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Environment variables
  • x3n0n
    Posts: 110
    Everyone knows environment variables (PATH, USER, LOGNAME, etc...)
    Well you can overwrite these variables (export <VAR>="<new content>") and that can be quite handy with buffer overflows.
    But what I find hard is after I run a program (say I did a buffer overflow) and I want to find the environment variable USER and it's content in the stack.

    I had some piece of code that supposed to get me the address (in hex):
    char *address = (char *)getenv(\"USER\");
    printf(\"Address&#58; %x\n\", &address);


    but when I look at the returned address, its all 'random' shit I don't need.

    So does anybody know how I can find the address of the env variable?

    Thx up front ;)
  • x3n0n
    Posts: 110
    nvm, figured it out ;)
  • Sh3llc0d3
    Posts: 1,910
    Guessing this was for STS :p
  • CrashOverron
    Posts: 13
    if you figured it out why dont you post the answer in case someone else has a similar problem?
  • Null Set
    Posts: 112
    Seems like it's from STS actually. :P
  • x3n0n
    Posts: 110
    Yeah, it's STS :p But I was passing on the environment variables the wrong way. Once you pass them on correctly (with execve()) they are quite easy to find ;)
  • Null Set
    Posts: 112
    said:


    if you figured it out why dont you post the answer in case someone else has a similar problem?



    People would be able to just look at this for the answer and no longer think for themselves. :P
  • x3n0n
    Posts: 110
    said:


    said:


    if you figured it out why dont you post the answer in case someone else has a similar problem?



    People would be able to just look at this for the answer and no longer think for themselves. :P


    I <3 my brainZzz :p
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