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3.9 KiB
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137 lines
No EOL
3.9 KiB
Text
#######################################################################
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Luigi Auriemma
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Application: Firefly Media Server (mt-daapd)
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http://www.fireflymediaserver.org
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Versions: <= 2.4.1 and SVN <= 1699
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Platforms: *nix, Windows, Mac and others
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Bugs: A] partial directory traversal on Windows
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B] authentication bypass on Windows
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C] duplicated HTTP parameter Denial of Service
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D] CPU at 100% with partial queries
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Exploitation: remote
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Date: 03 Dec 2007
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Author: Luigi Auriemma
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e-mail: aluigi@autistici.org
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web: aluigi.org
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#######################################################################
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1) Introduction
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2) Bugs
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3) The Code
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4) Fix
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#######################################################################
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===============
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1) Introduction
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===============
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Firefly Media Server (aka mt-daapd) is an open source server for the
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DAAP protocol used by Roku SoundBridge and iTunes.
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#######################################################################
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=======
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2) Bugs
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=======
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-----------------------------------------
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A] partial directory traversal on Windows
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-----------------------------------------
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Using 3 dots in the HTTP query is possible to get a specific file in
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the parent directory of the Firefly admin-root folder.
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That means that an attacker can download the mt-daapd.conf file which
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contains all the configuration of the server or other files like
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firefly.log and so on.
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If the server is protected by password is enough to use the bug B below
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which allows any external unauthenticated attacker to download these
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files (in short GET /.../mt-daapd.conf works only if no password is
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set, otherwise you must use GET .../mt-daapd.conf or the other methods
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explained there).
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In my tests was possible to go down only of one directory, that's why I
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consider it "partial".
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This problem is exploitable only versus Windows servers.
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-----------------------------------
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B] authentication bypass on Windows
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-----------------------------------
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The usage of a dot '.' or a backslash '\' before the URI (at the place
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of the usual /) or just nothing (GET file.txt HTTP/1.0) allows any
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unauthenticated attacker to download the files from the admin-root
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folder in case the server is protected by password.
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Although the admin-root folder doesn't contain sensitive informations
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it can become very dangerous if used with bug A as written above.
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Note that the trick works only for the "real" files and not for the
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special ones like xml-rpc and the DAAP commands.
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This problem is exploitable only versus Windows servers.
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----------------------------------------------
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C] duplicated HTTP parameter Denial of Service
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----------------------------------------------
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It's possible to terminate the server remotely simply using two or more
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HTTP parameters with the same name (like two Host or User-Agent or just
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any other string).
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-----------------------------------
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D] CPU at 100% with partial queries
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-----------------------------------
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Not really dangerous as the above bugs anyway the server's CPU goes to
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100% while receiving the queries, which means that anyone can just
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connect to it sending only the first line (GET / HTTP/1.0) to cause
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this effect which will continue forever also when the attacker
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disconnects from it.
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#######################################################################
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===========
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3) The Code
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===========
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Example queries to send with netcat:
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http://aluigi.org/poc/fireflyz.zip
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/4699.zip (2007-fireflyz.zip)
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nc localhost 9999 -v -v < file.txt
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#######################################################################
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======
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4) Fix
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======
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The bugs will be fixed in the next versions.
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#######################################################################
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---
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Luigi Auriemma
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http://aluigi.org
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# milw0rm.com [2007-12-07] |