Once the said routine finishes with AS2, it uses a matrix field of ConvolutionFilter to overwrite memory. The function overwrites TextFormat object boundary, and then it also overwrites the data after the TextFormat. In other words, it uses FileReference class method on a TextFormat object. The compare callback function calls FileReference class method by ASnative call with the “customized” TextFormat object. The attacker then creates the “customized ” TextFormat, which will trigger the overrided toString function.Īfter preparing the Array, a class in action script, an attacker calls sort function in its array, which compare callback do some action. The following shows the main activity:įigure 3: Overwrite ByteArray object ‘s length The issue in the FileReference type checking mechanism lets this happen. It will call a FileReference init function with the TextFormat instance.
Download flash player mac os x code#
FileReference constructor functionĪs seen in the code above, ASnative is the method that calls an AS2.0 object, while 2204 is the FileReference identity. One element of the TextFormat array is “customized,” wherein its “toString” function is overridden by a function, as shown in the following code:įigure 2.
Download flash player mac os x for mac os x#
As mentioned earlier, when we were analyzing the sample, we found that it contained following code slides, which specifically calls out Mac OS X:įigure 1. Code designed for Mac OS X attackīased on our investigation, this vulnerability can be exploited when an attacker prepares a ByteArray containing a TextFormat array.
It is a type confusion vulnerability which exists in Action script 2 FileReference class’s type checking mechanism.
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In addition to being present on the Windows platform, it is interesting to note it is also present on Mac OS X given that fewer exploits target the said OS.ĬVE-2016-1019 affects all versions of Adobe Flash Player but is only currently exploitable to versions 20.0.0.306 and earlier. In this post, we took a look at the exploit code. In the sample we acquired from our Smart Protection Network feedback, we observed that this vulnerability is also present in Mac OS X. We previously discussed one such attack when we discovered this vulnerability being integrated in Magnitude Exploit Kit. Adobe has just released a security update for Adobe Flash to address a vulnerability ( CVE-2016-1019) that was used in zero day attacks against older versions of Adobe Flash.
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