NGSSoftware Insight Security Research Advisory Name: Oracle 10g/9i extproc directory traversal Systems Affected: Oracle 10g/9i on all operating systems Severity: Medium Risk Vendor URL: http://www.oracle.com/ Author: David Litchfield [ davidl at ngssoftware.com ] Relates to: http://www.nextgenss.com/advisories/oracle-01.txt Date of Public Advisory: 23rd December 2004 Advisory number: #NISR23122004B Advisory URL: http://www.ngssoftware.com/advisories/oracle23122004B.txt Description *********** The Oracle database server supports PL/SQL, a programming language. PL/SQL can execute external procedures via extproc. Over the past few years there has been a number of vulnerabilities in this area: http://www.nextgenss.com/advisories/oraplsextproc.txt http://www.nextgenss.com/advisories/ora-extproc.txt Extproc has been found to suffer from a directory traversal problem that allows attackers access to arbitray libraries. Details ******* extproc verifies that the library to be loaded is in the $ORACLE_HOME\bin directory. This is to ensure that libraries outside of this directory cannot be loaded. However, there exists a directory traversal issue whereby an attacker can break outside of this constraint. This can allow attackers to access libraries such as libc and msvcrt.dll. By calling the system() function attackers can run arbitrary OS commands. Fix Information *************** A patch (#68) was released for this problem by Oracle. See http://metalink.oracle.com/ for more details. NGSSQuirreL for Oracle (http://www.nextgenss.com/squirrelora.htm), can be used to assess whether your Oracle servers are 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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