147 lines
No EOL
4.2 KiB
Text
147 lines
No EOL
4.2 KiB
Text
#######################################################################
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Luigi Auriemma
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Application: ASG-Sentry
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http://www.asg-sentry.com
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Versions: <= 7.0.0
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Platforms: Windows and Unix
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Bugs: A] arbitrary files deleting
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B] heap-overflow in FxAgent
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C] termination of FxIAList
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D] buffer-overflow in FxIAList
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Exploitation: remote
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Date: 10 Mar 2008
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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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>From vendor's website:
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"The ASG-Sentry family of products is a suite of tools strategically
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engineered to control, monitor, manage, and enhance your network.
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Sentry's tools provide you with full visibility to your network from
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any Web browser. Sentry also allows you to fully instrument your
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company's applications, CPUs, disk space, memory, files, Windows and
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UNIX platforms, and more."
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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] arbitrary files deleting
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---------------------------
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The fcheck.exe (File Check Utility) CGI available in ASG is used for
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handling some index files which contain a list of filenames and
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checksums.
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The -b option of this utility allows the creation of these index files
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and is possible to specify both the name of the output file and,
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optionally, the folder which will be scanned recursively for finding
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and reading the various files to add to the list.
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The first vulnerability is in the possibility for an external attacker
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to use this CGI for overwriting existent files with no data (specifying
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a new folder which will be created by the same program) or with the
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list of filenames described before.
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Naturally is possible to specify both files on the local disks or on
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network shares.
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The second effect instead is the possibility of occupying CPU and disk
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for the scanning of any file in the disk simply specyfing, for example,
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c:\ as folder.
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---------------------------
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B] heap-overflow in FxAgent
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---------------------------
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The FxAgent process running on UDP port 6161 is used for handling the
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various SNMP requests.
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A community field longer than 64 bytes can be used by an attacker to
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exploit a heap-overflow.
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--------------------------
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C] termination of FxIAList
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--------------------------
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FxIAList is a service which runs on the TCP port 6162 and is used for
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the logging operations which include the commands "exit", "trace on"
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"verbose", "trace off" and the name of the log file to create
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(xxxx.xx.xx) and its content.
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The main problem is that the server doesn't require authentication so
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anyone can send the "exit" command and the service will just terminate.
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------------------------------
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D] buffer-overflow in FxIAList
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------------------------------
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The same service described before is affected also by a stack based
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buffer-overflow which happens during the copying of the data we want
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to write to the log file (max 1023 bytes) in a buffer of only 500.
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#######################################################################
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===========
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3) The Code
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===========
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http://aluigi.org/poc/asgulo.zip
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/5229.zip (2008-asgulo.zip)
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A]
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http://SERVER:6161/snmx-cgi/fcheck.exe?-b+..\../..\boot.ini
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http://SERVER:6161/snmx-cgi/fcheck.exe?-b+c:\windows\win.ini
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http://SERVER:6161/snmx-cgi/fcheck.exe?-b+c:\file.txt+c:\
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http://SERVER:6161/snmx-cgi/fcheck.exe?-b+\host\document.txt
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this link for the network share is correct because Apache converts
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any backslash to double so that one becomes \\host\\document.txt
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B]
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nc SERVER 6161 -v -v -u < asgulo_fxagent.txt
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C]
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nc SERVER 6162 -v -v -w 1 < asgulo-ialist1.txt
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D]
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nc SERVER 6162 -v -v -w 1 < asgulo-ialist2.txt
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#######################################################################
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======
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4) Fix
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======
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No fix
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#######################################################################
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# milw0rm.com [2008-03-10] |