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                   Red Hat, Inc. Security Advisory

Synopsis:          Updated mgetty packages are now available.
Advisory ID:       RHSA-2000:059-02
Issue date:        2000-09-07
Updated on:        2000-09-11
Product:           Red Hat Linux
Keywords:          N/A
Cross references:  N/A
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1. Topic:

The mgetty-sendfax package contains a vulnerability which allows any
user with access to the /var/tmp directory to destroy any file on any
mounted filesystem.

2. Relevant releases/architectures:

Red Hat Linux 5.2 - i386, alpha, sparc
Red Hat Linux 6.0 - i386, alpha, sparc
Red Hat Linux 6.1 - i386, alpha, sparc
Red Hat Linux 6.2 - i386, alpha, sparc
Red Hat Linux 6.2E - i386, alpha, sparc

3. Problem description:

The faxrunq and faxrunqd commands supplied with the mgetty-sendfax package
use a file named /var/spool/fax/outgoing/.lastrun to keep track of the date
and time when the faxrunq command was last run.  /var/tmp is a
world-writable directory, and no check is made to ensure that .lastrun is
not a symbolic link to another file.  A malicious user can create a
symbolic link named /var/spool/fax/outgoing/.lastrun which points to any
file on a mounted filesystem, and that file's contents will be destroyed
the next time faxrunq is run.

4. Solution:

For each RPM for your particular architecture, run:

rpm -Fvh [filename]

where filename is the name of the RPM.

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

11874 - Mgetty packages default config is a security threat
17178 - one more security problem with mgetty
17179 - security problem with mgetty


6. RPMs required:

Red Hat Linux 5.2:

sparc:
ftp://updates.redhat.com/5.2/sparc/mgetty-voice-1.1.22-1.5.x.sparc.rpm
ftp://updates.redhat.com/5.2/sparc/mgetty-viewfax-1.1.22-1.5.x.sparc.rpm
ftp://updates.redhat.com/5.2/sparc/mgetty-sendfax-1.1.22-1.5.x.sparc.rpm
ftp://updates.redhat.com/5.2/sparc/mgetty-1.1.22-1.5.x.sparc.rpm

alpha:
ftp://updates.redhat.com/5.2/alpha/mgetty-voice-1.1.22-1.5.x.alpha.rpm
ftp://updates.redhat.com/5.2/alpha/mgetty-viewfax-1.1.22-1.5.x.alpha.rpm
ftp://updates.redhat.com/5.2/alpha/mgetty-sendfax-1.1.22-1.5.x.alpha.rpm
ftp://updates.redhat.com/5.2/alpha/mgetty-1.1.22-1.5.x.alpha.rpm

i386:
ftp://updates.redhat.com/5.2/i386/mgetty-voice-1.1.22-1.5.x.i386.rpm
ftp://updates.redhat.com/5.2/i386/mgetty-viewfax-1.1.22-1.5.x.i386.rpm
ftp://updates.redhat.com/5.2/i386/mgetty-sendfax-1.1.22-1.5.x.i386.rpm
ftp://updates.redhat.com/5.2/i386/mgetty-1.1.22-1.5.x.i386.rpm

sources:
ftp://updates.redhat.com/5.2/SRPMS/mgetty-1.1.22-1.5.x.src.rpm

Red Hat Linux 6.0, 6.1, and 6.2:

sparc:
ftp://updates.redhat.com/6.2/sparc/mgetty-voice-1.1.22-1.6.x.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/mgetty-viewfax-1.1.22-1.6.x.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/mgetty-sendfax-1.1.22-1.6.x.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/mgetty-1.1.22-1.6.x.sparc.rpm

i386:
ftp://updates.redhat.com/6.2/i386/mgetty-voice-1.1.22-1.6.x.i386.rpm
ftp://updates.redhat.com/6.2/i386/mgetty-viewfax-1.1.22-1.6.x.i386.rpm
ftp://updates.redhat.com/6.2/i386/mgetty-sendfax-1.1.22-1.6.x.i386.rpm
ftp://updates.redhat.com/6.2/i386/mgetty-1.1.22-1.6.x.i386.rpm

alpha:
ftp://updates.redhat.com/6.2/alpha/mgetty-voice-1.1.22-1.6.x.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/mgetty-viewfax-1.1.22-1.6.x.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/mgetty-sendfax-1.1.22-1.6.x.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/mgetty-1.1.22-1.6.x.alpha.rpm

