Advisory Details

May 18th, 2018

Advantech WebAccess Node webvrpcs drawsrv Arbitrary File Deletion Vulnerability

CVE ID	CVE-2018-7495
CVSS SCORE	7.1, AV:N/AC:M/Au:N/C:N/I:N/A:C
AFFECTED VENDORS	Advantech
AFFECTED PRODUCTS	WebAccess Node
VULNERABILITY DETAILS	This vulnerability allows remote attackers to delete arbitrary files on vulnerable 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 functionality 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://ics-cert.us-cert.gov/advisories/ICSA-18-135-01
DISCLOSURE TIMELINE	2018-02-09 - Vulnerability reported to vendor 2018-05-18 - Coordinated public release of advisory 2018-05-18 - Advisory Updated
CREDIT	Steven Seeley (mr_me) of Offensive Security

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