Cisco Small Business 220 Series Smart Switches Authentication Bypass Vulnerability

## Summary - A vulnerability in the web management interface of Cisco Small Business 220 Series Smart Switches could allow an unauthenticated, remote attacker to upload arbitrary files. The vulnerability is due to incomplete authorization checks in the web management interface. An attacker could exploit this vulnerability by sending a malicious request to certain parts of the web management interface. Depending on the configuration of the affected switch, the malicious request must be sent via HTTP or HTTPS. A successful exploit could allow the attacker to modify the configuration of an affected device or to inject a reverse shell. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: <https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190806-sb220-auth_bypass> ## Affected Products - ## Vulnerable Products This vulnerability affects Cisco Small Business 220 Series Smart Switches running firmware versions prior to 1.1.4.4 with the web management interface enabled. The web management interface is enabled via both HTTP and HTTPS by default. ### Determining Whether the Web Management Interface Is Enabled To determine whether the web management interface is enabled via either HTTP or HTTPS, administrators can use the **show running-config** command on the device CLI. If both of the following lines are present in the configuration, the web management interface is disabled and the device is not vulnerable: > ``` > no ip http server > no ip http secure server > ``` Any other output indicates that the web management interface is enabled on the device. In the web management interface, the **HTTP Service** and **HTTPS Service** are configured under **Security > TCP/UDP Service**. ## Products Confirmed Not Vulnerable Only products listed in the [Vulnerable Products](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190806-sb220-auth_bypass#vp) section of this advisory are known to be affected by this vulnerability. ## Workarounds - There are no workarounds that address this vulnerability. ## Fixed Software - Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license: <https://www.cisco.com/c/en/us/products/end-user-license-agreement.html> Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. When [considering software upgrades](https://tools.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes), customers are advised to regularly consult the advisories for Cisco products, which are available from the [Cisco Security Advisories and Alerts page](https://www.cisco.com/go/psirt), to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. ### Customers Without Service Contracts Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: <https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html> Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. ### Fixed Releases Cisco fixed this vulnerability in Cisco 220 Series Smart Switches Firmware releases 1.1.4.4 and later. ## Exploitation and Public Announcements - The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. ## Source - Cisco would like to thank security researcher bashis for reporting this vulnerability through the VDOO Disclosure Program. ## URL - <https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190806-sb220-auth_bypass> ## Revision History - | Version | Description | Section | Status | Date | | ------- | ----------------------- | ------- | ------ | -------------- | | 1.0 | Initial public release. | — | Final | 2019-August-06 |