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| Oracle 9iAS web service is powered by Apache and provides many application environments to offer services from the site. These include SOAP, PL/SQL, XSQL, and JSP. Two security issues exist in the PL/SQL Apache module - one a buffer overrun vulnerability and the second a directory traversal issue. The directory traversal issue affects only Windows NT/2000. |
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Credit:
The information has been provided by David Litchfield.
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Vulnerable systems:
Oracle version 9iAS
The PL/SQL module exists to allow remote users to call procedures exported by a PL/SQL package stored in the database server. As part of the functionality offered by the PL/SQL module it is possible to remotely administer the Database Access Descriptors and from here access help pages.
Normally, access to the /admin_/ pages is restricted - a userid and password are required but not for the help pages, however a buffer-overrun vulnerability exists in the module whereby a request for an overly long help page will cause the overflow overwriting the saved return address on the stack. By overwriting this saved return address with an address, that contains a "call ESP" or "jmp ESP" instruction a potential attack would land into the user-supplied buffer and any computer code in the buffer would be executed.
On Windows 2000/NT the apache process is running is the security context of the SYSTEM account by default so any code executed would do so without inhibition and an attacker could gain complete control over this system remotely.
The second issue relates to a double URL decoding problem that allows attackers to make a special request for a "help" file and break outside of the web root.
Fix information:
NGSSoftware alerted Oracle to these problems on 18 November who responded quickly with a patch. This patch has been available from the Metalink site (http://metalink.oracle.com) for over a week and both Oracle and NGSSoftware urge Oracle 9iAS customers to download and install this patch if they have not already done so. Oracle's advisory on this issue can be found at http://otn.oracle.com/deploy/security/pdf/modplsql.pdf.
Further to applying the patch it is suggested that the default "/admin_" path be changed to something else. To do edit the wdbsvr.app file located in the $ORACLE_HOME$\Apache\modplsql\cfg directory. Edit the "adminPath" entry.
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