CVE Vulnerabilities

CVE-2021-23162

Improper Following of a Certificate's Chain of Trust

Published: Nov 18, 2021 | Modified: Nov 21, 2024
CVSS 3.x
8.1
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
6.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu

Improper validation of the cloud certificate chain in Mobile Connect allows man-in-the-middle attack to impersonate the legitimate Command Centre Server. This issue affects: Gallagher Command Centre Mobile Connect for Android 15 versions prior to 15.04.040; version 14 and prior versions.

Weakness

The product does not follow, or incorrectly follows, the chain of trust for a certificate back to a trusted root certificate, resulting in incorrect trust of any resource that is associated with that certificate.

Affected Software

Name Vendor Start Version End Version
Command_centre_mobile_connect Gallagher * 14.0 (including)
Command_centre_mobile_connect Gallagher 15.0 (including) 15.04.040 (excluding)

Extended Description

If a system does not follow the chain of trust of a certificate to a root server, the certificate loses all usefulness as a metric of trust. Essentially, the trust gained from a certificate is derived from a chain of trust – with a reputable trusted entity at the end of that list. The end user must trust that reputable source, and this reputable source must vouch for the resource in question through the medium of the certificate. In some cases, this trust traverses several entities who vouch for one another. The entity trusted by the end user is at one end of this trust chain, while the certificate-wielding resource is at the other end of the chain. If the user receives a certificate at the end of one of these trust chains and then proceeds to check only that the first link in the chain, no real trust has been derived, since the entire chain must be traversed back to a trusted source to verify the certificate. There are several ways in which the chain of trust might be broken, including but not limited to:

Potential Mitigations

References