#VU18973 Path traversal in WebAccess/SCADA - CVE-2019-10985

Vulnerability identifier: #VU18973

Vulnerability risk: Medium

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

CVE-ID: CVE-2019-10985

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WebAccess/SCADA
Server applications / SCADA systems

Vendor: Advantech Co., Ltd

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to lack of proper validation of a user-supplied path prior to use in file operations when processing data passed to the webvrpcs process, within the 0x2715 IOCTL. A remote attacker can send a specially crafted HTTP request and delete arbitrary files on the system while posing as an administrator.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

WebAccess/SCADA: 7.2 - 8.3.5

---

External links
https://www.us-cert.gov/ics/advisories/icsa-19-178-05
https://www.zerodayinitiative.com/advisories/ZDI-19-622/

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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