CVE-2018-11518 Information

Description

A vulnerability allows a phreaking attack on HCL legacy IVR systems that do not use VoIP. These IVR systems rely on various frequencies of audio signals; based on the frequency certain commands and functions are processed. Since these frequencies are accepted within a phone call an attacker can record these frequencies and use them for service activations. This is a request-forgery issue when the required series of DTMF signals for a service activation is predictable (e.g. the IVR system does not speak a nonce to the caller). In this case the IVR system accepts an activation request from a less-secure channel (any loudspeaker in the caller’s physical environment) without verifying that the request was intended (it matches a nonce sent over a more-secure channel to the caller’s earpiece).

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

http://virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.html https://datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.html https://twitter.com/mishradhiraj_/status/1001664204485652482 https://twitter.com/mishradhiraj_/status/1001664440759091207

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1