CVE-2020-15843 Information

Description

ActFax Version 7.10 Build 0335 (2020-05-25) is susceptible to a privilege escalation vulnerability due to insecure folder permissions on PROGRAMFILES\ActiveFax\Client\ PROGRAMFILES\ActiveFax\Install\ and PROGRAMFILES\ActiveFax\Terminal\. The folder permissions allow \Full Control\ to \Everyone. An authenticated local attacker can exploit this to replace the TSClientB.exe binary in the Terminal directory which is executed on logon for every user. Alternatively the attacker can replace any of the binaries in the Client or Install directories. The latter requires additional user interaction for example starting the client.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Reference

https://blog.to.com/advisory-actfax-7-10-build-0335-privilege-escalation-cve-2020-15843/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.3