[UNIX] RSniff DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 04/11/04

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    To: list@securiteam.com
Date: 11 Apr 2004 15:05:44 +0200

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      RSniff DoS
    ------------------------------------------------------------------------

    SUMMARY

     < http://www.cse.sc.edu/~madamanc/projects.html > Rsniff is "a remote
    sniffer for Linux written by Rajesh Kumar Madamanchi". A vulnerability in
    the RSniff server allows an attacker to crash the server remotely.

    DETAILS

    Vulnerable Systems:
     * RSniff 1.0

    Vulnerable Code:

    153 {
    154 printf ("RSniff Server: Authentication failed!\n");
    155 continue;
    156 }

    This code section is being run when a client connects to the Rsniff server
    and sends a command different than Authenticate (a 32 bit number equal to
    zero) or simply closes the connection without sending data. The result is
    the restart of the binding loop, so the socket will be recreated however,
    the old socket will not be closed.

    After 1024 connections the server will finish all the available file
    descriptors and will not accept new clients.

    Exploit Code:
    Exploit code can be found at:
    <http://aluigi.altervista.org/poc/emptyconn.zip>
    http://aluigi.altervista.org/poc/emptyconn.zip

    Solution:
    Add "close (new_sockfd);" at line 156:

    153 {
    154 printf ("RSniff Server: Authentication failed!\n");
    155 close (new_sockfd); /* PATCH */
    156 continue;
    157 }

    Rajesh has been contacted and will release a new version soon.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:aluigi@altervista.org> Luigi
    Auriemma.

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