Shockwave Player. User interaction is
required to exploit this vulnerability in that the target must visit a
malicious page or open a malicious file.

The specific flaw exists due to a faulty allocation routine within the
TextXtra.x32 module. This allocator allocates a buffer on the heap based
on arithmetic involving a number of elements and a size of an individual
element. As the fields come from the file, if either of them are large
enough, the value used for the number of bytes to allocate can be made
to overflow. As the return value is rarely checked any caller of this
function can usually be made to overflow the returned buffer with
user-supplied data. An attacker can leverage this to execute remote code
under the context of the user running the browser.

-- Vendor Response:
Adobe has issued an update to correct this vulnerability. More
details can be found at:

http://www.adobe.com/support/security/bulletins/apsb10-20.html

-- Disclosure Timeline:
2010-08-11 - Vulnerability reported to vendor
2010-08-24 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
* Aaron Portnoy, Logan Brown, and Team Montreal Hotties

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