NGSSoftware Insight Security Research Advisory
Name: Oracle unauthenticated remote system compromise Systems Affected: All platforms; Oracle9i Database Release 2, 9i Release 1, 8i, 8.1.7, 8.0.6 Severity: Critical Risk Category: Remote System Buffer Overrun Vendor URL: http://www.oracle.com Author: Mark Litchfield (firstname.lastname@example.org) Date: 16th February 2003 Advisory number: #NISR16022003a
Oracle is the leader in the database market with a 54% market share lead under ERP (Enterprise Resource Planning). The database server is vulnerable to a remotely exploitable buffer overflow vulnerability. What exacerbates this problem is that no valid User ID or password is required by an attacker.
There is a remotely exploitable buffer overflow vulnerability in the authentication process with the Oracle Database Server. By supplying an overly long username when attempting to log onto the database server an attacker can overflow a stack based buffer overwriting the saved return address. 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. As most client applications for Oracle will tuncate the length of the username that can be supplied to the database an attacker would need to write their own Oracle "Authenticator" to exploit this issue. That said, NGSSoftware has found one client application that will allow longer usernames so to test if you are vulnerable to this issue, use the LOADPSP utility usually found in "bin" directory found under the OracleHomeInstallDirectory. On Windows, for example, run:
C:\ora9ias\BIN>loadpsp -name -user LONGUSERNAME/tiger@iasdb myfile
NGSSoftware alerted Oracle to this vulnerability on 30th September 2002. Oracle has reviewed the code and created a patch which is available from:
NGSSoftware advise Oracle database customers to review and install the patch as a matter of urgency.
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
It is further recommend that Oracle DBAs have their network/firewall administrators ensure that the database server is protected from Internet sourced traffic.
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
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.
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