Package: postfwd Version: 1.35-1~bpo70+1 Severity: important Dear Maintainer,
The postfwd init script creates a world writable pid file, and does not use start-stop-daemon -n or -u options, so it can be used to kill any process (including root-owned processes). Using the backports postfwd package (postfwd1 alternative): # /etc/init.d/postfwd start Starting postfwd: postfwd. # ls -l /run/postfwd.pid -rw-rw-rw- 1 postfw postfw 5 Jul 22 16:27 /run/postfwd.pid I now log in as a normal user, change that file's contents to the pid of a root-owned process (in my test, it was denyhosts), and then as root I ran "/etc/init.d/postfwd stop" - it killed my target process (denyhosts) instead. I have the default umask, from that same shell: # umask 0022 -- System Information: Debian Release: 7.1 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 3.2.0-4-amd64 (SMP w/8 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages postfwd depends on: ii adduser 3.113+nmu3 ii libnet-dns-perl 0.66-2+b2 ii libnet-server-perl 2.006-1 ii perl 5.14.2-21 postfwd recommends no packages. postfwd suggests no packages. -- Configuration Files: /etc/default/postfwd changed: STARTUP=1 CONF=/etc/postfix/postfwd.cf INET=127.0.0.1 PORT=10040 RUNAS="postfw" ARGS="--summary=600 --cache=600 --cache-rdomain-only --cache-no-size" -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
