Secure Telecom Platforms and Subscriber Systems

Telecommunications: Critical Infrastructure Under Constant Attack

Telecommunications companies operate critical national infrastructure. They manage the networks that every other industry depends on, hold subscriber data for millions of customers, and operate complex web-based management systems that control everything from customer accounts to network configuration. The web application attack surface of a major telecom operator is massive and growing.

The consequences of telecom vulnerabilities extend beyond the carrier itself. SIM swap fraud compromises not just the telecom account but every service that relies on SMS-based authentication, including banking, email, and cryptocurrency exchanges. A breach of call detail records exposes communication patterns with intelligence value. Unauthorized service provisioning can enable fraud at scale.

SIM Swap Fraud: The Telecom-Specific Threat

SIM swap fraud is one of the most damaging attacks that originates from telecom platform vulnerabilities. An attacker convinces the carrier (either through social engineering of support staff or exploitation of self-service portal vulnerabilities) to transfer the victim's phone number to an attacker-controlled SIM. The attacker then receives all SMS messages and calls, bypassing MFA on banking, email, and other critical accounts.

APVISO tests the web application layer that enables SIM swap attacks:

• Self-service portal authentication: Are SIM swap and number management functions protected by strong re-authentication?
• Identity verification bypass: Can identity verification steps in the SIM change flow be skipped or manipulated?
• Account recovery abuse: Can account recovery mechanisms be exploited to gain access and initiate SIM changes?
• Rate limiting: Are sensitive operations like SIM swap requests rate-limited to prevent automated attacks?
• Support portal authorization: Are customer support web tools properly authenticated and audited for SIM change operations?

Subscriber Management APIs

Telecom subscriber management systems expose APIs for account management, service provisioning, billing, and usage monitoring. These APIs serve multiple frontend applications: consumer self-service portals, business customer dashboards, mobile apps, retail store systems, and partner portals.

The authorization model across these APIs is complex. A consumer customer should manage their own account. A business customer administrator should manage their organization's accounts. A retail store agent should provision new accounts but not access existing customer data beyond the current transaction. A wholesale partner should manage their reseller customers but not see the parent carrier's direct customers.

APVISO's scanner agent tests each API endpoint against every role boundary:

• Consumer accessing other consumers' call records through IDOR
• Business customer accessing consumer subscriber data
• Retail agent accessing historical customer information beyond the current transaction
• Wholesale partner accessing another partner's subscriber base

Service Provisioning Integrity

Ordering and provisioning systems translate customer requests into active services. These systems handle plan selection, feature activation, number assignment, and service configuration. Business logic flaws in provisioning workflows can enable:

• Unauthorized plan changes: Downgrading to a cheaper plan while retaining premium features
• Feature activation: Enabling services (international calling, data add-ons, premium channels) without payment
• Number assignment manipulation: Obtaining specific phone numbers or accessing number ranges reserved for other purposes
• Billing avoidance: Exploiting timing or logic flaws to activate services without corresponding billing records

APVISO tests provisioning APIs for these business logic vulnerabilities, ensuring that what a customer orders is what they receive and what they are billed for.

Network Management Interface Exposure

Telecom operators manage network infrastructure through web-based management systems: network element managers, NOC dashboards, configuration management tools, and monitoring platforms. These interfaces should be strictly internal, but misconfiguration, VPN vulnerabilities, or SSRF from customer-facing applications can make them reachable from the internet.

APVISO's recon agent identifies exposed management interfaces through comprehensive discovery. The scanner agent tests any accessible management interfaces for authentication, default credentials, and authorization flaws. Critically, APVISO also tests customer-facing applications for SSRF vulnerabilities that could pivot to internal network management systems.

Call Detail Records and Privacy

Call detail records (CDRs) contain metadata about every call and message: originating number, destination number, timestamp, duration, and cell tower location. This data is extraordinarily sensitive from both a privacy and intelligence perspective. Telecom web applications that provide usage details, billing breakdowns, or analytics must ensure that CDR data is accessible only to the account holder.

APVISO tests all endpoints that expose call, message, or data usage records for IDOR, authorization bypass, and excessive data exposure. The scanner agent verifies that usage data APIs properly scope results to the authenticated subscriber's account.

Securing the Infrastructure Everyone Depends On

Telecommunications is foundational infrastructure. Every industry, every government agency, and every individual depends on telecom networks and the security of their accounts with telecom providers. APVISO helps telecom operators identify and fix the web application vulnerabilities that threaten subscriber security, operational integrity, and national infrastructure resilience.