[Bug 1769] New: proftpd instructions

blfs-bugs at linuxfromscratch.org blfs-bugs at linuxfromscratch.org
Sun Jan 1 15:09:34 PST 2006


           Summary: proftpd instructions
           Product: Beyond LinuxFromScratch
           Version: a-SVN
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: BOOK
        AssignedTo: blfs-book at linuxfromscratch.org
        ReportedBy: bdubbs at linuxfromscratch.org
         QAContact: blfs-book at linuxfromscratch.org

>From Alexander E. Patrakov:

the current BLFS instructions for proftpd include the following:

install_user=proftpd install_group=proftpd \
    ./configure --prefix=/usr --sysconfdir=/etc \

This results in the /usr/sbin/proftpd binary owned by the proftpd user. This is
very wrong. Daemon binaries should be owned by root but run as a user.

Suppose that someone finds a security hole in proftpd that gives read-write
access outside /home/ftp with the rights of the proftpd user (i.e., the user for
anonymous access). This hole becomes a root hole then, because the attacker can
overwrite /usr/sbin/proftpd and wait for a server reboot.

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