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CVE-2018-18471: Axentra Hipserv: Server-side request forgery

CVE-2018-18471 is rated critical with a CVSS v3.0 base score of 9.8 and NVD lists Axentra Hipserv as the affected product. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

/api/2.0/rest/aggregator/xml in Axentra firmware, used by NETGEAR Stora, Seagate GoFlex Home, and MEDION LifeCloud, has an XXE vulnerability that can be chained with an SSRF bug to gain remote command execution as root. It can be triggered by anyone who knows the IP address of the affected device.

Severity breakdown

CVSS v3.0 9.8: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-611: Improper Restriction of XML External Entity Reference

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Affected products

Axentra Hipserv: all versions listed by NVD