CVE-2018-15704

published 2018-10-22

CVE-2018-15704: Advantech WebAccess 8.3.2 and below is vulnerable to a stack buffer overflow vulnerability. A remote authenticated attacker could potentially exploit this…

Priority P2 63 high 8.8 CVSS 3.0

AV N AC L PR L UI N S U C H I H A H

Advantech WebAccess 8.3.2 and below is vulnerable to a stack buffer overflow vulnerability. A remote authenticated attacker could potentially exploit this vulnerability by sending a crafted HTTP request to broadweb/system/opcImg.asp.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
advantech	advantech_webaccess	—	—
advantech	webaccess	<= 8.3.2	—

Detection & IOCs extracted from sources · hover to see the quote

url /broadweb/system/opcImg.asp↗

filename BwOpcBs.exe↗

command Bwopcbs.exe 1 <sv_value>↗

• → Attackers must first enumerate valid project and node names via /WADashboard/login?cont=dashboardViewer and /broadweb/<project>.dpj before launching the exploit. Monitor for reconnaissance access to these endpoints. ↗
• → The exploit is triggered via the RemoteWinExec function in webdobj.webdraw; monitor for unusual child process spawning from the WebAccess web server process invoking BwOpcBs.exe. ↗

• · Affected version is Advantech WebAccess/SCADA 8.3.2 and below. Upgrade beyond 8.3.2 to remediate. ↗

CVSS provenance

nvd v3.0 8.8 HIGH CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 9.0 CRITICAL AV:N/AC:L/Au:S/C:C/I:C/A:C

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