MikroTik RouterOS – sshd (ROSSSH) Remote Heap Corruption
During an audit the Mikrotik RouterOS sshd (ROSSSH) has been identified to have a remote previous to authentication heap corruption in its sshd component. Exploitation of this vulnerability will allow full access to the router device. This analysis describes the bug and includes a way to get developer access to recent versions of Mikrotik RouterOS using the /etc/devel-login file. This is done by forging a modified NPK file using a correct signature and logging into the device with username ‘devel’ and the password of the administrator. This will drop into a busybox shell for further researching the sshd vulnerability using gdb and strace tools that have been compiled for the Mikrotik busybox platform. Shodanhq.com shows >290.000 entries for the ROSSSH search term. The 50 megs Mikrotik package including the all research items can be downloaded here: http://www.farlight.org/mikropackage.zip https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/28056.zip |