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Cisco IPsec VPN Implementation Group Name Enumeration Weakness
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Secunia Advisory:
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SA15765
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Release Date:
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2005-06-21
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Last Update:
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2006-04-20
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Popularity:
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10,920 views
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Critical:
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Not critical
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Impact:
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Exposure of system information
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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 Adaptive Security Appliance (ASA) 7.x
Cisco PIX 7.x
Cisco VPN 3000 Concentrator
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Subscribe:
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| CVE reference: | CVE-2005-2025
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Description:
A weakness has been reported in certain Cisco products, which can be exploited by malicious people to gain knowledge of certain information.
The problem is that the device returns different responses depending on whether or not a valid group name is supplied when the device is configured for group name authentication and using a pre-shared key.
Once a valid group name is guessed, this can further be used to obtain the hash of the group password.
The following products are affected:
* Cisco VPN 3000 Series Concentrators (models 3005, 3015, 3020, 3030, 3060, and 3080).
* Cisco PIX 500 Series Security Appliances
* Cisco ASA 5500 Series Adaptive Security Appliances
Solution:
Update to a fixed version.
Cisco VPN 3000 Series Concentrators:
Update to version v4.1.7G or 4.7.2.
Cisco PIX 500 Series Security Appliances:
Update to version 7.0(4).
Cisco ASA 5500 Series Adaptive Security Appliances:
Update to version 7.0(4).
Use another authentication method.
Provided and/or discovered by:
Roy Hills, NTA Monitor.
Changelog:
2005-06-24: Added CVE reference and link to Cisco advisory.
2006-04-20: Added information about affected PIX and ASA devices. Updated affected versions of Cisco VPN 3000 Series Concentrator.
Original Advisory:
NTA Monitor:
http://www.nta-monitor.com/news/vpn-flaws/cisco/VPN-Concentrator/index.htm
Cisco:
http://www.cisco.com/warp/public/707/cisco-sn-20050624-vpn-grpname.shtml
http://www.cisco.com/univercd/cc/td/doc/product/vpn/vpn3000/4_7/471con3k.htm
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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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