FedCIRC Advisory FA-99-09 Revised: June 18, 1999 Originally released: June 16, 1999 Source: CERT/CC Systems Affected * Machines running Microsoft Internet Information Server 4.0 I. Description Buffer overflow vulnerabilities affecting Microsoft Internet Information Server 4.0 have been discovered in several libraries, including libraries that handle .HTR, .STM, and .IDC files. A tool to exploit at least one of the vulnerabilities has been publicly released. II. Impact These vulnerabilities allow remote intruders to execute arbitrary code with the privileges of the IIS server. Additionally, intruders can use this vulnerability to crash vulnerable IIS processes. III. Solution Microsoft has released and updated Microsoft Security Bulletin MS99-019, which points to a patch for these vulnerabilities. We encourage you to read this bulletin, available from [1]http://www.microsoft.com/security/bulletins/ms99-019.asp We will update this advisory as more information becomes available. Please check the CERT/CC Web site for the most current revision. _________________________________________________________________ Our thanks to Jason Garms and Scott Culp of Microsoft for providing information contained in this advisory. ______________________________________________________________________ This document is available from: [2]http://www2.fedcirc.gov/advisories/FA-99-09.html ______________________________________________________________________ FedCIRC Contact Information Email: [3]fedcirc@fedcirc.gov Phone: +1 888-282-0870 (24-hour toll-free hotline) Phone: +1 412-268-6321 (24-hour hotline) Fax: +1 412-268-6989 Postal address: FedCIRC CERT Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh PA 15213-3890 U.S.A. FedCIRC personnel answer the hotline 08:00-20:00 EST(GMT-5) / EDT(GMT-4) Monday through Friday; they are on call for emergencies during other hours, on U.S. holidays, and on weekends. Using encryption We strongly urge you to encrypt sensitive information sent by email. Our public PGP key is available from [4]http://www2.fedcirc.gov/keys.html If you prefer to use DES, please call the FedCIRC hotline for more information. Getting security information FedCIRC publications and other security information are available from our web site [5]http://www.fedcirc.gov/ FedCIRC (Federal Computer Incident Response Capability) is operated by the CERT/CC for the U.S. General Services Administration. FedCIRC provides security services to U.S. Federal civilian agencies. Copyright 1999 Carnegie Mellon University. Conditions for use, disclaimers, and sponsorship information can be found in [6]http://www.cert.org/legal_stuff.html * "CERT" and "CERT Coordination Center" are registered in the U.S. Patent and Trademark Office. ______________________________________________________________________ NO WARRANTY Any material furnished by Carnegie Mellon University and the Software Engineering Institute is furnished on an "as is" basis. Carnegie Mellon University makes no warranties of any kind, either expressed or implied as to any matter including, but not limited to, warranty of fitness for a particular purpose or merchantability, exclusivity or results obtained from use of the material. Carnegie Mellon University does not make any warranty of any kind with respect to freedom from patent, trademark, or copyright infringement. Revision History June 16, 1999: Initial release June 18, 1999: Added information about .STM and .IDC files. References 1. http://www.microsoft.com/security/bulletins/ms99-019.asp 2. http://www2.fedcirc.gov/advisories/FA-99-09.html 3. mailto:fedcirc@fedcirc.gov 4. http://www2.fedcirc.gov/keys.html 5. http://www.fedcirc.gov/ 6. http://www.cert.org/legal_stuff.html