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Cisco VPN 3000 Concentrator Multiple Vulnerabilities
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Secunia Advisory:
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SA8746
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Release Date:
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2003-05-08
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Last Update:
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2004-08-13
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Popularity:
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6,611 views
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Critical:
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Moderately critical
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Impact:
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Security Bypass
DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| OS: | Cisco VPN 3000 Concentrator
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Description:
Cisco has released a security bulletin describing three vulnerabilities in VPN 3000 Concentrator. These allow malicious people to access internal hosts or cause a Denial of Service.
If IPSec has been configured to use TCP, it is possible to access hosts on the private network on the same port that is used for IPSec communication. However, this requires that the hosts on the private network has been assigned routeable addresses or that a malicious person has access to an external host where traffic is routed to the private network.
Another vulnerability exists in the SSH service. It is possible to cause the VPN 3000 Concentrator to reload by sending a malformed initialization packet.
The third vulnerability allows malicious people to slow down the VPN 3000 Concentrator by sending malformed ICMP messages to any interface.
Solution:
An update is available from:
http://www.cisco.com/tacpage/sw-center/vpn/3000/
You may also prevent these attacks by filtering traffic at your perimeter firewall and by creating a filter on the private interface of the VPN 3000 Concentrator to prevent traffic to the private network.
Provided and/or discovered by:
Reported by vendor.
Changelog:
2004-08-13: Updated link in "Solution" section.
Original Advisory:
http://www.cisco.com/warp/public/707/cisco-sa-20030507-vpn3k.shtml
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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