The Cisco Adaptive Security Appliance and Firepower Appliance vulnerability patched over a year ago continues to be targeted by attackers in the wild, as exploitation attempts have increased in frequency over the past several weeks.

CVE-2018-0296: Vulnerability in Cisco ASA and Firepower Appliances Sees Spike in Exploit Attempts

A vulnerability in the web interface of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. It is also possible on certain software releases that the ASA will not reload, but an attacker could view sensitive system information without authentication by using directory traversal techniques. The vulnerability is due to lack of proper input validation of the HTTP URL. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. An exploit could allow the attacker to cause a DoS condition or unauthenticated disclosure of information. This vulnerability applies to IPv4 and IPv6 HTTP traffic. This vulnerability affects Cisco ASA Software and Cisco Firepower Threat Defense (FTD) Software that is running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 1000V Cloud Firewall, ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv). Cisco Bug IDs: CSCvi16029.

A vulnerability in the web interface of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. It is also possible on certain software releases that the ASA will not reload, but an attacker could view sensitive system information without authentication by using directory traversal techniques. The vulnerability is due to lack of proper input validation of the HTTP URL. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device.
An exploit could allow the attacker to cause a DoS condition or unauthenticated disclosure of information. This vulnerability applies to IPv4 and IPv6 HTTP traffic. This vulnerability affects Cisco ASA Software and Cisco Firepower Threat Defense (FTD) Software that is running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 1000V Cloud Firewall, ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv). Cisco Bug IDs: CSCvi16029.

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The remote Cisco Firepower Threat Defense (FTD) Software is missing a vendor-supplied security patch. It is, therefore, affected by a vulnerability in the web interface due to improper validation of the HTTP URL. An unauthenticated, remote attacker can exploit this, via a specially crafted HTTP request, to cause a DoS condition or unauthenticated disclosure of information. This vulnerability applies to IPv4 and IPv6 HTTP traffic.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to its self-reported version the Cisco Adaptive Security Appliance (ASA) software running on the remote device is affected by multiple vulnerabilities. Please see the included Cisco BIDs and Cisco Security Advisories for more information.

ID	Name	Product	Family	Type	Severity
506154	Rockwell Automation Allen-Bradley Stratix 5950 Improper Input Validation (CVE-2018-0296)	Tenable OT Security	Tenable.ot	Remote	high
124172	Cisco FTD Web Services DoS (cisco-sa-20180606-asaftd)	Nessus	CISCO	Local	high
110686	Cisco ASA Web Services DoS (cisco-sa-20180606-asaftd)	Nessus	CISCO	Local	high

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