Questions tagged [exploit-development]
For questions about development of software which takes advantage of exploits (vulnerabilities in security systems).
193
questions
1
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0answers
23 views
How does glibc prevent malloc unlink exploits?
The classic malloc overflow, of overwriting pointers in a free chunk, to cause free() unlink to overwrite an arbitrary location with an arbitrary value, is no longer possible with modern glibc (...
0
votes
0answers
40 views
64 Bit ELF Buffer Overflow Not working possibly due to if statement
I wrote the following:
#include <stdio.h>
int win(){
printf("Won!\n");
return 0;
}
int vulnerable(){
char buffer[20];
memset(buffer, 0, 10);
printf("Input: &...
0
votes
1answer
61 views
How can an ELF binary call a Windows API from WSL(2) to deploy a payload?
In September 2021 Black Lotus Labs (BLL) posted a blog entry discussing a payload loader that was:
written in Python
compiled to an ELF exe using PyInstaller in Debian in WSL
and "injected into ...
0
votes
0answers
45 views
What are the latest techniques/advances in binary exploitation? Conversely, latest advances in defending against them?
I know the wording might be off so bear with me a minute to explain what I'm trying to find:
If you never touched the topic, you start off with stack buffer overflows, then you learn about ret2libc, ...
4
votes
2answers
250 views
Are buffer overflow and similar attacks still possible?
The majority of my cyber security background comes in the form of web application vulnerability testing, and whilst I do have a degree of prior experience in studying and performing application ...
1
vote
1answer
286 views
How to read memory from format string exploit correctly
I'm trying to solve a problem on format string exploitation in which I have to overwrite anything in a specific address. Since the target address has a null byte at the begining, I need to write it at ...
0
votes
0answers
138 views
Can't overwrite EIP in bufferoverflow example
I am trying to make a simple buffer-overflow exploit on an example program to understand binary exploitation a bit better. The goal is to simple write shellcode on the stack and execute it.
However, ...
1
vote
1answer
99 views
Is a single infoleak enough to break ASLR if you don't have access to the binary?
With a single infoleak and access to the binary you can calculate the other addresses. Is this still possible when you don't have access to the binary?
1
vote
0answers
54 views
WebApp Windows Command Injection without "||"
I've found an application that allows arbitrary file upload (client side validation on file extensions), however those files are not stored in a folder which is accessible by the webserver, so a web ...
0
votes
0answers
73 views
Exploiting buffer overflow in 64-bit macOS executable
I'm following this tutorial to create a buffer overflow demo. The article illustrates a 32-bit executable, but I'm feeling adventurous and decided to do a 64-bit one. Below is the deliberately ...
0
votes
1answer
65 views
Could a virus force a phone to download an app and spread it?
I'm writing a sci-fi story that includes a malicious app that spreads globally. The developer publishes an app without knowing it's infected, and it spreads because it forces phones to download it. ...
0
votes
1answer
88 views
How can I generate a binary from an payload without any other addons?
For example how do I turn the payload/windows/format_all_drives into an exe without any other fancy addons?
(I am talking about using msfvenom FYI)
1
vote
2answers
132 views
How do attackers determine ROP gadgets remotely?
Being gadgets change per each system and architecture (do they?), how would an attacker be able to determine the offsets of various Return Oriented Programming gadgets, would an attacker first need to ...
0
votes
1answer
144 views
Assigning memory address of shellcode to buffer (for buffer overflow input)
I am attempting to exploit HEVD kernel driver buffer overflow challenge:
https://github.com/hacksysteam/HackSysExtremeVulnerableDriver
However when running the below code my windows 7 machine doesn't ...
1
vote
1answer
352 views
Understanding ret2libc return address location
I recently was studying x86 buffer overflows + ret2libc attacks from https://www.ret2rop.com/2018/08/return-to-libc.html and I noticed the order is as follows:
bytes to fill buffer + address of system ...
0
votes
1answer
571 views
What is source of bad characters exist in buffer overflows
I'm new to exploit development and while watching a tutorial I came across the topic of "Bad character identification". I'm referring to the process of sending all possible characters to the ...
0
votes
1answer
87 views
Is it possible to use ROP to call legitimate functions even if the stack is not executable?
I read about the hardware protection that blocks the CPU from jumping to stack address. But hacker may still edit the return address to an address in code memory that shouldn't run at that moment.
For ...
1
vote
0answers
168 views
Exploit - Code execution without assembly call instruction, int etc on ia_64
Found a bug in a function in a loop where I can go past a loop in assignment where value is read from past malloced memory
The function has no call, int or other assembly instructions afterwards.
...
1
vote
1answer
129 views
Are there any projects/papers on approaching exploit development with AI/automation?
I'm looking for research on the topic if at all possible or readings about efforts into this.
Drilling down into binaries via fuzzing/fingerprinting for known vulnerable binary patterns and a little ...
0
votes
1answer
154 views
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 ...
1
vote
1answer
341 views
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('...
0
votes
0answers
89 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 ...
0
votes
0answers
72 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 ...
2
votes
1answer
663 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);
...
0
votes
3answers
958 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 ...
1
vote
1answer
122 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?
1
vote
4answers
237 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.
...
0
votes
0answers
131 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 ...
2
votes
1answer
158 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 ; ...
1
vote
1answer
153 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 ...
0
votes
1answer
147 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 ...
2
votes
2answers
497 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 &...
1
vote
0answers
74 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 ...
1
vote
1answer
480 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 ...
1
vote
0answers
277 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/...
2
votes
1answer
72 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, ...
2
votes
0answers
108 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 ...
1
vote
1answer
664 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 ...
0
votes
1answer
130 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, ...
1
vote
1answer
413 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 ...
2
votes
1answer
378 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 ...
1
vote
1answer
1k 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 <...
2
votes
1answer
158 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 ...
0
votes
1answer
657 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 ...
1
vote
1answer
810 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 ...
1
vote
0answers
224 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 ...
2
votes
0answers
121 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 ...
1
vote
1answer
170 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 ...
2
votes
1answer
2k 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 ...
0
votes
1answer
190 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 ?...
