title: MAS (a Carrier brand) MASmobile Classic Authorization Bypass
description: Authorization bypass can be achieved by session ID prediction in MASmobile Classic Android  version 1.16.18 and earlier and
MASmobile Classic iOS version 1.7.24 and earlier
which allows remote attackers to retrieve sensitive data  including customer data, security system status, and event history.
problem types: CWE-639 Authorization Bypass Through User-Controlled Key
affected:
{
defaultStatus: unaffected
platforms: Android
product: MASmobile Classic
vendor: MAS (a Carrier brand)
versions:
lessThanOrEqual: 1.16.18, status: affected, version: 1, versionType: custom
}
{
defaultStatus: unaffected
platforms: iOS
product: MASmobile Classic
vendor: MAS (a Carrier brand)
versions:
lessThanOrEqual: 1.7.24, status: affected, version: 1, versionType: custom
}
{
defaultStatus: unaffected
product: MAS ASP.Net Services
vendor: MAS (a Carrier brand)
versions:
lessThanOrEqual: 1.9, status: affected, version: 1, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
version: 3.1
]
format: CVSS
scenarios: GENERAL
solutions: 1. Uninstall MASmobile Classic Services - These services are installed and configured manually in IIS within a virtual directory.  To uninstall, unpublish the services in IIS and remove the service files.  All versions (v1.7, 1.8, and 1.9) were discontinued.
2. Remove the MASmobile Classic app from Android and iOS devices.  All versions (v1.x.x) were discontinued and no longer available in the app stores (Play and AppStore).
3. Contact MAS to arrange the installation of MASterMind EX Services (v6.46 or later).  These services do not run under IIS and must be configured in coordination with the customer.
4. Install MASmobile app from Play or AppStore (v2.x.x).  This is not an upgrade to MASmobile Classic; it is a different app.