Questions tagged [exploit-development]

For questions about development of software which takes advantage of exploits (vulnerabilities in security systems).

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Exploiting a service on 32bit OS on a 64bit processor with ShellCode

Let's theoretically assume I have an overflow vulnerability on a certain service I want to exploit. The service reside in 32bit Operating System on a 64bit Processor. I'm attempting to wrap my head ...
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Exploit education stack-five: trouble opening shell

Im trying the phoenix vm, challenge stack-five on exploit.education (http://exploit.education/phoenix/stack-five/). I run onto a problem while exploiting a stack overflow. The challenge is run execve('...
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70 views

Secure code makes exploitation easier with CPU vulnerabilities?

I researched CPU vulnerabilities in the past, such as Specter and Meltdown. I read that one of those attacks is made easier if the code is a certain way. I cannot remember if it was related to being ...
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37 views

how to check offset for a program on remote server

I am solving pwn problems in CTF challenges. my exploits are working in the local system but it doesn't work on the remote server when connecting using Netcat. The issue was that even the function ...
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1answer
94 views

segmentation fault at strcpy while perforforming a buffer overflow

I have this code that I need to use to perform a ret2libc #include <stdio.h> #include <string.h> int main(int argc, char *argv[]) { char buf[256]; printf("buff is at:%p\n",buf); ...
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1answer
53 views

is there any way to exit meterpreter without exit the process?

I have a target process I'm injecting meterpreter shellcode (windows/meterpreter/reverse_tcp) into, I manage to get a shell but when I exit it, the process exits as well. Is there any easy way to make ...
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1answer
92 views

Does flooding with bytes cause buffer overflow? [closed]

If I flood a C program with bytes can I cause buffer overflow, or is there other stuff I have to take into account?
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4answers
204 views

What are the names of software vulnerabilities? [closed]

In web apps there are vulnerabilities like SQLi or XSS and many more. I heard that for hackers to hack a computer they have to find a vulnerability in a software that is running on an open port. ...
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30 views

Unable to exploit SQL injection in the parameter

During my testing I have found a vulnerable parameter in an API (/api/v1/documents/?direction=desc&limit=30&mode=reports**&page=1**) and its parameter is page=1 at the end. Upon giving the ...
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1answer
75 views

How to use “jmp” in ROP

I'm trying to put together a ROP chain. I'm looking for a gadget to do the following: mov rdi, rdx ; mov rbp, rsp ; ret; But instead, I have a gadget like this : mov rdi, rdx ; mov rbp, rsp ; ...
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1answer
88 views

How many actions do you need to take to disable DEP

I am attempting to disable DEP on a program that will be used in a demonstration of how a basic buffer overflow works. The application is a C++ app written in visual studio and I am running into ...
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1answer
116 views

How do programmers write the initial exploits from the vulnerability details in a CVE? [closed]

I've noticed that lots of CVE at www.cvedetails.com do not have publicly available exploits. But they have high scores (ex: score higher than 9). With such a high score, I'd thought exploits would be ...
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2answers
148 views

Cannot build a ROP chain

My ROP exploit crashes with segmentation fault for unknown reason. This is a vulnerable code (compiled via command gcc h2.c -no-pie -fno-stack-protector -m32 -o h2): #include <stdio.h> #include &...
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53 views

Kernel exploit fails after executing first command

While trying to solve old ctf task (https://blog.frizn.fr/plaidctf-2013/pwn-400-servr) I've encountered a situation which I don't understand. TLTR After escalating process privileges my exploit ...
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1answer
127 views

64bit buffer overflow fails with SIGILL, cannot understand the reason

I have been doing 32bit buffer overflows for some time and I decided to try some 64bit overflows, to explore some more realistic scenarios. I have compiled my code with gcc -fno-stack-protector -z ...
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101 views

heap-one (x64) CTF exploit exercise: cannot overwrite GOT entry using arbitrary write (qword) primitive?

I'm currently working on the following CTF exercise (x64 version), where the objective is to overwrite a pointer stored on the heap to control the write address of strcpy(): https://exploit.education/...
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Why isn't the checksum length increased on macOS to mitigate generic heap exploitation?

