COMMAND
lpd
SYSTEMS AFFECTED
Red Hat Linux 4.x, 5.x, 6.x (all architectures)
PROBLEM
Following is based on L0pht Security Advisory by Dildog. This is
a relatively complex vulnerability to exploit, but it can be done.
The problem lies in the fact that although SNI (now NAI) found a
whole bunch of problems in BSD LPD two years ago, for some unknown
reason, the majority of these problems still affect Linux LPD.
It's harder to exploit now, but it's still possible. The exploit
allows any user who can print to an LPD server to gain 'bin' user
and 'root' group access to the system remotely.
The problems being exploited here are four-fold.
1. LPD allows remote machines to print files without having access
to LPD, because LPD compares the reversed-resolved peer name of
the accepted socket's address, with the gethostname() name
returned by the machine, and if they're the same, grants access
without question. Hence, if you're the master of your own DNS,
simply make your IP address reverse-resolve to the same
hostname as the LPD server, and you have access to it.
2. LPD allows you to send as many data files to the printer
spooler directory as you want. These files can be binaries,
text, or otherwise.
3. LPD allows you to specify anything you want in the 'control
file' (often named cfBLAHBLAHBLAHBLAH in
/var/spool/lpd/<printer>/ ), even host names and other things
that don't exist.
4. LPD allows you to specify an argument to /usr/sbin/sendmail and
execute it. this is done by specifying that LPD should send
mail back to the print job owner when the print job is
completed ('M' in the cf file). However, the sendmail argument
in the LPD cf file doesn't have to be an email address, it can
be a sendmail option, such as '-C<alternateconfigfilepath>'.
So, we have the unfortunate result that one can send several data
files to print, including a disguised sendmail configuration file,
after which a cf file is sent along, requesting that sendmail be
invoked with the configuration file that is sent over.
Exploit:
http://www3.l0pht.com/~dildog/qib.tgz
Below is exploit, but mimed:
---
Content-Type: application/octet-stream; name="qib.tgz"
Content-Transfer-Encoding: base64
Content-Disposition: inline; filename="qib.tgz"
Content-MD5: uxfXepn/ZLP3OgMiSM/seQ==
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-----
SOLUTION
For each RPM for your particular architecture, run:
rpm -Fvh <filename>
where filename is the name of the RPM. RPMs required:
Intel:
ftp://updates.redhat.com/6.1/i386/lpr-0.48-1.i386.rpm
ftp://updates.redhat.com/5.2/i386/lpr-0.48-0.5.2.i386.rpm
ftp://updates.redhat.com/4.2/i386/lpr-0.48-0.4.2.i386.rpm
Alpha:
ftp://updates.redhat.com/6.1/alpha/lpr-0.48-1.alpha.rpm
ftp://updates.redhat.com/5.2/alpha/lpr-0.48-0.5.2.alpha.rpm
ftp://updates.redhat.com/4.2/alpha/lpr-0.48-0.4.2.alpha.rpm
Sparc:
ftp://updates.redhat.com/6.1/sparc/lpr-0.48-1.sparc.rpm
ftp://updates.redhat.com/5.2/sparc/lpr-0.48-0.5.2.sparc.rpm
ftp://updates.redhat.com/4.2/sparc/lpr-0.48-0.4.2.sparc.rpm
Source packages:
ftp://updates.redhat.com/6.1/SRPMS/lpr-0.48-1.src.rpm
ftp://updates.redhat.com/5.2/SRPMS/lpr-0.48-0.5.2.src.rpm
ftp://updates.redhat.com/4.2/SRPMS/lpr-0.48-0.4.2.src.rpm