June 28, 2017 Karn Ganeshen

[ICS] Cambium ePMP ICS-CERT Advisory Published

Back in April 2017, I posted about new vulnerabilities in Cambium ePMP devices.

ICS-CERT has now published the advisory for Cambium ePMP SNMP vulnerabilities:
https://ics-cert.us-cert.gov/advisories/ICSA-17-166-01

Vendor: Cambium Networks
Equipment: ePMP
Vulnerabilities: Improper Access Control, Improper Privilege Management

AFFECTED PRODUCTS

Cambium reports that the vulnerabilities affect the following ePMP Network Access Control products:

  • ePMP All Models.
IMPACT

Successful exploitation of these vulnerabilities may allow an attacker to access device configuration as well as make unauthorized changes to the product’s configuration.

MITIGATION

Cambium recommends that users with the affected products should update to firmware version 3.4-RC7 or newer. This update can be found by logging in at the following location:

https://support.cambiumnetworks.com/login(link is external)

Cambium also recommends that users edit default SNMP configuration. Affected models come set with the default values of “public” and “private” for RO (read only) and RW (read write) community strings. Cambium recommends changing this to a random string consisting of eight or more characters in length, including both upper and lower case letters and numbers for variability.

VULNERABILITY OVERVIEW

After a valid user has used SNMP configuration export, an attacker is able to remotely trigger device configuration backups using specific MIBs. These backups lack proper access control and may allow access to sensitive information and possibly allow for configuration changes.

CVE-2017-7918 has been assigned to this vulnerability. A CVSS v3 base score of 6.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L).

The privileges for SNMP community strings are not properly restricted, which may allow an attacker to gain access to sensitive information and possibly allow for configuration changes.

CVE-2017-7922 has been assigned to this vulnerability. A CVSS v3 base score of 7.6 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L).

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The original report can be read here:

[ICS] Cambium SNMP Security Vulnerabilities

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Cambium ePMP product security, putting it mildly, needs considerable improvement. I will be publishing another set of fresh reports on Cambium devices soon. In case you are using ePMP boxes, or other Cambium appliances, please ensure:

  1. your devices are not accessible publicly
  2. default account passwords & SNMP community strings are changed to strong values
  3. SNMP is filtered at the firewall.

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Cheers~

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