Security Basics mailing list archives
RE: Cisco Workaround
From: Ghaith Nasrawi <libero () aucegypt edu>
Date: Sat, 26 Jul 2003 01:13:31 +0300
Well your solutions assume that I know the source of traffic coming to my server, which is a very restrictive case that isn't very realistic with today's world. Also, I tried the exploit with the latest IOS on 2651 router before adding the new ACLs, and it's still vulnerable. ./Ghaith =============== Today is the tomorrow you worried about yesterday -----Original Message----- From: Tim Donahue [mailto:TDonahue () haynesconstruction com] Sent: Friday, July 25, 2003 10:43 PM To: 'Ghaith Nasrawi' Cc: firewalls () securityfocus com; security-basics () securityfocus com Subject: RE: Cisco Workaround Hmmm.... Why don't you open up the protocols from the addresses that you need. Isn't this a standard firewalling technique? Plus I believe that they said that there are new versions of IOS that are not vulnerable to this attack, which means that you can upgrade IOS and resolve the issute all together. Tim Donahue
-----Original Message----- From: Ghaith Nasrawi [mailto:libero () aucegypt edu] Sent: Friday, July 25, 2003 11:33 AM Cc: firewalls () securityfocus com; security-basics () securityfocus com Subject: RE: Cisco Workaround Well, my question is; what the hell if I was using any of these protocols?? Didn't cisco think of that?? They should have suggested a more decent solution. ./Ghaith =============== Today is the tomorrow you worried about yesterday -----Original Message----- From: jamesworld () intelligencia com [mailto:jamesworld () intelligencia com] Sent: Wednesday, July 23, 2003 6:48 PM To: Alvaro Gordon-Escobar Cc: firewalls () securityfocus com; security-basics () securityfocus com Subject: Re: Cisco Workaround Alvaro, No. The protocol blocked by the access-list is protocol 53 not protocol TCP or protocol UDP port 53. If you need further info, let me know, -James At 09:15 7/23/2003, Alvaro Gordon-Escobar wrote:will this access list modification prevent my internal DNSserver fromupdates to it self from my telco's DNS server? access-list 101 deny 53 any any access-list 101 deny 55 any any access-list 101 deny 77 any any access-list 101 deny 103 any any !--- insert any other previously applied ACL entries here !--- you must permit other protocols through to allow normal !--- traffic -- previously defined permit lists will work !--- or you may use the permit ip any any shown here access-list 101 permit ip any any Thanks in advance ~alvaro Escobar ----------------------------------------------------------------------- --------------------------------------------------------------------------- ----- -------------------------------------------------------------- ---------- --- -------------------------------------------------------------- ---------- ---- -------------------------------------------------------------- ------------- -------------------------------------------------------------- --------------
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Current thread:
- Re: Cisco Workaround, (continued)
- Re: Cisco Workaround john (Jul 24)
- Re: Cisco Workaround joshua sahala (Jul 24)
- Re: Cisco Workaround Jac (Jul 24)
- Re: Cisco Workaround Luis Enrique Londono (Jul 23)
- Re: Cisco Workaround bryan_khoo (Jul 24)
- RE: Cisco Workaround dave kleiman (Jul 24)
- Re: Cisco Workaround igenge2 (Jul 24)
- Re: Cisco Workaround Stephane Nasdrovisky (Jul 24)
- RE: Cisco Workaround Jofre, Sebastian (Jul 24)
- RE: Cisco Workaround Tim Donahue (Jul 28)
- RE: Cisco Workaround Ghaith Nasrawi (Jul 28)
- RE: Cisco Workaround Noonan, Wesley (Jul 28)
- RE: Cisco Workaround Martin, Olivier (Jul 28)
- Re: Cisco Workaround joshua sahala (Jul 28)
- RE: Cisco Workaround Ghaith Nasrawi (Jul 29)
- Re: Cisco Workaround stephane nasdrovisky (Jul 29)
- Re: Cisco Workaround Jac (Jul 30)
- RE: Cisco Workaround Todd Mitchell - lists (Jul 30)
- Re: Cisco Workaround James Fields (Jul 30)
- Re: Cisco Workaround Jac (Jul 31)
- RE: Cisco Workaround Adam Overlin (Jul 31)
- Re: Cisco Workaround stephane nasdrovisky (Jul 29)