Adobe Flash Player sequence code execution

Notification Type: IBM Security Solutions Protection Alert
Notification Date: March 05, 2012
Notification Version: 1.0
Name: Adobe Flash Player sequence code execution
Public disclosure/
In the wild date:
August 09, 2011
Aliases: APSB11-21
CVE: CVE-2011-2140

Adobe Flash Player version  and earlier are vulnerable to a buffer overflow which can be exploited to gain remote code execution in the context of the browser.


ISS Coverage

Product Content Version
Proventia Network IDS
Proventia Network IPS
Proventia Network MFS
Proventia Server (Linux)
RealSecure Network
RealSecure Server Sensor
Proventia Desktop
Proventia Server IPS (Windows)
Propagation Techniques ISS Protection Available

remote exploit

05 Mar 2012
11 Apr 2007
10 Feb 2009

* This signature is blocked in the default policy.

In addition to the signature releasing today, we have found that the pre-existing signatures, MOV_Container_Overflow and QuickTime_Atom_Too_Small, will also block known samples of this attack. These signatures (MOV_Container_Overflow and QuickTime_Atom_Too_Small) are part of the IBM Security ahead-of-the-threat technologies that aid in 0-day attack prevention.


Detailed Description

Business Impact:

Adobe Flash Player could allow a remote attacker to execute arbitrary code on the system, caused by an error in the sequenceParameterSetNALUnit component. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability to corrupt memory and execute arbitrary code on the system.

*CVSS Base Score: 9.3
  Access Vector: Network
Access Complexity: Medium
Authentication: None
Confidentiality Impact: Complete
Integrity Impact: Complete
Availability Impact: Complete
Adjusted Temporal Score: 7.7
  Exploitability: Functional
Remediation Level: Official-Fix
Report Confidence: Confirmed
Affected Products:

For a full list of affected versions, see references below.

Technical Description:

Adobe Flash Player version  and earlier are vulnerable to a buffer overflow which can be exploited to gain remote code execution in the context of the browser.   The vulnerability is in the code responsible for parsing h.264 data from an mp4 file.  The value for the num_ref_frames_in_pic_order_cnt_cycle isn't checked and allows user controlled data to be written past a buffer onto the stack.  Adobe released an updated Flash Player, version, in August of last year that addressed this problem.  Exploits for this issue have been actively seen in the wild and have recently become publicly available.  It is advised to immediately upgrade Adobe Flash Player to the most recent version.


Refer to APSB11-21 for patch, upgrade or suggested workaround information. See References.



Revision History

1.0 Initial publication.

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