I've been studying heap exploitation on Linux/macOS for learning purposes. Many of the generic exploits on macOS rely on brute-forcing the 4-bit checksum derived from the rack's cookie value. This ...
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1answer
60 views

Leak multiple lines from file

I am researching this bug here, where the first line of an arbitrary file can be leaked by triggering a SyntaxError using the compile() function. Is there a method of leaking the rest of the file, ...
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83 views

Why can't you jump from SEH straight to payload for SEH buffer overflow?

From my understanding a typical way to achieve SEP buffer overflow (ignoring protections like DEP, SafeSEH, etc.) is to overwrite SEH with POP POP RET which goes back to nSEH which we control. nSEH ...
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1answer
292 views

buffer overflow in MIPS - jump to address 0x0040xxxx

I'm trying to exploit a buffer overflow vulnerability in MIPS architecture. ASLR is enable, but the binary compiled without PIE (hence loaded always to 0x00400000). However, the vulnerable code uses ...
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1answer
108 views

How to get gain the knowledge to be a beginner penetration tester on my own? [closed]

I want to apply for a job as a penetration tester in a good company. I have a fairly good knowledge of programming and have experience as a back-end developer. I started to work with Burpsuite, ZAP, ...
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1answer
217 views

Remote Buffer Overflow w/out Memory Leak

I'm working on an exploit development challenge right now in which I've been presented with a compiled binary and I have to exploit it on a remote server. No stack protections have been enabled and ...
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1answer
259 views

Is it necessary to understand Linux kernel internals to do binary exploitation? [closed]

I am second-year CS student, I know C, OOP concepts, x86 architecture, reverse engineering basics, TCP/IP stack and OS concepts, also I love Linux OS. I have just one question: Is it a mandatory to ...
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1answer
497 views

What is the purpose of using hex escape sequences when writing buffer overflow exploits?

I was trying to overwrite fp function pointer to 0x8048424(win() location) so that function win() will be called to solve this problem(machine is little endian) #include <stdlib.h> #include <...
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1answer
108 views

How to exploit buffer overflow without space after return address?

I'm working on a binary exploitation challenge where the target (ELF/x86_64) has stack canaries, NX and PIE enabled. It implements a simple forking TCP server. After a connection is established, it ...
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1answer
267 views

What does this opcode in my exploit code mean?

I'm trying to develop an already existing exploit for Windows XP. All DLL's are protected by ASRL, so I used an address in ultraiso.exe, but all addresses start with NULL-bytes. So far, I followed ...
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1answer
377 views

linux kernel exploit shellcode causes segfault

I'm learning how to write kernel exploits and my shellcode keeps seg faulting. I'm getting the memory address for commit_creds(prepare_kernel_cred(0)); #grep commit_creds /proc/kallsyms c907eea0 T ...
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142 views

Sending payload and additional commands via Python

I'm trying to exploit ropasaurusrex binary. Basically It has buffer overflow vulnerability. Binary reads data from stdin and fills it to buffer. My goal for payload is to overwrite EIP with address ...
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93 views

Methods of exploiting a Windows executable protected by “Control Flow Guard” and “Return Flow Guard”?

I understand that obtaining code execution by stack buffer-overflows were mitigated by DEP, which in turn lead to SEH and ROP exploit techniques etc. However, I don't see how to exploit an executable ...
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1answer
112 views

When to perform secure code review?

OWASP recommends that secure code review to be performed throughout the SDLC process. Although it makes sense to perform secure code review before moving codes to production, could anyone here help ...
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1answer
950 views

Bypassing ASLR using information leaks

Most of my questions were answered in this post ASLR bypass with info leak However, I just want to know the process of getting the memory address from the information leak to then using it in the ...
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1answer
157 views

Exploit Development on windows environments

I have seen on many Poc exploits this line , but I wonder how people do this using immunity debugger,or do we need to reverse itself the windows? is there a way to do this using mona or some easy way ?...
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50 views

Can an attacker spoof content provider, backup manager or wallpaper manager in Android?

