v0ids3curity.blogspot.com

v0id s3curity

Yet another blog by a security enthusiast! Monday, July 13, 2015. PoliCTF RE350 - JOHN THE PACKER - PIN Z3. The 32bit ELF is a self modyfing code. So I decided to use PIN for futher analysis. Pin -t obj-ia32/exectrace.so - ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} 0x80488f8 : cmp eax, 0x21 0x80488f8 : [0x21] [0x21]. Ltrace -i ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} [0x80488f5] strlen("flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0".) = 33. Length of flag is 33 bytes. Key[20] 0x10 = key[21] key[21] 0x44 = key[22] ...

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Yet another blog by a security enthusiast! Monday, July 13, 2015. PoliCTF RE350 - JOHN THE PACKER - PIN Z3. The 32bit ELF is a self modyfing code. So I decided to use PIN for futher analysis. Pin -t obj-ia32/exectrace.so - ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} 0x80488f8 : cmp eax, 0x21 0x80488f8 : [0x21] [0x21]. Ltrace -i ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} [0x80488f5] strlen(flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0.) = 33. Length of flag is 33 bytes. Key[20] 0x10 = key[21] key[21] 0x44 = key[22] &#4...

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v0id s3curity | v0ids3curity.blogspot.com Reviews

https://v0ids3curity.blogspot.com

Yet another blog by a security enthusiast! Monday, July 13, 2015. PoliCTF RE350 - JOHN THE PACKER - PIN Z3. The 32bit ELF is a self modyfing code. So I decided to use PIN for futher analysis. Pin -t obj-ia32/exectrace.so - ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} 0x80488f8 : cmp eax, 0x21 0x80488f8 : [0x21] [0x21]. Ltrace -i ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} [0x80488f5] strlen("flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0".) = 33. Length of flag is 33 bytes. Key[20] 0x10 = key[21] key[21] 0x44 = key[22] &#4...

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v0ids3curity.blogspot.com

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v0id s3curity: July 2015

http://www.v0ids3curity.blogspot.com/2015_07_01_archive.html

Yet another blog by a security enthusiast! Monday, July 13, 2015. PoliCTF RE350 - JOHN THE PACKER - PIN Z3. The 32bit ELF is a self modyfing code. So I decided to use PIN for futher analysis. Pin -t obj-ia32/exectrace.so - ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} 0x80488f8 : cmp eax, 0x21 0x80488f8 : [0x21] [0x21]. Ltrace -i ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} [0x80488f5] strlen("flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0".) = 33. Length of flag is 33 bytes. Key[20] 0x10 = key[21] key[21] 0x44 = key[22] &#4...

2

v0id s3curity: September 2014

http://www.v0ids3curity.blogspot.com/2014_09_01_archive.html

Yet another blog by a security enthusiast! Thursday, September 25, 2014. CSAW CTF Quals 2014 - S3 - Exploitation 300 - [Team SegFault]. For this challenge we got a Linux 64-bit ELF executable [C code]. ASLR was enabled in the remote machine and NX disabled in executable. The executable is simply, it could store counted and NUL terminated string. Stored strings could also be updated and read using id. Below is the data structure for storing Counted String:. And for NUL-Terminated String:. During read oper...

3

v0id s3curity: Fun with SROP Exploitation

http://www.v0ids3curity.blogspot.com/2015/06/fun-with-srop-exploitation.html

Yet another blog by a security enthusiast! Saturday, June 20, 2015. Fun with SROP Exploitation. This post is regarding another solution for the same problem mentioned in Return to VDSO using ELF Auxiliary Vectors. So the idea here is to exploit a tiny binary remotely using SigReturn Oriented Programming (SROP) without info leak or bruteforce. Below is the challenge code:. Make text segment RWX using mprotect. The idea is to change the permission of text segment by calling mprotect(0x08048000, 0x1000, 7)&...

4

v0id s3curity: July 2014

http://www.v0ids3curity.blogspot.com/2014_07_01_archive.html

Yet another blog by a security enthusiast! Monday, July 7, 2014. Pwnium CTF 2014 - Be a Robot - PWN 200 - [Team SegFault]. A 32-bit ELF was given for this challenge. The binary is simple which reads name and age. Root@renorobert Pwnium]# ./pwn200 Name: A Age: 20 Bye dude ;). The vulnerability was in atExit function. This is what it looked like:. When the age is set to 0 or less, the function pointer is uninitialized. Root@renorobert Pwnium]# ./pwn200 Name: A Age: 0 Segmentation fault (core dumped). Root@...

5

v0id s3curity: October 2014

http://www.v0ids3curity.blogspot.com/2014_10_01_archive.html

Yet another blog by a security enthusiast! Friday, October 24, 2014. ECTF 2014 - SEDDIT - Exploit 400. Using this uninitialized contents of ContentBuffer could be leaked. But NUL bytes in stack would prevent us from leaking much of the useful info easily. I spent lot of time working along this path. Lets see what the program actually does:. Login option - Supply the username and DES generated password. Also there is separate login for admin which will give us the flag. MakePost - We saw this earlier.

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v0ids3curity.blogspot.com

v0id s3curity

Yet another blog by a security enthusiast! Monday, July 13, 2015. PoliCTF RE350 - JOHN THE PACKER - PIN Z3. The 32bit ELF is a self modyfing code. So I decided to use PIN for futher analysis. Pin -t obj-ia32/exectrace.so - ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} 0x80488f8 : cmp eax, 0x21 0x80488f8 : [0x21] [0x21]. Ltrace -i ./re350 flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0} [0x80488f5] strlen("flag{ABCDEFGHIJKLMNOPQRTSUVWXYZ0".) = 33. Length of flag is 33 bytes. Key[20] 0x10 = key[21] key[21] 0x44 = key[22] &#4...

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