Cisco has released a firmware update for its RV220W Wireless Network Security Firewall product to address a critical vulnerability that allows remote attackers to gain administrative privileges on the device.
The flaw, tracked as CVE-2015-6319, has been described as a management authentication bypass issue caused by insufficient checking of the HTTP request headers sent to the device’s administration interface.
A remote, unauthenticated attacker can send specially crafted HTTP requests containing malicious SQL statements to the device in order to bypass authentication and access it with administrative privileges.
The vulnerability, reported to the company by an anonymous researcher via Beyond Security's SecuriTeam Secure Disclosure program, affects Cisco RV220W Wireless Network Security Firewall devices running firmware versions prior to 184.108.40.206.
Cisco says it’s not aware of any instances in which the security hole has been exploited for malicious purposes, but the company has informed customers that they can check Authentication, Accounting, and Authorization (AAA) log files for suspicious login data to see if their devices have been compromised.
An attack exploiting this vulnerability only works if the remote management feature is enabled on the targeted device. Users who cannot apply the firmware update can disable remote management or restrict access to the feature.
Cisco has also released updates to address a high severity denial-of-service (DoS) vulnerability in its Wide Area Application Service (WAAS) device. The flaw, which has the identifier CVE-2015-6421, exists in the Common Internet File System (CIFS) optimization feature present in WAAS appliances, Virtual WAAS (vWAAS), and WAAS modules. The bug affects WAAS versions 5.1.1d through 5.5.
A remote, unauthenticated attacker can exploit this vulnerability by sending malicious CIFS traffic to the targeted device, which can cause a DoS condition.
Cisco is not aware of any exploit attempts in the wild. Workarounds are available for customers who cannot install the software updates.