#VU6608 Path traversal in Advantech WebAccess - CVE-2017-7929

Vulnerability identifier: #VU6608

Vulnerability risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green]

CVE-ID: CVE-2017-7929

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 authenticated attacker to cause DoS conditions on the target system.

The weakness exists in the odbcPg4.asp component due to insufficient validation of the path that is used for file operations. A remote attacker can traverse the file system, overwrite files on the targeted system and cause the system to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Update to version 8.2_20170330.

Vulnerable software versions

Advantech WebAccess: 8.0-2014.10.31 - 8.1_20151230

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External links
https://ics-cert.us-cert.gov/advisories/ICSA-17-124-03

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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