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SQL injection/Blind/Extraction/Timing
From NetSec
Revision as of 19:23, 19 November 2012 by JtRIPper (Talk | contribs) (Created page with "{{warning|<i>If not on a '''LAN''' when this technique is utilized, buggy and unpredictable results '''will''' be attained.</i>}} This testing is ideal when''': * It is taking pl...")
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If not on a LAN when this technique is utilized, buggy and unpredictable results will be attained. |
This testing is ideal when:
- It is taking place on a relatively low latency network
- There is access to a consistent latency and the remote page has a consistent load time (may not vary by more than 0.5 seconds)
Single byte exfiltration takes less queries to perform the same results, and leaves a smaller log footprint.
- A timer will need to be used to see how long it takes the remote server to serve the page.
Examples of timing-based single-byte exfiltration:
- Exfiltrating the first character of the database name in a single request:
AND sleep(ascii(SUBSTRING(@@DATABASE,1,1))) -- MySQL AND pg_sleep(ascii(SUBSTRING(current_database,1,1))) IS NULL -- PostgreSQL |
- By timing these (in seconds) the integer value of the ascii code of the first character of the database will be attained.
