Collected research

Blind SQL Injection: Inference thourgh Underflow exception

Blind SQL Injection: Inference through Underflow Error

A blind SQL injection with no true/false oracle is turned into one by arithmetic: dividing by INSTR(SUBSTR(...)) raises a divide-by-zero exception whenever a guessed character is wrong, and the application's error handler returns a distinguishable second message. Character-by-character inference then reads the Oracle version out of v$instance.

Record

Document

Blind SQL Injection: Inference through Underflow Error

Published by

dbellucci.blogspot.com

Topic

Injection

In the archive

• Collected in the 2009 research round

Tags

• sqli
• database
• injection
• side-channel
• owasp-a03-2021

This page is the archive's own catalogue record. The research is the work of dbellucci.blogspot.com, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 10 August 2026.