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CVE-2018-11518

8.1 · HIGH

A vulnerability allows a phreaking attack on HCL legacy IVR systems that do not use VoIP.

Published May 30, 2018CWE-20EPSS 1.40%

Overview

CVE-2018-11518 is a high-severity vulnerability. It was published on May 30, 2018 and has a CVSS 3.0 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.0 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refvirgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.htmlRefdatarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.htmlReftwitter.com/mishradhiraj_/status/1001664204485652482Reftwitter.com/mishradhiraj_/status/1001664440759091207Refvirgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.htmlRefdatarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.htmlReftwitter.com/mishradhiraj_/status/1001664204485652482Reftwitter.com/mishradhiraj_/status/1001664440759091207

How CyberStrike helps

Frequently asked questions

What is CVE-2018-11518?

CVE-2018-11518 is a high-severity vulnerability. It was published on May 30, 2018 and has a CVSS 3.0 base score of 8.1 (HIGH).

How severe is CVE-2018-11518?

This vulnerability has a CVSS 3.0 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-11518?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-11518?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-11518 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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