NGSSoftware Insight Security Research Advisory Name: Oracle TZ_OFFSET Remote System Buffer Overrun Systems Affected: All platforms; Oracle9i Database Release 2, 9i Release 1, 8i, 8.1.7, 8.0.6 Severity: High Risk Category: Remote System Buffer Overrun Vendor URL: http://www.oracle.com Author: Mark Litchfield (markat_private) Date: 16th February 2003 Advisory number: #NISR16022003c Description *********** Oracle's database server contains fuctions for use within queries. The TZ_OFFSET function returns the time zone offset corresponding to the value entered based on the date the statement was executed. For example: SELECT TZ_OFFSET('US/Eastern') FROM DUAL; would return the time zone offset value of -04:00. The TZ_OFFSET() function contains a remotely exploitable buffer overflow vulnerability. Details ******* There exists a remotely exploitable buffer overflow vulnerability in the TZ_OFFSET function. By supplying a long character string for the time zone name an attacker can overwrite a saved return address on the stack of Oracle process. Before this issue can be exploited an attacker must be able to log on to the database server with a valid user ID and password, but as the TO_TIMESTAMP_TZ() function can be executed by PUBLIC by default any user of the system can gain control. Any arbitrary code supplied by an attacker would execute with the same privileges as the user running the service; this account is typically "Oracle" on linux/unix based platforms and Local System on Windows based operating systems such as NT/2000/XP. As such this allows for a complete compromise of the data stored in the database and possibly a complete compromise of the operating system. Fix Information *************** NGSSoftware alerted Oracle to this vulnerability on 30th September 2002. Oracle has developed a patch which is available from http://otn.oracle.com/deploy/security/pdf/2003alert50.pdf A check for these issues has been added to NGSSQuirreL for Oracle, a comprehensive automated vulnerability assessment tool for Oracle Database Servers of which more information is available from the NGSSite http://www.ngssoftware.com/software/squirrelfororacle.html Further Information ******************* For further information about the scope and effects of buffer overflows, please see http://www.ngssoftware.com/papers/non-stack-bo-windows.pdf http://www.ngssoftware.com/papers/ntbufferoverflow.html http://www.ngssoftware.com/papers/bufferoverflowpaper.rtf http://www.ngssoftware.com/papers/unicodebo.pdf 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/ http://www.ngsconsulting.com/ Telephone +44 208 401 0070 Fax +44 208 401 0076 enquiriesat_private
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