CVE-2018-19044

keepalived 2.0.8 no buscaba nombres de ruta con enlaces simbólicos al escribir datos en un archivo temporal al llamar a PrintData o PrintStats. Esto permitía a los usuarios locales sobrescribir archivos arbitrarios si fs.protected_symlinks se establece en 0, tal y como lo demuestra un enlace simbólico desde /tmp/keepalived.data o /tmp/keepalived.stats a /etc/passwd.

The keepalived utility provides simple and robust facilities for load balancing and high availability. The load balancing framework relies on the well-known and widely used IP Virtual Server kernel module providing layer-4 load balancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage a load balanced server pool according to the health of the servers. Keepalived also implements the Virtual Router Redundancy Protocol to achieve high availability with director failover. An improper path name validation was addressed.