Shadow Brokers' Tools Pose Zero-Day Risks, Cisco and Fortinet Warn
The Equation Group breach now appears to be very real, as tools emerge that have vendors scrambling.When news of an alleged breach of the National Security Agency-backed Equation Group first surfaced , there was much speculation about whether the sale by Shadow Brokers of pilfered tools was real or a hoax. As it turns out, multiple security vendors are now confirming that at least some of the tools the Shadow Brokers are selling are real, with critical zero-day vulnerabilities now being exposed in the process. Among the tools exposed in the first batch that Shadow Brokers made available are two with somewhat interesting and unique names: EPICBANANAS and EXTRABACON. The tools are designed to circumvent network security devices, including firewalls, from multiple vendors in an attempt to give an attacker access to a target network. Networking giant Cisco is among the targeted vendors and has confirmed that the two attack tools represent real risks of its Cisco ASA and PIX firewall products. The EXTRABACON exploit is being labeled CVE-2016-6366 and is a Simple Network Management Protocol (SNMP) remote code execution vulnerability. "The EXTRABACON exploit targets a buffer overflow vulnerability in the SNMP code of the Cisco ASA, Cisco PIX and Cisco Firewall Services Module," Omar Santos, principal engineer of Cisco's Product Security Incident Response Team (PSIRT), wrote in a blog post. "An attacker could exploit this vulnerability by sending crafted SNMP packets to an affected Cisco product."
Santos also provides command-line details of how the exploit works against the ASA. The EXTRABACON tool affects all versions of ASA software, and Cisco has now released intrusion-prevention System (IPS) rules that can detect the issue. The clarity and detail that the Cisco PSIRT post provides is part of an effort the company announced in October 2015 to provide its customers with as much transparency and information as possible on Cisco vulnerabilities.