NGSSoftware Insight Security Research Advisory Name: Oracle 10g/9i extproc local command execution 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: #NISR23122004C Advisory URL: http://www.ngssoftware.com/advisories/oracle23122004C.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 is intended only to accept requests from the Oracle database server but local users can still execute commands bypassing this restriction. Details ******* No authentication takes place when extproc is asked to load a library and execute a function. This allows local users to run commands as the Oracle user (oracle on unix and system on Windows). If configured properly, under 10g, extproc runs as nobody on *nix systems so the risk posed here is minimal but still present. Fix Information *************** Oracle has responded saying this is "expected behaviour" and they are not going to fix it. NGSSoftware believes this does pose a security risk. 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@xxxxxxxxxxxxxxx
