The SCP server in Cisco IOS 12.2 through 12.4, when Role-Based CLI Access is enabled, does not enforce the CLI view configuration for file transfers, which allows remote authenticated users with an attached CLI view to (1) read or (2) overwrite arbitrary files via an SCP command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/49423
http://www.vupen.com/english/advisories/2009/0851
http://www.securityfocus.com/bid/34247
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a904c8.shtml
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml