Adobe Flash Player ActionScript Function Integer Overflow Vulnerability
2 Nov. 2011
Summary
Remote exploitation of an integer overflow vulnerability in Adobe Systems Inc.'s Flash Player could allow an attacker to execute arbitrary code with the privileges of the current user.
Vulnerable Systems:
* Adobe Flash Player 10.2.159.1 and prior
* Adobe Flash Player 10.2.154.28 and earlier versions for Chrome users
* Adobe Flash Player 10.2.157.51 and earlier versions for Android
The vulnerability occurs when parsing a maliciously formatted sequence of ActionScript code inside an Adobe Flash file. The problem exists in a ActionScript method of a built-in class. A certain function accepts an array object as a first parameter and uses this array's length multiplied by three for a memory allocation without any overflow checks. Then it writes the array's content into the allocated memory, which corrupts memory and leads to an exploitable condition.
Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user viewing the Web page. To exploit this vulnerability, a targeted user must load a malicious Web page that an attackers creates. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites. After the user visits the malicious Web page, no further user interaction is needed.
