Cisco has patched a remote code execution (RCE) vulnerability bearing a “perfect” CVSS score of 10.0 that affects its Adaptive Security Appliance (ASA) software.On 29 January, the American multinational technology conglomerate publicly recognized the security issue (CVE-2018-0101) and revealed that it affects the ASA software found in the following 10 Cisco products:3000 Series Industrial Security Appliance (ISA)ASA 5500 Series Adaptive Security AppliancesASA 5500-X Series Next-Generation FirewallsASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series RoutersASA 1000V Cloud FirewallAdaptive Security Virtual Appliance (ASAv)Firepower 2100 Series Security ApplianceFirepower 4110 Security ApplianceFirepower 9300 ASA Security ModuleFirepower Threat Defense Software (FTD)ASA software delivers firewall capabilities for ASA devices at the enterprise level. It also offers integrated VPN capabilities and facilitates site-to-site VPN on a per-context basis. Essential to the Cisco ASA Family, ASA software makes up part of the Firepower Threat Defense platform, unified software which offers next-generation firewall solutions.The technology company explains how this particular flaw works in a security advisory:The vulnerability is due to an attempt to double free a region of memory when the webvpn feature is enabled on the Cisco ASA device. An attacker could exploit this vulnerability by sending multiple, crafted XML packets to a webvpn-configured interface on the affected system. An exploit could allow the attacker to execute arbitrary code and obtain full control of the system, or cause a reload of the affected device.There are no workarounds for this flaw, which has received a CVSS score of Base 10.0.While the Cisco Product Security Incident Response Team (PSIRT) is aware of “public knowledge of the vulnerability,” it is not currently aware of any malicious exploits.Customers with ASA devices running ASA software releases prior to 9.1 as well as 9.3 and 9.5 should move to a supported release. There are also updates available for Firepower Threat Defense 6.2.2, the version which first introduced the remote access VPN feature.
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