NGSSoftware Insight Security Research Advisory Name: IBM DB2 XML functions overflows 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: #NISR05012005H Advisory URL: http://www.ngssoftware.com/advisories/db205012005H.txt Description *********** IBM's DB2 database server contain four XML functions that suffer from stack based buffer overflow vulnerabilities. Details ******* The xmlvarcharfromfile suffers from a buffer overflow vulnerability. When and only when, 94 bytes are supplied for the second argument a pointer to the user supplied string is written over the saved return address so when ucnv_open_2_0 (in db2xmlfn.dll) returns - it does so into the string. This allows an attacker to run arbitrary code and elevate privileges. The xmlclobfromfile, xmlfilefromvarchar and xmlfilefromclob functions are also vulnerable. 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@xxxxxxxxxxxxxxx