Advisory Details

July 2nd, 2019

Advantech WebAccess Node viewsrv Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-19-621
ZDI-CAN-8193

CVE ID CVE-2019-10983
CVSS SCORE 5.3, (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
AFFECTED VENDORS Advantech
AFFECTED PRODUCTS WebAccess
VULNERABILITY DETAILS

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Advantech WebAccess Node. Authentication is not required to exploit this vulnerability.

The specific flaw exists within viewsrv.dll, which is accessed through the 0x2722 IOCTL in the webvrpcs process. . The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the 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
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