Advisory Details

April 8th, 2020

Advantech WebAccess/NMS saveBackgroundAction Directory Traversal Denial-of-Service Vulnerability

ZDI-20-379
ZDI-CAN-9572

CVE ID CVE-2020-10619
CVSS SCORE 8.2, (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H)
AFFECTED VENDORS Advantech
AFFECTED PRODUCTS WebAccess/NMS
VULNERABILITY DETAILS

This vulnerability allows remote attackers to delete arbitary files 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 saveBackground.action endpoint. When parsing the oldImage parameter, the process does not properly validate a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to create a denial-of-service condition on the 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
  • 2019-11-20 - Vulnerability reported to vendor
  • 2020-04-08 - Coordinated public release of advisory
CREDIT rgod of 9sg
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