CVE-2017-6094

Critical

Published: 20/12/2017(UTC)Translated: 14/06/2026(UTC)NVD NIST

Summary

CVE-2017-6094 vulnerability allows forging 'chk' values for MAC addresses, enabling access to configuration settings of other subscribers. These settings may contain sensitive information such as credentials for VoIP services.

Risk Assessment

Organizations may be exposed to unauthorized access to sensitive information, potentially leading to security breaches and data loss.

Recommendation

It is recommended to update GAPS software to a version above 7.2 and implement additional security mechanisms to prevent 'chk' value forgery.

Original NVD description (English source)

CPEs used by subscribers on the access network receive their individual configuration settings from a central GAPS instance. A CPE identifies itself by the MAC address of its WAN interface and a certain "chk" value (48bit) derived from the MAC. The algorithm used to compute the "chk" was disclosed by reverse engineering the CPE's firmware. As a result, it is possible to forge valid "chk" values for any given MAC address and therefore receive the configuration settings of other subscribers' CPEs. The configuration settings often contain sensitive values, for example credentials (username/password) for VoIP services. This issue affects Genexis B.V. GAPS up to 7.2.