![]() Once AvastBrowserUpdate.exe is triggered by the update check functionality, the DACL is set to a misconfigured value on the crafted Update.ini and, consequently, to the target file that was previously not writable by the low-privileged attacker. Because any low-privileged user can create, delete, or modify the Update.ini file stored in this location, an attacker with low privileges can create a hard link named Update.ini in this folder, and make it point to a file writable by NT AUTHORITY\SYSTEM. Right-click the file, and then click Run As Administrator. To install the saved file, follow these steps: Double-click the file, and then click OK. If you click Save, remember the folder where you saved the file. ![]() Or, click Save to save the file to the computer. Akash Chanda (Avast) Hi Donna, I understand this must be upsetting. Click Run to install the definition update file immediately. When the update check is triggered, the elevated process cleans the ACL of the Update.ini file in %PROGRAMDATA%\Avast Software\Browser\Update\ and sets all privileges to group Everyone. The program says I need to update my virus definitions. The vulnerability is due to an insecure ACL set by the AvastBrowserUpdate.exe (which is running as NT AUTHORITY\SYSTEM) when AvastSecureBrowser.exe checks for new updates. ![]() A Local Privilege Escalation issue was discovered in Avast Secure Browser. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |