A vulnerability in the implementation of the Lua interpreter integrated in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code with root privileges on the underlying Linux operating system of an affected device.
The vulnerability is due to insufficient restrictions on the allowed Lua function calls within the context of user-supplied Lua scripts. A successful exploit could allow the attacker to trigger a heap overflow condition and execute arbitrary code with root privileges on the underlying Linux operating system of an affected device.
Update November 19, 2019: Advisory version 1.1 contained a Fixed Software table advising that Vulnerability Database (VDB) Update 329 contained a fix for this vulnerability for Cisco FTD Software. It has been discovered since release of VDB Update 329 that this fix does not provide adequate mitigation for this vulnerability. Customers are advised to wait for an update to this advisory and for a new fix to be posted.
Cisco has released software updates that address this vulnerability for Cisco ASA Software and will release additional software updates that will address this vulnerability for ASA Software and for FTD Software. There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191112-asa-ftd-lua-rce
Security Impact Rating: High
CVE: CVE-2019-15992
