Common Vulnerability Assessment (Vulnerability Assessment) Process with URL Escape for Injection is a remote file download vulnerability that can only be executed by the attacker in a server attack. This vulnerability is often associated with Adobe Acrobat Reader and later has the potential to allow remote attackers to execute any executable file. For this reason, this type of vulnerability must be fixed before it can be exploited in an online attack.
A PDF viewer such as Adobe Acrobat Reader has several issues that will allow elevation of privilege. A maliciously written PDF file could create a valid Adobe Acrobat Reader session file containing malicious codes that execute when the user navigates to the targeted web page. The vulnerable Adobe Acrobat Reader application could return a crafted webpage, when the browser attempts to read the file. In this case, the browser would exploit the security vulnerability by interpreting the Adobe Acrobat Session ID and using it to gain temporary access to the targeted application. This allows the intruder to gain administrative privileges. In many cases, the intruder would also have full control over the targeted computer, including access to sensitive data files.
For this reason, an important feature in Adobe Acrobat Reader that minimizes security risks is the use of Portable Document Format (PDF) escape codes. These escape codes are intended to provide security by preventing malware or other harmful programs from loading files. The vulnerable application processes the escape code and displays a Windows security symbol, indicating that the file cannot be loaded. The application closes immediately, preventing further access to the file. However, a clever attacker could prevent the display of the Windows symbol and trick the user into opening the file.
To prevent attacks that rely on PDF vulnerability, every Adobe Acrobat Reader application should have a dedicated web page for handling PDF files. This page will include instructions for downloading the latest version of Adobe Acrobat and will list all of the affected files. The web page will also indicate whether the vulnerable application is actually vulnerable or not.
Apart from providing instructions on how to download and install Adobe Acrobat Reader, this web page will also contain configuration information. This configuration will allow users to specify which files should be loaded by the application and to configure various security features. Users may either deny all files or only allow a selected few. A list of the files currently loaded will appear, so that the user can choose which files should be denied or allowed. This page will be displayed when the user clicks the X button during the installation process.
Many security updates will address the vulnerabilities that were detailed in this article. An application that downloads files via the Internet will expose its system processes and files to security flaws. In a user interface, a vulnerability may allow attackers to bypass authentication. This is especially dangerous when the user is logged on to the system. These and other associated vulnerabilities should be taken very seriously.