New Horrible bug hits Cisco ASA/Firepower/FTD Devices

I just can’t post all the bugs and fixes from Cisco, but over the last day or so Cisco has received thousands of calls on this bug – almost more than any other! So it’s worth your time to read… It’s an older bug, but I’d wager that it recently got added to someone’s attack script…

quick fix note: if you’re not running AnyConnect, then just disable HTTP server…possibly could make you safe until you can permanently fix this…

  • 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.

    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:

  • Vulnerable Products

    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)



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