What is CVE-2017-6094?

CVE-2017-6094 is a critical-severity vulnerability in Genexis Gaps, classified under Information Disclosure. CVSS score: 9.8/10. Published 2017-12-20.

How severe is CVE-2017-6094?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Information disclosure in Genexis Gaps

CVE-2017-6094

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.

Vulnerability class: Information Disclosure

EPSS: 0.012 (64.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Genexis Gaps
N/a — versions n/a

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

cve@mitre.org (mailing-list, Exploit, x_refsource_FULLDISC, Mailing List, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2017-6094?: CVE-2017-6094 is a critical-severity vulnerability in Genexis Gaps, classified under Information Disclosure. CVSS score: 9.8/10. Published 2017-12-20.
How severe is CVE-2017-6094?: Critical severity. CVSS v3 base score is 9.8 out of 10.