When BIG-IP is licensed for Appliance mode, Admin and Resource administrator roles can by-pass BIG-IP Appliance mode restrictions to overwrite critical system files. (CVE-2018-15321)
Attackers with a high-privilege level can overwrite critical system files, which in turn bypasses security controls that limit TMOS Shell (tmsh) commands. This scenario is possible when the Administrator or Resource Administrator roles are grantedtmshaccess. Resource Administrator roles must have**tmsh **access to perform this attack.
Note: F5 does not consider the capability of Advanced Shell (bash) access in this vulnerability, as users granted that level of access can simply perform any command as root. This vulnerability is an issue for Appliance mode, users who are grantedtmsh access, and for the Resource Administrator role when operating in standard, non-Appliance mode.
Impact
When the BIG-IP system is licensed for Appliance mode, Administrator and Resource Administrator roles can by-pass BIG-IP Appliance mode restrictions to overwrite critical system files.