The Authentication Proxy feature in Cisco IOS does not properly handle invalid AAA return codes from RADIUS and TACACS+ servers, which allows remote attackers to bypass authentication in opportunistic circumstances via a connection attempt that triggers an invalid code, as demonstrated by a connection attempt with a blank password, aka Bug IDs CSCuo09400 and CSCun16016.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0607
Reference (s):
- BID:72794
- URL: http://www.securityfocus.com/bid/72794
- CISCO:20150226 Cisco IOS Software Authentication Proxy Bypass Vulnerability
- URL: http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0607
- http://tools.cisco.com/security/center/viewAlert.x?alertId=37711