CVE-2017-12148 – Tower: modification of git hooks in SCM repo via upstream playbook execution

https://notcve.org/view.php?id=CVE-2017-12148

A flaw was found in Ansible Tower's interface before 3.1.5 and 3.2.0 with SCM repositories. If a Tower project (SCM repository) definition does not have the 'delete before update' flag set, an attacker with commit access to the upstream playbook source repository could create a Trojan playbook that, when executed by Tower, modifies the checked out SCM repository to add git hooks. These git hooks could, in turn, cause arbitrary command and code execution as the user Tower runs as. Se ha encontrado un fallo en la interfaz de Ansible Tower en versiones anteriores a la 3.1.5 y 3.2.0 con repositorios SCM. Si la definición de un proyecto de Tower (repositorio SCM) no tiene el flag "delete before update" marcado, un atacante con acceso commit al repositorio de origen del playbook upstream podría crear un playbook troyano que, cuando es ejecutado por Tower, modifique el repositorio SCM comprobado para añadiir hooks git. • https://access.redhat.com/errata/RHSA-2017:3005 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-12148 https://access.redhat.com/security/cve/CVE-2017-12148 https://bugzilla.redhat.com/show_bug.cgi?id=1485474 • CWE-20: Improper Input Validation •