Red Hat Linux Advisory: unzip

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Red Hat Security Advisory

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1 .Topic:

Updated unzip packages resolving a vulnerability allowing
arbitrary files to be overwritten are now available.

2. Relevant releases/architectures:

Red Hat Linux 7.1 – i386
Red Hat Linux 7.2 – i386, ia64
Red Hat Linux 7.3 – i386
Red Hat Linux 8.0 – i386
Red Hat Linux 9 – i386

3. Problem description:

The unzip utility is used for manipulating archives, which are
multiple files stored inside of a single file.

A vulnerabilitiy in unzip version 5.50 and earlier allows
attackers to overwrite arbitrary files during archive extraction by
placing invalid (non-printable) characters between two “.”
characters. These non-printable characters are filtered, resulting
in a “..” sequence. The Common Vulnerabilities and Exposures
project (cve.mitre.org/) has
assigned the name CAN-2003-0282 to this issue.

This erratum includes a patch ensuring that non-printable
characters do not make it possible for a malicious .zip file to
write to parent directories unless the “-:” command line parameter
is specified.

Users of unzip are advised to upgrade to these updated packages,
which are not vulnerable to this issue.

4. Solution:

Before applying this update, make sure all previously released
errata relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.
Only those RPMs which are currently installed will be updated.
Those RPMs which are not installed but included in the list will
not be updated. Note that you can also use wildcards (*.rpm) if
your current directory only contains the desired RPMs.

Please note that this update is also available via Red Hat
Network. Many people find this an easier way to apply updates. To
use Red Hat Network, launch the Red Hat Update Agent with the
following command:

up2date

This will start an interactive process that will result in the
appropriate RPMs being upgraded on your system.

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

97301 – vulnerability in unzip 5.50 allows malicious zip file to
write to ../

6. RPMs required:

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/unzip-5.50-11.src.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/unzip-5.50-11.i386.rpm

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/unzip-5.50-11.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/unzip-5.50-11.i386.rpm

ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/unzip-5.50-11.ia64.rpm

Red Hat Linux 7.3:

SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/unzip-5.50-11.src.rpm

i386:
ftp://updates.redhat.com/7.3/en/os/i386/unzip-5.50-11.i386.rpm

Red Hat Linux 8.0:

SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/unzip-5.50-12.src.rpm

i386:
ftp://updates.redhat.com/8.0/en/os/i386/unzip-5.50-12.i386.rpm

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/unzip-5.50-14.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/unzip-5.50-14.i386.rpm

7. Verification:

MD5 sum Package Name

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627c65d2643152f360a4b7f8ebacf993
7.1/en/os/SRPMS/unzip-5.50-11.src.rpm
c37b3635f768ca248ef6486f38a4cfb1
7.1/en/os/i386/unzip-5.50-11.i386.rpm
627c65d2643152f360a4b7f8ebacf993
7.2/en/os/SRPMS/unzip-5.50-11.src.rpm
c37b3635f768ca248ef6486f38a4cfb1
7.2/en/os/i386/unzip-5.50-11.i386.rpm
e1cb9d0c5312667c601e3a04e160ea3c
7.2/en/os/ia64/unzip-5.50-11.ia64.rpm
627c65d2643152f360a4b7f8ebacf993
7.3/en/os/SRPMS/unzip-5.50-11.src.rpm
c37b3635f768ca248ef6486f38a4cfb1
7.3/en/os/i386/unzip-5.50-11.i386.rpm
b06d287ae9708615d9c8201addd84ceb
8.0/en/os/SRPMS/unzip-5.50-12.src.rpm
14e662c115aab0fd073602a2637c306a
8.0/en/os/i386/unzip-5.50-12.i386.rpm
da4837981a5363b178185c3d53bfe3f5
9/en/os/SRPMS/unzip-5.50-14.src.rpm
12b5697f11ad09959e9f51d570c37268
9/en/os/i386/unzip-5.50-14.i386.rpm

These packages are GPG signed by Red Hat for security. Our key
is available from http://www.redhat.com/security/keys.html

You can verify each package with the following command:

rpm –checksig -v <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:

md5sum <filename>

8. References:

http://marc.theaimsgroup.com/?l=bugtraq&m=105259038503175

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0282

9. Contact:

The Red Hat security contact is <secalert@redhat.com>. More
contact details at http://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.