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CVE-2017-5152: Advantech Webaccess: Authentication bypass

CVE-2017-5152 is rated critical with a CVSS v3.0 base score of 9.1 and affects Advantech Webaccess. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.

Vulnerability description

An issue was discovered in Advantech WebAccess Version 8.1. By accessing a specific uniform resource locator (URL) on the web server, a malicious user is able to access pages unrestricted (AUTHENTICATION BYPASS).

Severity breakdown

CVSS v3.0 9.1: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

• Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
• Attack complexity: Low. No special conditions; the attack can be repeated reliably.
• Privileges required: None. No account or prior access is needed.
• User interaction: None. No action from any user is needed.
• Scope: Unchanged. Impact stays within the vulnerable component.
• Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
• Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
• Availability impact: None. No effect on availability.

Underlying weakness

CWE-287: Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Affected products

• Advantech Webaccess: 8.1

References

• https://ics-cert.us-cert.gov/advisories/ICSA-17-012-01
• http://www.securityfocus.com/bid/95410
• https://www.tenable.com/security/research/tra-2017-04