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Cisco IOS RADIUS Authentication Security Bypass
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Secunia Advisory:
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SA15850
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Release Date:
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2005-06-30
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Last Update:
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2005-07-12
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Critical:
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Moderately critical
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Impact:
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Security Bypass
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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 IOS 12.x
Cisco IOS R12.x
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| | CVE reference: | CVE-2005-2105 (Secunia mirror)
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Description:
A vulnerability has been reported in Cisco IOS, which can be exploited by malicious people to bypass RADIUS authentication.
The vulnerability is caused due to an error in the AAA (Authentication, Authorization, and Accounting) RADIUS authentication method making it possible to bypass it by supplying an overly long username.
Successful exploitation bypasses the RADIUS authentication.
The vulnerability only affects devices running the following version of Cisco IOS and configured with a RADIUS authentication and a fallback method to "none" with "local" or no other method in between:
* 12.2T based trains
* 12.3 based trains
* 12.3T based trains
* 12.4 based trains
Solution:
Fixes are available (see patch matrix in vendor advisory).
http://www.cisco.com/warp/public/707/cisco-sa-20050629-aaa.shtml#software
Use an additional authentication method other than "local" between RADIUS authentication and the "none" fallback method.
Remove the "none" fallback method (this may cause problems if the RADIUS server becomes unavailable).
Provided and/or discovered by:
Reported by vendor.
Changelog:
2005-07-12: Added CVE reference.
Original Advisory:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sa-20050629-aaa.shtml
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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