Re: [c-nsp] Cisco Security Advisory: Cisco ASA Software IKEv1 and IKEv2 Buffer Overflow Vulnerability

15 Feb 2016


      In previous release 9.1(6) this line was ok:
nat (inside,outside) source static obj-1.0.0.36_32 obj-1.0.0.36_32
destination static obj-1.0.0.36_32 obj-1.0.0.36_32

In 9.1.(7) wasn't working anymore, so the solution was to add *no-proxy-arp
*at the end:
nat (inside,outside) source static obj-1.0.0.36_32 obj-1.0.0.36_32
destination static obj-1.0.0.36_32 obj-1.0.0.36_32 *no-proxy-arp*

On Mon, Feb 15, 2016 at 1:48 PM, Roberto <roberto@ipnetworks.it> wrote:
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Hello,
excuse me for this direct email: but about the
https://www.reddit.com/r/networking/comments/433kqx/cisco_asa_not_recording_...
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upgraded from 9.0(5) to 9.1(7)
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Solved !
"Disable Proxy ARP" must be checked on NAT bypass rules (former nat 0).
are you indicating for example
that previously on 9.0(5) was:
nat (inside,outside) source static obj-1.0.0.36_32 obj-1.0.0.36_32
destination static obj-1.0.0.36_32  obj-1.0.0.36_32 route-lookup
and now on 9.1(7) is:
nat (inside,outside) source static obj-1.0.0.36_32 obj-1.0.0.36_32
destination static obj-1.0.0.36_32 obj-1.0.0.36_32 *no-proxy-arp*
route-lookup
Best Regards,
_________________________________
Roberto Taccon
e-mail: roberto@ipnetworks.it
mobile: +39 340 4751352
fax: +39 045 4850850
skype: roberto.taccon
-----Messaggio originale-----
Da: NANOG [mailto:nanog-bounces@nanog.org] Per conto di Adrian M
Inviato: lunedì 15 febbraio 2016 10.06
A: nanog@nanog.org
Oggetto: Re: [c-nsp] Cisco Security Advisory: Cisco ASA Software IKEv1 and
IKEv2 Buffer Overflow Vulnerability
Solved !
"Disable Proxy ARP" must be checked on NAT bypass rules (former nat 0).
On Thu, Feb 11, 2016 at 3:53 PM, Adrian M <adrian.minta@gmail.com> wrote:
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Be careful, It appears that something is broken with ARP on this release.
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We have no ARP on lan interface, and somebody else has a similar problem:
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https://www.reddit.com/r/networking/comments/433kqx/cisco_asa_not_reco
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rding_an_arp_entry/
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On Wed, Feb 10, 2016 at 10:36 PM, Sadiq Saif <lists@sadiqs.com> wrote:
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Update your ASAs folks, this is a critical one.
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-------- Forwarded Message --------
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Subject: [c-nsp] Cisco Security Advisory: Cisco ASA Software IKEv1
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and
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IKEv2 Buffer Overflow Vulnerability
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Date: Wed, 10 Feb 2016 08:06:51 -0800
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From: Cisco Systems Product Security Incident Response Team
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<psirt@cisco.com>
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Reply-To: psirt@cisco.com
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To: cisco-nsp@puck.nether.net
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CC: psirt@cisco.com
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Cisco Security Advisory: Cisco ASA Software IKEv1 and IKEv2 Buffer
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Overflow Vulnerability
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Advisory ID: cisco-sa-20160210-asa-ike
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Revision 1.0
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For Public Release 2016 February 10 16:00  GMT (UTC)
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+--------------------------------------------------------------------
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Summary
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=======
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A vulnerability in the Internet Key Exchange (IKE) version 1 (v1) and
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IKE version 2 (v2) code of Cisco ASA Software could allow an
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unauthenticated, remote attacker to cause a reload of the affected
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system or to remotely execute code.
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The vulnerability is due to a buffer overflow in the affected code area.
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An attacker could exploit this vulnerability by sending crafted UDP
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packets to the affected system. An exploit could allow the attacker
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to execute arbitrary code and obtain full control of the system or to
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cause a reload of the affected system.
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Note: Only traffic directed to the affected system can be used to
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exploit this vulnerability. This vulnerability affects systems
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configured in routed firewall mode only and in single or multiple
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context mode. This vulnerability can be triggered by IPv4 and IPv6
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traffic.
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Cisco has released software updates that address this vulnerability.
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This advisory is available at the following link:
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http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
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cisco-sa-20160210-asa-ike
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