NGSSoftware Insight Security Research Advisory Name: IBM DB2 XML functions file creation vulnerabilities Systems Affected: DB2 8.1 Severity: High risk from remote Vendor URL: http://www.ibm.com/ Author: David Litchfield [ david at ngssoftware.com ] Relates to: http://www.nextgenss.com/advisories/db2-02.txt Date of Public Advisory: 5th January 2005 Advisory number: #NISR05012005I Advisory URL: http://www.ngssoftware.com/advisories/db205012005I.txt Description *********** IBM's DB2 database server contain four XML functions that can be used to read and write files on the system. Details ******* The XMLFileFromVarchar and XMLFileFromClob functions can be used to create files on the remote server. If the file exists the original is overwritten with the new content. The permissions of the account running DB2 is used and not that of the user. This vulnerability can be used to create executable binaries on the remote server as well. An attacker could create a library for example and then load it via "CALL". The XMLVarcharFromFile and XMLClobFromFile can be used to read files from the remote server. Fix Information *************** IBM has written a patch and can be obtained with the latest fixpak. http://www-306.ibm.com/software/data/db2/udb/support/downloadv8.html - DB2 v8.1 http://www-306.ibm.com/software/data/db2/udb/support/downloadv7.html - DB2 v7.x NGSSQuirreL for DB2 (http://www.nextgenss.com/db2.htm) can be used to assess whether your DB2 server is vulnerable to this. About NGSSoftware ***************** NGSSoftware design, research and develop intelligent, advanced application security assessment scanners. Based in the United Kingdom, NGSSoftware have offices in the South of London and the East Coast of Scotland. NGSSoftware's sister company NGSConsulting, offers best of breed security consulting services, specialising in application, host and network security assessments. http://www.ngssoftware.com/ Telephone +44 208 401 0070 Fax +44 208 401 0076 enquiries@private
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