CVE-2020-1733

Se encontró un fallo de condición de carrera en Ansible Engine versiones 2.7.17 y anteriores, 2.8.9 y anteriores, 2.9.6 y anteriores, cuando se ejecuta un playbook con un usuario convertido a no privilegiado. Cuando Ansible necesita ejecutar un módulo con un usuario convertido, el directorio temporal es creado en /var/tmp. Este directorio se crea con "umask 77 && mkdir -p (dir)"; Esta operación no tiene un fallo si el directorio ya existe y es propiedad de otro usuario. Un atacante podría tomar ventaja para tomar el control del usuario convertido, ya que el directorio de destino puede ser recuperado iterando "/proc//cmdline".

A race condition flaw was found in Ansible Engine when running a playbook with an unprivileged become user. When Ansible needs to run a module with become user, the temporary directory is created in /var/tmp. This directory is created with "umask 77 && mkdir -p <dir>"; this operation does not fail if the directory already exists and is owned by another user. An attacker could take advantage to gain control of the become user as the target directory can be retrieved by iterating '/proc/<pid>/cmdline'.

Ansible is a simple model-driven configuration management, multi-node deployment, and remote-task execution system. Ansible works over SSH and does not require any software or daemons to be installed on remote nodes. Extension modules can be written in any language and are transferred to managed machines automatically. Issues addressed include information leakage, password leak, and traversal vulnerabilities.