Vulnerability identifier: #VU27651

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Advantech WebAccess
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 input validation error within the implementation of IOCTL 0x0000277d in DrawSrv.dll. A remote attacker can pass specially crafted data to the application and overwrite arbitrary files on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Advantech WebAccess: 6.0-2007.06.05 - 9.0.0

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External links
http://www.zerodayinitiative.com/advisories/ZDI-20-627/

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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.