Advisory Details

September 17th, 2019

Advantech WebAccess Node BwDlgpUp Arbitrary File Deletion Vulnerability

ZDI-19-846
ZDI-CAN-9271

CVE ID CVE-2019-13552
CVSS SCORE 5.3, AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
AFFECTED VENDORS Advantech
AFFECTED PRODUCTS WebAccess
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 BwDlgpUp.exe, which is accessed through the 0x2711 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 in 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-19-260-01
DISCLOSURE TIMELINE
  • 2019-08-09 - Vulnerability reported to vendor
  • 2019-09-17 - Coordinated public release of advisory
CREDIT Mat Powell of Trend Micro Zero Day Initiative
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