Content in vulnerability string attack
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I am learning about format string attack and am struggling to understand how the string before the format string overwrites the content of an address.
I am reading from a great article: http://www.cis.syr.edu/~wedu/Teaching/cis643/LectureNotes_New/Format_String.pdf
I understand that if the user have control over the variable to be printed in printf such as
printf (Uservariable);
the user can opt to not pass in variables after format strings and change the content of the address using strings such as
printf ("x10x01x48x08 %x %x %x %x %s");
However from the diagram below, 0x10014808 is concat into an address when it should be in the white spaces shown below.
How does %x pushes all the numbers together to form the address to overwrite %s?
c security printf exploit
asked Nov 11 at 16:48
Bloopie Bloops
46021135
add a comment |
up vote
0
down vote
favorite
I am learning about format string attack and am struggling to understand how the string before the format string overwrites the content of an address.
I am reading from a great article: http://www.cis.syr.edu/~wedu/Teaching/cis643/LectureNotes_New/Format_String.pdf
I understand that if the user have control over the variable to be printed in printf such as
printf (Uservariable);
the user can opt to not pass in variables after format strings and change the content of the address using strings such as
printf ("x10x01x48x08 %x %x %x %x %s");
However from the diagram below, 0x10014808 is concat into an address when it should be in the white spaces shown below.
How does %x pushes all the numbers together to form the address to overwrite %s?
c security printf exploit
asked Nov 11 at 16:48
Bloopie Bloops
46021135
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am learning about format string attack and am struggling to understand how the string before the format string overwrites the content of an address.
I am reading from a great article: http://www.cis.syr.edu/~wedu/Teaching/cis643/LectureNotes_New/Format_String.pdf
I understand that if the user have control over the variable to be printed in printf such as
printf (Uservariable);
the user can opt to not pass in variables after format strings and change the content of the address using strings such as
printf ("x10x01x48x08 %x %x %x %x %s");
However from the diagram below, 0x10014808 is concat into an address when it should be in the white spaces shown below.
How does %x pushes all the numbers together to form the address to overwrite %s?
c security printf exploit
asked Nov 11 at 16:48
Bloopie Bloops
46021135
I am learning about format string attack and am struggling to understand how the string before the format string overwrites the content of an address.
I am reading from a great article: http://www.cis.syr.edu/~wedu/Teaching/cis643/LectureNotes_New/Format_String.pdf
I understand that if the user have control over the variable to be printed in printf such as
printf (Uservariable);
the user can opt to not pass in variables after format strings and change the content of the address using strings such as
printf ("x10x01x48x08 %x %x %x %x %s");
However from the diagram below, 0x10014808 is concat into an address when it should be in the white spaces shown below.
How does %x pushes all the numbers together to form the address to overwrite %s?
c security printf exploit
c security printf exploit
asked Nov 11 at 16:48
Bloopie Bloops
46021135
asked Nov 11 at 16:48
Bloopie Bloops
46021135
asked Nov 11 at 16:48
Bloopie Bloops
46021135
asked Nov 11 at 16:48
Bloopie Bloops
46021135
asked Nov 11 at 16:48
Bloopie Bloops
46021135
46021135
add a comment |
add a comment |
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