CVE-2019-17190— Avast Secure Browser 注入漏洞

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A Local Privilege Escalation issue was discovered in Avast Secure Browser 76.0.1659.101. 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. 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. 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. 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.

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Avast Secure Browser 注入漏洞

Avast Secure Browser 76.0.1659.101版本中存在安全漏洞，该漏洞源于AvastBrowserUpdate.exe文件所设置的ACL并不安全。攻击者可通过在%PROGRAMDATA%Avast SoftwareBrowserUpdate目录下创建名称为Update.ini的硬链接利用该漏洞获得权限。

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