cpio vulnerabilities

A path traversal vulnerability was found in the CPIO utility. During extraction, the archiver could follow symlinks outside of the intended directory, allowing files to be written in arbitrary directories through symlinks.

cpio 2.11, when using the --no-absolute-filenames option, allows local users to write to arbitrary files via a symlink attack on a file in an archive.

The cpio program on FreeBSD 2.1.0, Debian GNU/Linux 3.0, and possibly other operating systems uses a 0 umask when creating files with the -O (archive) or -F options, resulting in files being created with mode 0666.