Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hcltech | Legacy Ivr Firmware | - |
| Hcltech | Legacy Ivr | - |
Related Weaknesses (CWE)
References
- http://virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.htmlThird Party Advisory
- https://datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.htmlThird Party Advisory
- https://twitter.com/mishradhiraj_/status/1001664204485652482Third Party Advisory
- https://twitter.com/mishradhiraj_/status/1001664440759091207Third Party Advisory
- http://virgil-cj.blogspot.com/2018/05/0day-legacy-ivr-lets-phreak.htmlThird Party Advisory
- https://datarift.blogspot.com/2018/05/CVE-2018-11518-abusing-ivr-systems.htmlThird Party Advisory
- https://twitter.com/mishradhiraj_/status/1001664204485652482Third Party Advisory
- https://twitter.com/mishradhiraj_/status/1001664440759091207Third Party Advisory
FAQ
What is CVE-2018-11518?
CVE-2018-11518 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 f...
How severe is CVE-2018-11518?
CVE-2018-11518 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-11518?
Check the references section above for vendor advisories and patch information. Affected products include: Hcltech Legacy Ivr Firmware, Hcltech Legacy Ivr.