We need a backup of SMSes, apps, device settings, wallpapers and contacts of the device through our designed app. So, is it possible for an attacker to spoof, tamper, impersonate source data (SMSes, ...
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1answer
208 views

Why are there no free resources on exploit development on macOS? [closed]

There are many resources on Linux exploit development, but I cannot find any resources targeting macOS, except for some bad ones on YouTube. Why are there no write-ups on macOS exploitation ...
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1answer
2k views

Problem with overwriting the return address (buffer overflow)

I'm trying to exploit the following code with a buffer overflow and make it run the overflowed function: #include <string.h> #include <stdio.h> void overflowed() { printf("%s\...
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173 views

How to start with javascript engine exploitation [closed]

I am beginner in exploit development. My experience is developing buffer overflow exploits and shellcoding. Now I want to begin with javascript engine exploitation. 1.What are five papers, books, ...
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334 views

Android Exploit Development Lab [closed]

Looking to setup an exploit development environment to do the following: Fuzz Android libraries to find new vulnerabilities Re-create already existing bugs/vulnerabilities based on bug fixes found on ...
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1answer
188 views

Stack Buffer Overflow using SEH in Simple Web Server 2.2rc2

I am practicing writing exploit for Simple Web Server 2.2rc2. I was able to: find proper offset to overwrite SE Handler and Next SEH find POP,POP,RET address My problem is that, I can't execute my ...
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99 views

String Format Exploit x64 compiled with -Wformat-security -D_FORTIFY_SOURCE=2 on

I found a daemon running as uid 0 that has a string format vulnerability. It is compiled with -Wformat-security and -D_FORTIFY_SOURCE=2 on. I'm trying to write an exploit for it, but what I get is: ...
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1answer
561 views

Exploit Development - Find system address in a given libc

If I have a libc file which is used on another server where the vulnerable binary is running, then how can I find the address of system in it? I have both the vulnerable binary and the libc file with ...
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1answer
126 views

Found how to get Oauth2 client_id along matching secret but redirect_uri is whitelisted as requirement. Is it still safe?

If you get an OAuth 2.0 client_id along with a matching secret, you can in theory impersonate the target website. You trick the victim into visiting your URL; Through the client_id and the matching ...
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1answer
342 views

Shellcode getting segmentation fault on vmware

I'm learning exploitation, and I downloaded some execve("/bin/sh") shellcode from exploit-db to use it in simple buffer overflow example. When I execute the program I am getting segmentation fault. I'...
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1answer
279 views

Exploit “Blind” buffer overflow in a lab

In a CTF/exploitation lab, I am aware of two separate machines. Developer machine: Windows 7 x64, as blank, as it can get (no KB patch) Service machine: UNKNOWN On Developer: I have a source code ...
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1answer
802 views

How do exploit developers counter control-flow integrity (CFI) used to prevent ROP-based buffer overflow attacks?

How do exploit developers counter control-flow integrity (CFI) used to prevent ROP-based buffer overflow attacks? Originally, return-oriented programming (ROP) was invented to counter the no-execute (...
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157 views

EIP Overwrite Exploit not working

I am writing an exploit for an x86 binary on Linux and I'm learning exploitation. The binary has no protections and the stack is also executable. It has a buffer overflow when it uses memcpy() ...
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1answer
241 views

Does an Egghunter attack still make sense in a 64 bit system?

Background An Egghunter is basically a low size stub that acts as a first stage in a 2 stage exploitation attempt (whereas second stage is usually the malicious payload shellcode). In the first stage,...
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1answer
1k views

BufferOverflow attack Segment Fault

I'm trying to exploit simple stack overflow vulnerability. But I have trouble writing the exploit.c file. After getting the stack pointer using __asm__("movl %esp, %eax"), I put the address and ...
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1answer
192 views

How to response to Meterpreter HTTP Request sent from client

First of all apologies for mistakes as i am at beginner level. I was exploring Meterpreter HTTP Handler. I have created a payload with meterpreter reverse HTTP and writing my own http server for ...
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255 views

Vulnserver windows 10 only a few exploits

I am playing around with vulnserver on my windows 10 (up to date) host. The weird thing is I only get crashes with KSTET and GTER and nothing with the other ones. As I found this weird I cheated a ...
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1answer
199 views

SegmentSmack exploit

I am studying about SegmentSmack vulnerability. As far as I understood, the vulnerability is due to the fact the reordering the packets in the out-of-order buffer is a very CPU intensive operation. So ...