This security bulletin contains one critical risk vulnerability.
Exploit availability: NoDescription
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to improper access control and incorrect validation of the szScreen field when processing file uploads within the CimWebServer component. A remote unauthenticated attacker can upload and execute arbitrary file on the target system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
Note: this vulnerability has been exploited in targeted attacks.Mitigation
The vulnerability is present in Proficy HMI/SCADA – CIMPLICITY: Version 4.01 and greater.
To resolve the issue, install Proficy HMI/SCADA – CIMPLICITY 8.2 SIM 24:
CIMPLICITY: 8.2 SIM 23CPE2.3
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.