Vulnerable component: Windows
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C
CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to insufficient filtration of URIs in Shell32.dll when open applications via URL handlers (e.g. mailto:). A remote attacker can create a specially crafted URI, containing invalid sequence of % characters, trick the victim to click on it and execute arbitrary system commands with privileges of the current user.
Successful exploitation of the vulnerability results in compromise of vulnerable system.
Note: this vulnerability is being actively exploited.
- Microsoft Windows - URI Handler Command Execution [Exploit-DB]