Multiple vulnerabilities in Advantech WebAccess/SCADA



| Updated: 2019-09-19
Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2019-3940
CVE-2019-3941
CWE-ID CWE-434
CWE-284
Exploitation vector Network
Public exploit N/A
Vulnerable software
 WebAccess/SCADA
Server applications / SCADA systems

Vendor Advantech Co., Ltd

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Arbitrary file upload

EUVDB-ID: #VU21206

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-3940

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to the "webvrpcs.exe" accepts unauthenticated RPC calls to perform remote file operations including fopen, fseek, ftell, fread, fwrite and fclose. A remote attacker can send a specially crafted RPC call to the application, upload and execute arbitrary file on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WebAccess/SCADA: 8.3.3 - 8.3.4

CPE2.3 External links

https://www.tenable.com/security/research/tra-2019-15


Q & A

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?

No. We are not aware of malware exploiting this vulnerability.

2) Improper access control

EUVDB-ID: #VU21207

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-3941

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to the "webvrpcs.exe" accepts unauthenticated RPC calls to perform remote file operations including fopen, fseek, ftell, fread, fwrite, and fclose. A remote attacker can send a specially crafted IOCTL 10005 RPC call to the application, bypass implemented security restrictions and download arbitrary files from the remote host.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WebAccess/SCADA: 8.3.4

CPE2.3 External links

https://www.tenable.com/security/research/tra-2019-15


Q & A

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?

No. We are not aware of malware exploiting this vulnerability.



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