|Number of vulnerabilities||1|
|Public exploit||Public exploit code for vulnerability #1 is available.|
Avast Secure Browser
Client/Desktop applications / Web browsers
|Vendor||Avast Software s.r.o.|
This security bulletin contains one low risk vulnerability.
CWE-65 - Windows hard link
Exploit availability: YesDescription
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to software sets insecure permission to
C:\ProgramData\AVAST SOFTWARE\Browser\Update\Update.ini file. This file is used during application update procedure and its permissions are replaced by the "AvastBrowserUpdate.exe" program, which runs under "NT AUTHORITY\SYSTEM" account. A local user can create a hard link from the Update.ini file to any file on the system and replace permissions of arbitrary file.
Successful exploitation of the vulnerability may allow an attacker to escalate privileges on the system.Mitigation
Install updates from vendor's website.Vulnerable software versions
Avast Secure Browser: 70.1.973.111 - 76.0.1659.101
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.