sources:
ftp://updates.redhat.com/6.2/SRPMS/mgetty-1.1.22-1.6.x.src.rpm

7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
b27b3fda4c0d0e7ac7b74353c4f1f145  5.2/SRPMS/mgetty-1.1.22-1.5.x.src.rpm
b652205f79715212bef4c98f0d624f6d  5.2/alpha/mgetty-1.1.22-1.5.x.alpha.rpm
dcc1ae6fa8cf601c3418d0affbf91039  5.2/alpha/mgetty-sendfax-1.1.22-1.5.x.alpha.rpm
fe85f4fe5367d619b160987e912b7e24  5.2/alpha/mgetty-viewfax-1.1.22-1.5.x.alpha.rpm
c2d5a314915ade00c98ba3fe4ce5712b  5.2/alpha/mgetty-voice-1.1.22-1.5.x.alpha.rpm
f2fb0d8bf7f3b2140a3e21170399bc7c  5.2/i386/mgetty-1.1.22-1.5.x.i386.rpm
e3773830446a4fba7555d70732a2938d  5.2/i386/mgetty-sendfax-1.1.22-1.5.x.i386.rpm
245f0b0f00e1687401edd65db86cd7a9  5.2/i386/mgetty-viewfax-1.1.22-1.5.x.i386.rpm
f49678f5fc10297473b9415f7148fe94  5.2/i386/mgetty-voice-1.1.22-1.5.x.i386.rpm
45ff2fa65ed3411734a58162880ca19f  5.2/sparc/mgetty-1.1.22-1.5.x.sparc.rpm
6b69116697c9636a9d3fc59f209d74ff  5.2/sparc/mgetty-sendfax-1.1.22-1.5.x.sparc.rpm
9db43716f48517d4bd6cf22253e975f1  5.2/sparc/mgetty-viewfax-1.1.22-1.5.x.sparc.rpm
1fabca053ad9a520d3065c00d31bb9d9  5.2/sparc/mgetty-voice-1.1.22-1.5.x.sparc.rpm
7b50848c4ef1d27d2c40e9f5e2c74f75  6.2/SRPMS/mgetty-1.1.22-1.6.x.src.rpm
47d1b922a94ffe984a19285f2296907c  6.2/alpha/mgetty-1.1.22-1.6.x.alpha.rpm
52c43e4d8195ee483459c0b273f064f4  6.2/alpha/mgetty-sendfax-1.1.22-1.6.x.alpha.rpm
3927d2ead5ef89b93f3799190af12535  6.2/alpha/mgetty-viewfax-1.1.22-1.6.x.alpha.rpm
4eb7013dee45011c6c7958be40e000fe  6.2/alpha/mgetty-voice-1.1.22-1.6.x.alpha.rpm
bd6ee4b93aa742d6cbc92bbae031c345  6.2/i386/mgetty-1.1.22-1.6.x.i386.rpm
3539dc2f5c5bef8819a8bc781e0d3405  6.2/i386/mgetty-sendfax-1.1.22-1.6.x.i386.rpm
3a17e82b398d69c294952773a098c105  6.2/i386/mgetty-viewfax-1.1.22-1.6.x.i386.rpm
e61f3413ce93cd30c41eeb29caef2177  6.2/i386/mgetty-voice-1.1.22-1.6.x.i386.rpm
03d15f11dafe000ad55c3290974ae670  6.2/sparc/mgetty-1.1.22-1.6.x.sparc.rpm
7ae49a988c81a450cabc7f2ca6d24a76  6.2/sparc/mgetty-sendfax-1.1.22-1.6.x.sparc.rpm
b903bc9f9531ed015248e7e000f58884  6.2/sparc/mgetty-viewfax-1.1.22-1.6.x.sparc.rpm
985ee71161bb9bb1c73325115e0150f3  6.2/sparc/mgetty-voice-1.1.22-1.6.x.sparc.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
    http://www.redhat.com/corp/contact.html

You can verify each package with the following command:
    rpm --checksig  <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg <filename>

8. References:

http://www.securityfocus.com/bid/1612

Thanks also go to Stan Bubrouski, Gert Doering, and mal@mail1.nai.net.


Copyright(c) 2000 Red Hat, Inc.