[NT] Remote DoS Vulnerability in NeoModus Direct Connect

From: SecuriTeam (support_at_securiteam.com)
Date: 07/16/03

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Date: 16 Jul 2003 10:19:00 +0200

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      Remote DoS Vulnerability in NeoModus Direct Connect
    ------------------------------------------------------------------------

    SUMMARY

    Direct Connect is "a Windows p2p file-sharing program", a vulnerability in
    the product allows remote attackers to cause the product to hang by
    causing it to connect to multiple hosts (unneeded connections).

    DETAILS

    The Direct Connect client after receiving a "$Connect ToMe..." command
    from hub, tries to connect to specific IP and PORT sent by the Downloader.

    An attacker can send infinite requests to HUB with specific marked ip:port
    causing it to no longer be able to respond to legitimate requests.

    Little example:
    for (;;) { dc_send("$ConnectToMe victim
    www.microsoft.com:%d",sample_port++); }

    Impact:
    The attacked client may be DoS-ed in case of that Internet connection can
    be restarted or disconnected, some clients may send out "Out of Memory"
    message boxes, causing the system to not work properly.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:noreply@sec-labs.hack.pl>
    sec-labs team.

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