Advisory Details

May 18th, 2018

Advantech WebAccess NMS DownloadAction Servlet Directory Traversal Information Disclosure Vulnerability

CVE ID	CVE-2018-7503
CVSS SCORE	7.8, AV:N/AC:L/Au:N/C:C/I:N/A:N
AFFECTED VENDORS	Advantech
AFFECTED PRODUCTS	WebAccess
VULNERABILITY DETAILS	This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Advantech WebAccess NMS. Authentication is not required to exploit this vulnerability. The specific flaw exists within the DownloadAction servlet. When parsing the filename and taskname parameters, the process does not properly validate a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to disclose sensitive information under the context of SYSTEM.
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	2017-12-08 - Vulnerability reported to vendor 2018-05-18 - Coordinated public release of advisory 2018-05-18 - Advisory Updated
CREDIT	rgod

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