mirrorselect: Insecure temporary file creation
Gentoo Linux Security Advisory
||GLSA 200412-05 / mirrorselect
||December 07, 2004
||May 22, 2006: 04
All supported architectures
mirrorselect is vulnerable to symlink attacks, potentially allowing a local
user to overwrite arbitrary files.
mirrorselect is a tool to help select distfiles mirrors for Gentoo.
Ervin Nemeth discovered that mirrorselect creates temporary files in
world-writable directories with predictable names.
A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
mirrorselect is executed, this would result in the file being
overwritten with the rights of the user running the utility, which
could be the root user.
There is no known workaround at this time.
All mirrorselect users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-portage/mirrorselect-0.89"