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Articles

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Application Security

ASVS 5.0 V2.4.1: Add Anti-Automation Controls to Costly Functions

ASVS 5.0 V2.4.1 (Level 2) requires controls against excessive calls to app functions. Rate limit patterns, quotas, and load tests to prove they work.

Oct 18, 20265 min read
Application Security

ASVS 5.0 V2.3.5: Require Multi-User Approval for High Value Actions

ASVS 5.0 V2.3.5 (Level 3) requires a second approver for high value flows such as large transfers. Design notes for four eyes approval and how to test it.

Oct 18, 20262 min read
Application Security

ASVS 5.0 V2.3.4: Lock Limited Resources to Stop Double Booking

ASVS 5.0 V2.3.4 (Level 2) requires locking so seats and slots cannot be double booked. SQL locking and constraint patterns, with a concurrent test.

Oct 18, 20264 min read
Application Security

ASVS 5.0 V2.3.3: Use Transactions So Operations Fully Succeed or Roll Back

ASVS 5.0 V2.3.3 (Level 2) requires business operations to complete entirely or roll back. Transaction code, failure injection tests and common pitfalls.

Oct 18, 20263 min read
Application Security

ASVS 5.0 V2.3.2: Implement the Documented Business Limits

ASVS 5.0 V2.3.2 (Level 2) requires business limits to be enforced as documented. How to code per user and global limits, and how to test them.

Oct 18, 20263 min read
Application Security

ASVS 5.0 V2.3.1: Enforce Business Flow Step Order

ASVS 5.0 V2.3.1 (Level 1) requires flows to run in order with no skipped steps. Server side state machine code, plus tests that jump straight to the last step.

Oct 18, 20264 min read
Application Security

ASVS 5.0 V2.2.3: Check That Related Data Items Make Sense

ASVS 5.0 V2.2.3 (Level 2) requires combinations of related fields to be reasonable under predefined rules. A short code pattern and how to test it.

Oct 18, 20262 min read
Application Security

ASVS 5.0 V2.2.2: Enforce Input Validation Server Side

ASVS 5.0 V2.2.2 (Level 1) requires validation at a trusted service layer, with client checks only for usability. Layered design and a simple bypass test.

Oct 18, 20264 min read
Application Security

ASVS 5.0 V2.2.1: Validate Input Against Allow Lists

ASVS 5.0 V2.2.1 (Level 1) requires positive validation of input against allowed values, patterns and ranges. Code in Python and TypeScript, plus tests.

Oct 18, 20263 min read

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