Weak TCP Sequence Numbers in Sonicwall SOHO Firewall

From: Dan Ferris (danfat_private)
Date: Wed Jul 25 2001 - 16:17:28 PDT

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    This may not seem bad, but to me it seems that this defeats the point of NAT
    if somebody can steal your sessions.  Note the section on TCP sequence
    prediction.  This was a Sonicwall SOHO firewall.
    
    =======
    Host  (192.168.1.254) appears to be up ... good.
    Initiating SYN half-open stealth scan against  (192.168.1.254)
    Adding TCP port 80 (state open).
    The SYN scan took 8 seconds to scan 1523 ports.
    For OSScan assuming that port 80 is open and port 1 is closed and neither
    are firewalled
    Interesting ports on  (192.168.1.254):
    (The 1518 ports scanned but not shown below are in state: closed)
    Port       State       Service
    23/tcp     filtered    telnet
    67/tcp     filtered    bootps
    80/tcp     open        http
    137/tcp    filtered    netbios-ns
    514/tcp    filtered    shell
    
    TCP Sequence Prediction: Class=64K rule
                             Difficulty=1 (Trivial joke)
    
    Sequence numbers: 3EC519BD 3EC613BD 3EC70DBD 3EC807BD 3EC901BD 3EC9FBBD
    Remote operating system guess: Accelerated Networks - High Speed Integrated
    Access VoDSL
    OS Fingerprint:
    TSeq(Class=64K)
    T1(Resp=Y%DF=N%W=2000%ACK=S++%Flags=AS%Ops=MNW)
    T2(Resp=N)
    T3(Resp=Y%DF=N%W=2000%ACK=O%Flags=A%Ops=)
    T4(Resp=Y%DF=N%W=2000%ACK=O%Flags=R%Ops=)
    T5(Resp=Y%DF=N%W=0%ACK=S++%Flags=AR%Ops=)
    T6(Resp=Y%DF=N%W=0%ACK=O%Flags=R%Ops=)
    T7(Resp=Y%DF=N%W=0%ACK=S%Flags=AR%Ops=)
    PU(Resp=Y%DF=N%TOS=0%IPLEN=38%RIPTL=148%RID=E%RIPCK=0%UCK=0%ULEN=134%DAT=E)
    
    
    Nmap run completed -- 1 IP address (1 host up) scanned in 8 seconds
    ======
    
    Dan Ferris
    Percept Technology
    mailto:danfat_private
    http://www.percept.com
    



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