NGSSoftware Insight Security Research Advisory Name: Oracle 10g extproc buffer overflow Systems Affected: Oracle 10g on all operating systems Severity: High 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: #NISR23122004A Advisory URL: http://www.ngssoftware.com/advisories/oracle23122004.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 another buffer overflow vulnerability. Details ******* Oracle 10g imposes a length limit on the library name to be loaded by extproc. However, this length limit can be evaded by passing environment variables as part of the library name. Later on the environment variable is expanded allowing the buffer overflow to be exploited. For example '$PATH' is 5 characters long; this passes the length check. However, when expanded '$PATH' becomes many more characters. Exploitation depends upon the system setup but by trial and error a balance can be found allowing arbitrary code to be executed. No user ID or password is required to exploit this vulnerability. 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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