Archive for July, 2017

Trace Analysis Patterns (Part 151)

Thursday, July 20th, 2017

Certain types of blind SQL injection attacks may leave log messages with just one byte difference. We call with analysis pattern Ultrasimilar Messages by analogy with an ultrametric space in mathematics and the interpretation of messages as p-adic numbers. Since, such messages may be scattered in a log we can choose Message Pattern based on some Message Invariant (for example, parts of SQL request) and then analyze its Fiber of Activity (for example, Data Flow of its variable part). A log with two different types of Ultrasimilar Messages is shown in the following diagram:

- Dmitry Vostokov @ + -