Advisory Details

April 8th, 2020

Advantech WebAccess/NMS SupportDeviceaddAction Arbitrary File Upload Remote Code Execution Vulnerability

ZDI-20-397
ZDI-CAN-9602

CVE ID CVE-2020-10621
CVSS SCORE 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Advantech
AFFECTED PRODUCTS WebAccess/NMS
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Advantech WebAccess/NMS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of calls to the SupportDeviceaddAction.action endpoint. When parsing the data element, the process does not properly validate user-supplied data, which can allow for the upload of arbitrary files. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.

ADDITIONAL DETAILS Advantech has issued an update to correct this vulnerability. More details can be found at:
https://www.us-cert.gov/ics/advisories/icsa-20-098-01
DISCLOSURE TIMELINE
  • 2019-11-22 - Vulnerability reported to vendor
  • 2020-04-08 - Coordinated public release of advisory
CREDIT rgod of 9sg
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