CVE-2011-3870

Puppet v2.7.x antes de v2.7.5, v2.6.x antes de v2.6.11, y v0.25.x, permite a usuarios locales modificar los permisos de archivos de su elección a través de un ataque symlink al archivo authorized_keys de SSH

USN-1223-1 fixed vulnerabilities in Puppet. A regression was found on Ubuntu 10.04 LTS that caused permission denied errors when managing SSH authorized_keys files with Puppet. This update fixes the problem. It was discovered that Puppet unsafely opened files when the k5login type is used to manage files. A local attacker could exploit this to overwrite arbitrary files which could be used to escalate privileges. Ricky Zhou discovered that Puppet did not drop privileges when creating SSH authorized_keys files. A local attacker could exploit this to overwrite arbitrary files as root. It was discovered that Puppet used a predictable filename when using the --edit resource. A local attacker could exploit this to edit arbitrary files or run arbitrary code as the user invoking the program, typically root. Various other issues were also addressed.