RHSA-2005:074-01: Low: rsh security update
Posted on: 05/18/2005 11:13 AM

A rsh security update is available for Red Hat Enterprise Linux 3

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Red Hat Security Advisory

Synopsis: Low: rsh security update
Advisory ID: RHSA-2005:074-01
Advisory URL: https://rhn.redhat.com/errata/RHSA-2005-074.html
Issue date: 2005-05-18
Updated on: 2005-05-18
Product: Red Hat Enterprise Linux
CVE Names: CAN-2004-0175
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1. Summary:

Updated rsh packages that fix various bugs and a theoretical security issue are now available.

This update has been rated as having low security impact by the Red Hat Security Response Team

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

3. Problem description:

The rsh package contains a set of programs that allow users to run commands on remote machines, login to other machines, and copy files between machines, using the rsh, rlogin, and rcp commands. All three of these commands use rhosts-style authentication.

The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses rcp to copy files from a malicious server. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0175 to this issue.

These updated packages also address the following bugs:

The rexec command failed with "Invalid Argument", because the code used sigaction() as an unsupported signal.

The rlogind server reported "SIGCHLD set to SIG_IGN but calls wait()" message to the system log because the original BSD code was ported incorrectly to linux.

The rexecd server did not function on systems where client hostnames were not in the DNS service, because server code called gethostbyaddr() for each new connection.

The rcp command incorrectly used the "errno" variable and produced erroneous error messages.

The rexecd command ignored settings in the /etc/security/limits file, because the PAM session was incorrectly initialized.

The rexec command prompted for username and password regardless of the ~/.netrc configuration file contents. This updated package contains a patch that no longer skips the ~/.netrc file.

All users of rsh should upgrade to these updated packages, which resolve these issues.

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.

If up2date fails to connect to Red Hat Network due to SSL Certificate Errors, you need to install a version of the
up2date client with an updated certificate. The latest version of up2date is available from the Red Hat FTP site and may also be downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

5. RPMs required:

Red Hat Enterprise Linux AS version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/rsh-0.17-17.6.src.rpm
9db33654428c9f2a68ae4fc3d3538b45 rsh-0.17-17.6.src.rpm

i386:
d3c9d0998a481654e6aa70bae6d81284 rsh-0.17-17.6.i386.rpm
458e22f5bbb542402ff7f1d5b31d8efc rsh-server-0.17-17.6.i386.rpm

ia64:
0ef714b4988d67746492c7fcc94c6505 rsh-0.17-17.6.ia64.rpm
c5ffc16936049d313396840c1340b190 rsh-server-0.17-17.6.ia64.rpm

ppc:
b95b84629007515d08ebdb9dbfc3ef2f rsh-0.17-17.6.ppc.rpm
fb95ecdabcdf4a94d3438d86c66fa10c rsh-server-0.17-17.6.ppc.rpm

s390:
3aeade4296a8fbef841988fa0931a627 rsh-0.17-17.6.s390.rpm
b974c6cfe31f0baa9863d543d4fbbc6c rsh-server-0.17-17.6.s390.rpm

s390x:
40007c9ed95ad284c2d6863bff54a69c rsh-0.17-17.6.s390x.rpm
63df1e561f4ccd2d0a088e3c419e1647 rsh-server-0.17-17.6.s390x.rpm

x86_64:
d5a8b840af161bf40970e8d51b5be791 rsh-0.17-17.6.x86_64.rpm
bc656e79fc3002249f5eb17d4993f67b rsh-server-0.17-17.6.x86_64.rpm

Red Hat Desktop version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/rsh-0.17-17.6.src.rpm
9db33654428c9f2a68ae4fc3d3538b45 rsh-0.17-17.6.src.rpm

i386:
d3c9d0998a481654e6aa70bae6d81284 rsh-0.17-17.6.i386.rpm
458e22f5bbb542402ff7f1d5b31d8efc rsh-server-0.17-17.6.i386.rpm

x86_64:
d5a8b840af161bf40970e8d51b5be791 rsh-0.17-17.6.x86_64.rpm
bc656e79fc3002249f5eb17d4993f67b rsh-server-0.17-17.6.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/rsh-0.17-17.6.src.rpm
9db33654428c9f2a68ae4fc3d3538b45 rsh-0.17-17.6.src.rpm

i386:
d3c9d0998a481654e6aa70bae6d81284 rsh-0.17-17.6.i386.rpm
458e22f5bbb542402ff7f1d5b31d8efc rsh-server-0.17-17.6.i386.rpm

ia64:
0ef714b4988d67746492c7fcc94c6505 rsh-0.17-17.6.ia64.rpm
c5ffc16936049d313396840c1340b190 rsh-server-0.17-17.6.ia64.rpm

x86_64:
d5a8b840af161bf40970e8d51b5be791 rsh-0.17-17.6.x86_64.rpm
bc656e79fc3002249f5eb17d4993f67b rsh-server-0.17-17.6.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/rsh-0.17-17.6.src.rpm
9db33654428c9f2a68ae4fc3d3538b45 rsh-0.17-17.6.src.rpm

i386:
d3c9d0998a481654e6aa70bae6d81284 rsh-0.17-17.6.i386.rpm
458e22f5bbb542402ff7f1d5b31d8efc rsh-server-0.17-17.6.i386.rpm

ia64:
0ef714b4988d67746492c7fcc94c6505 rsh-0.17-17.6.ia64.rpm
c5ffc16936049d313396840c1340b190 rsh-server-0.17-17.6.ia64.rpm

x86_64:
d5a8b840af161bf40970e8d51b5be791 rsh-0.17-17.6.x86_64.rpm
bc656e79fc3002249f5eb17d4993f67b rsh-server-0.17-17.6.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

6. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0175

7. Contact:

The Red Hat security contact is lt;secalert@redhat.comgt;. More contact details at https://www.redhat.com/security/team/contact/

Copyright 2005 Red Hat, Inc.


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