[UNIX] ProFTPD Long Password Crash

From: support@securiteam.com
Date: 12/25/02

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    From: support@securiteam.com
To: list@securiteam.com
Date: 25 Dec 2002 11:49:22 +0200

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      ProFTPD Long Password Crash
    ------------------------------------------------------------------------

    SUMMARY

    There appears to be a bug in ProFTPD version 1.5.2 and RC versions, the
    bug exists in the login process of the daemon. Specifically in the
    password authentication. After the client has connected to the remote host
    and sends the login username whether be a legit or anonymous, if the user
    then issues the "PASS" command with 12 Kilobytes of data or more as the
    password, the daemon will crash.

    DETAILS

    Vulnerable systems:
     * ProFTPD version 1.5.2 and RC

    Demonstration:
    telnet 127.0.0.1 21
    Connected!
    user burnx
    pass iwatch@porn@<12k+ Buffer>

    ADDITIONAL INFORMATION

    The information has been provided by BuRn-X.

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