Advantech WebAccess Node viewsrv Arbitrary File Deletion Vulnerability
Vulnerability Details
This vulnerability allows remote attackers to delete arbitrary files on affected installations of Advantech WebAccess Node. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the implementation of the 0x2715 IOCTL in the webvrpcs process. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to delete files under the context of Administrator.
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-19-178-05
Disclosure Timeline
- 2019-03-01 - Vulnerability reported to vendor
- 2019-07-02 - Coordinated public release of advisory
Credit
Mat Powell of Trend Micro Zero Day Initiative
