Educause Security Discussion mailing list archives
Re: blocking .ZIP attachments
From: Jim Bollinger <JBollinger () WLU EDU>
Date: Fri, 20 Aug 2004 09:19:03 -0400
Those who replied that they are not blocking those zip attachments which are "scannable"- I hope your software has a limit to how big the expanded attachment can be. We experienced a denial of service when we received ZIPs whose expanded size was 2 GB, when their compressed size was < 10MB (our attachment size limit). The expansion of the attachment on disk to allow scanning can fill disk partitions. We're blocking at this time and don't plan to go back. Jim Bollinger Systems and Network Engineer Washington and Lee University Lexington, VA 24450 540-458-8743
jcb () LSU EDU 8/19/2004 5:53:20 PM >>>
I apologize if this topic has been discussed before, but I couldn't find any direct mention of this specific issue recently. We have a problem with viruses penetrating the campus "under the radar" so to speak. Before a new virus is detected and the anti-virus update is written, received, and distributed, we have a window of vulnerability. In the past we have lost a considerable amount of time repairing these outbreaks. The vector for many of these infections has been through attachments especially .ZIP's. At first we were intermittently blocking .zip and other attachments; going back and forth between blocking and accepting as each new virus appeared. We found that keeping the zip's blocked had a big impact on minimizing the impact of new virii. We've gotten to the point where we cringe at the thought of unblocking .zip's and would like to make it permanent. Before I propose this to the administration, I wanted to see if anyone could comment on whether they are, or are not, blocking zip's and other attachments and if not, what other solutions they have considered. Thanks. John Borne Asst Dir for System Support Computing Services Louisiana State University ********** Participation and subscription information for this EDUCAUSE Discussion Group discussion list can be found at http://www.educause.edu/cg/. ********** Participation and subscription information for this EDUCAUSE Discussion Group discussion list can be found at http://www.educause.edu/cg/.
Current thread:
- blocking .ZIP attachments John C Borne (Aug 19)
- <Possible follow-ups>
- Re: blocking .ZIP attachments Jason Richardson (Aug 19)
- Re: blocking .ZIP attachments Smotherman, Brian (Aug 19)
- Re: blocking .ZIP attachments Gary Flynn (Aug 19)
- Re: blocking .ZIP attachments Dave Koontz (Aug 19)
- Re: blocking .ZIP attachments Tim Lane (Aug 19)
- Re: blocking .ZIP attachments John C Borne (Aug 19)
- Re: blocking .ZIP attachments Davis, Thomas R. (Aug 20)
- Re: blocking .ZIP attachments Theresa M Rowe (Aug 20)
- Re: blocking .ZIP attachments Jim Bollinger (Aug 20)
- Re: blocking .ZIP attachments F.L.Ferreri (Aug 20)
- Re: blocking .ZIP attachments Matthew Keller (Aug 20)
- Re: blocking .ZIP attachments Cal Frye (Aug 20)
- Re: blocking .ZIP attachments Jenny Gluck (Aug 20)
- Re: blocking .ZIP attachments Michael_Maloney (Aug 20)
- Re: blocking .ZIP attachments Jeffrey I. Schiller (Aug 20)
- Re: blocking .ZIP attachments Scott Barker (Aug 20)
- Re: blocking .ZIP attachments Lucas, Bryan (Aug 20)