NGSSoftware Insight Security Research Advisory Name: Lotus Domino Web Server Host/Location Buffer Overflow Vulnerability Systems Affected: Release 6.0 Severity: Critical Risk Category: Remote System Buffer Overrun Vendor URL: http://www.lotus.com Author: Mark Litchfield (markat_private) Date: 17th February 2003 Advisory number: #NISR17022003a Description *********** Lotus Domino and Notes together provide a featured enterprise collaboration system with Domino providing application server services. Details ******* Lotus Domino 6 suffers from a remotley exploitable buffer overrun vulnerability when performing a redirect operation. When building the 302 Redirect response, the server takes the client provided "Host" header and implants this value into the "Location" server header. By requesting certain documents or views in certain databases the server can be forced to perform a redirect operation and by supplying an overly long string for the hostname, a buffer can be overflowed allowing an attacker to gain control of the Domino Web Services process. By default these databases can be accessed by anonymous users. Any arbitray code supplied will run in the context of the account running Domino allowing an attacker to gain control of the server. Fix Information *************** IBM Lotus Notes and Domino Release 6.0.1 is now available and being marketed as the first maintenance release. IBM say if customers haven't already upgraded or migrated to Notes and Domino 6, now is the time to move and start reaping the benefits of this existing and highly praised release. Release 6.0.1 includes fixes to enhance the quality and reliability of the Notes and Domino 6 products. It does not however mention any security issues, and NGS would strongly advise to upgrade as soon as possible not to just tp "reap the benefits" but to secure the server and data against possible attacks. The upgrade / patch can be obtained from http://www14.software.ibm.com/webapp/download/search.jsp?q=&cat=&pf=&k=&dt=& go=y&rs=ESD-NOTECLNTi&S_TACT=&S_CMP=&sb=r A check for this issue has been added to DominoScan R2, a comprehensive automated intelligent assessment tool for Lotus Domino Servers of which more information is available from the NGSSite http://www.ngssoftware.com/software/dominoscan.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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