############################################################### ID: S21SEC-011-en Title: Multiple vulnerabilities in BEA WebLogic Server Date: 7/01/2003 Status: Patch published Scope: Remote command execution Platforms: Linux, Windows 2000, probably others Author: llmora Location: http://www.s21sec.com/en/avisos/s21sec-011-en.txt Release: Public ############################################################### S 2 1 S E C http://www.s21sec.com Multiple vulnerabilities in BEA WebLogic Server About BEA WebLogic Server ------------------------- WebLogic Server is a quite extended BEA J2EE applications server (http://www.bea.com). Vulnerabilities description --------------------------- WebLogic offers a web management console through which you can manage the web server contents, load servlets, etc. One of the functionalities it offers is that you can upload files to the remote server for its publication. The process in charge of managing the file upload validates the user credentials and then calls an internal weblogic servlet to upload the file, that does not require any authentication. This internal servlet can be publically accessed and therefore it is possible to upload files to the server without any kind of authentication. Files can be uploaded to any location in the remote server, not limiting to the tree of WebLogic directories (in Windows 2000 it is possible to upload files to any disk drive). If you know the directory where the Weblogic server applications have been installed (such as in a default installation) there is the possibility to upload a malicious application that will allow an attacker to execute commands with the premissions of the user executing the Weblogic server. Additionally, the internal servlet offers different operations that allow, without any authentication: * Download arbitrary files from the remote server * Obtain the users, groups and passwords (salted and hashed) of WebLogic Affected Versions and platforms ------------------------------- These vulnerabilities have been verified to work in the WebLogic version for Windows and Linux, although we think that they are not specific to the platform. The current vulnerabilities vary in the different versions, the following table shows which vulnerabilities are present in each version: UPLOAD DOWNLOAD PASSWORD WebLogic 6.0 X X WebLogic 6.1 X X X WebLogic 7.0 X The WebLogic Server 5.1 version does not present any of the previously mentioned vulnerabilities. Solution -------- The vendor was notified and published a patch to solve these vulnerabilities. More information on how to get and install the patch can be found in BEA's security advisory BEA03-28.00 (http://dev2dev.bea.com/resourcelibrary/advisoriesnotifications/BEA03-28.jsp ). If upgrading is not an option, there is a temporary workaround for the problem which consists in the installation of a ConnectionFilter class to filter out requests to the administration server, avoiding explotation of the vulnerability from the outside world. In order to apply this workaround the administration and application servers must be running on separate ports. Once they are separated the ConnectionFilter will filter connections based on the request source address. S21SEC developed a ConnectionFilter class that allows filtering based on the source address and destination port. This filter along with detailed instructions on how to install and configure the filter can be downloaded for free from the downloads section in S21SEC website, at: http://www.s21sec.com/download/s21sec-weblogic-connectionfilter-1.0.tar.gz Alternatively, connections to the administrative server can be filtered by using an IP filtering device. Additional information ---------------------- These vulnerabilities have been found and researched by: Lluis Mora llmoraat_private You can find the latest version of this advisory at: http://www.s21sec.com/en/avisos/s21sec-011-en.txt And other S21SEC advisories at http://www.s21sec.com/en/avisos/
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