int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
{
    char *str;
     ASN1_TIME atm;
     long offset;
     char buff1[24], buff2[24], *p;
    int i, j;
 
     p = buff1;
    i = ctm->length;
     str = (char *)ctm->data;
     if (ctm->type == V_ASN1_UTCTIME) {
        if ((i < 11) || (i > 17))
             return 0;
         memcpy(p, str, 10);
         p += 10;
         str += 10;
     } else {
        if (i < 13)
             return 0;
         memcpy(p, str, 12);
         p += 12;
         str += 12;
     }
 
     if ((*str == 'Z') || (*str == '-') || (*str == '+')) {
         *(p++) = '0';
         *(p++) = '0';
     } else {
         *(p++) = *(str++);
         *(p++) = *(str++);
        /* Skip any fractional seconds... */
        if (*str == '.') {
             str++;
            while ((*str >= '0') && (*str <= '9'))
                str++;
         }
 
     }
     *(p++) = 'Z';
     *(p++) = '\0';
 
    if (*str == 'Z')
         offset = 0;
    else {
         if ((*str != '+') && (*str != '-'))
             return 0;
         offset = ((str[1] - '0') * 10 + (str[2] - '0')) * 60;
         offset += (str[3] - '0') * 10 + (str[4] - '0');
         if (*str == '-')
            offset = -offset;
    }
    atm.type = ctm->type;
    atm.flags = 0;
    atm.length = sizeof(buff2);
    atm.data = (unsigned char *)buff2;

    if (X509_time_adj(&atm, offset * 60, cmp_time) == NULL)
        return 0;

    if (ctm->type == V_ASN1_UTCTIME) {
        i = (buff1[0] - '0') * 10 + (buff1[1] - '0');
        if (i < 50)
            i += 100;           /* cf. RFC 2459 */
        j = (buff2[0] - '0') * 10 + (buff2[1] - '0');
        if (j < 50)
            j += 100;

        if (i < j)
            return -1;
        if (i > j)
            return 1;
    }
    i = strcmp(buff1, buff2);
    if (i == 0)                 /* wait a second then return younger :-) */
        return -1;
    else
        return i;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.