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SEED Labs – Format String Vulnerability Lab 1
Format String Vulnerability Lab
Copyright
c 2006 - 2014 Wenliang Du, Syracuse University.
The development of this document is/was funded by three grants from the US National Science Foundation:
Awards No. 0231122 and 0618680 from TUES/CCLI and Award No. 1017771 from Trustworthy Computing.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free
Documentation License, Version 1.2 or any later version published by the Free Software Foundation. A copy
of the license can be found at http://www.gnu.org/licenses/fdl.html.
1 Lab Overview
The learning objective of this lab is for students to gain the first-hand experience on format-string vulnerability
by putting what they have learned about the vulnerability from class into actions. The format-string vulnerability
is caused by code like printf(user input), where the contents of variable of user input
is provided by users. When this program is running with privileges (e.g., Set-UID program), this printf
statement becomes dangerous, because it can lead to one of the following consequences: (1) crash the
program, (2) read from an arbitrary memory place, and (3) modify the values of in an arbitrary memory
place. The last consequence is very dangerous because it can allow users to modify internal variables of a
privileged program, and thus change the behavior of the program.
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