Package: stalin
Version: 0.11-5
Severity: critical
Tags: security
When `stalin` launches it attempts to detect its environment via
the following code in /usr/lib/stalin/QobiScheme.sc:
(system "uname -m >/tmp/QobiScheme.tmp")
...
(system "rm -f /tmp/QobiScheme.tmp"))
This is a prime example of the insecure use of temporary files,
and allows overwriting any file owned by the user who invokes
stalin.
Trivial demonstration:
$ ln -s /home/steve/HACK /tmp/QobiScheme.tmp
$ ls -l /home/steve/HACK
ls: cannot access /home/steve/HACK: No such file or directory
Now run the sample code:
$ cd /tmp/stalin-0.11/benchmarks
$ ./make-hello
And we see this:
$ ls -l /home/steve/HACK
-rw-r--r-- 1 steve steve 6 Dec 22 08:30 /home/steve/HACK
-- System Information:
Debian Release: 8.2
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL
set to en_US.UTF8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages stalin depends on:
ii dpkg-dev 1.17.26
ii libc6 2.19-18+deb8u1
ii libgc-dev 1:7.2d-6.4
stalin recommends no packages.
stalin suggests no packages.
-- no debconf information
Steve
--
