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ESB-2003.0516 -- NGSSoftware Insight Security Research Advisory NISR25072003 -- Oracle Extproc Buffer Overflow
28 July 2003
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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0516 -- NGSSoftware Insight Security Research Advisory NISR25072003 Oracle Extproc Buffer Overflow 28 July 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Oracle Extproc Publisher: NGSSoftware Impact: Execute Arbitrary Code/Commands Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- NGSSoftware Insight Security Research Advisory Name: Oracle Extproc Buffer Overflow Systems Affected: Most OS platforms; Oracle9i Database Release 2 and 1, 8i Severity: High Risk Vendor URL: http://www.oracle.com Authors: David Litchfield (firstname.lastname@example.org) Chris Anley (email@example.com) Date: 25th July 2003 Advisory number: #NISR25072003 Description *********** Oracle's RDBMS, a leading database server package, supports stored packages and procedures through the use of PL/SQL. These packages and procedures can be extended by allowing calls to be made to operating system libraries. Any library loaded in this way is done so by a process external to the main RDBMS, namely extproc. Extproc is vulnerable to a classic stack based buffer overflow. This can be exploited remotely by an attacker. No user ID or password is necessary. Details ******* Previously, NGSSoftware discovered a vulnerability in the Oracle package that allowed an attacker to force extproc to load any operating system library and execute any function. This attack did not require a user ID or password. Oracle took steps to resolve this security hole. By way of fixing the vulnerability, attempts to load libraries would be logged but denied unless the call came from the local machine. Remote attempts would be logged as just stated. However, this logging process is vulnerable to a classic stack based buffer overflow vulnerability. By supplying an overly long library name a stack based buffer is overflowed, overwriting the saved return address on the stack. When the vulnerable procedure returns, control over the process' path of execution can be gained. As this does not require a user ID or password it must be stressed that this is a critical vulnerability. On Windows platforms Oracle typically runs in the security context of the LOCAL SYSTEM account and, as such, allows for a complete compromise of the server. On Unix-based systems extproc runs as the 'Oracle' user. As the 'Oracle' user typcially is the owner of the software binaries and data files, an attacker exploiting this can completely subvert the integrity of the database software and data. Fix Information *************** NGSSoftware alerted Oracle to this vulnerability on 30th September 2002. Oracle has reviewed the code and created a patch which is available from: http://otn.oracle.com/deploy/security/pdf/2003alert57.pdf NGSSoftware advise Oracle database customers to review and install the patch as a matter of urgency. A check for this issue already exists in 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/products/squirrelfororacle.html It is further recommend that Oracle DBAs have their network/firewall administrators ensure that the database server is protected from Internet sourced traffic. 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 firstname.lastname@example.org - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to email@example.com and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 Internet Email: firstname.lastname@example.org Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBPySpjCh9+71yA2DNAQFTCwP/Vepa6aqNPFqzue0uBQG1PjZxiTmP/r9l IXY8KZxcw7hbp41BSBHSsGoC6n8D5RwCitO2KIqBG28gw6LqRVzS4j6oSmPtS1+X ZyE97gVC7UcJ/+7I5iakS5wTMGgjMqPluSr4Ur9KdOrey66l+7okX/PFHVm5F3mv ck0vHlz2/DM= =AYX+ -----END PGP SIGNATURE-----
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