( ~~~ )
  ))^ ^((
 ((* - *))
   _) (_
 / '--' \     ^
//(_  _)\\   /_\
\\ )__( //   .'
 (( v  ))   (
   \| /\     '-.
    K(  \       )
    |\\  '-._.-'
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Wednesday, June 29, 2011

Null Byte Injection in preg_replace()

When reviewing some PHP code, I came across a real world example of a strange and undocumented (but it's been breifly mentiond in MOPS Submission 07) feature/bug in the function preg_replace. On certain systems, preg_replace seems to be vulnerable to a null byte injection. If both the first and second argument is derived from user input this could lead to a remote code execution.

Tuesday, June 21, 2011

Speeding up Blind SQL Injections using Conditional Errors in MySQL

Please note that this article expects some prior knowledge of blind SQL injections.

Edit: If you want to read about this in Russisn, its been published here in 2009.
Edit2: jrm` provided me with a working implementation of this method which he coded using information from this article. His code can be read at the bottom of this article or downloaded here.
Edit3: jrm` also created python script which can be downloaded here.

Usually a syntax error in a blind SQL injection will have some sort of visible effect in the output of a web application. So what if we could conditionally generate such an error instead of relying on conditionally delaying and timing a request using functions such as BENCHMARK or SLEEP?

Monday, June 20, 2011

Comming Soon

I'll be launching this blog with it's first post in a couple of days. Stay tuned.