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Security Advisory Updated utempter package fixes vulnerability

Advisory: RHSA-2004:175-05
Type: Security Advisory
Severity: N/A
Issued on: 2004-04-30
Last updated on: 2004-04-30
Affected Products: Red Hat Linux 9
CVEs (cve.mitre.org): CVE-2004-0233

Details

An updated utempter package that fixes a potential symlink vulnerability is
now available.

Utempter is a utility that allows terminal applications such as xterm and
screen to update utmp and wtmp without requiring root privileges.

Steve Grubb discovered a flaw in Utempter which allowed device names
containing directory traversal sequences such as '/../'. In combination
with an application that trusts the utmp or wtmp files, this could allow a
local attacker the ability to overwrite privileged files using a symlink.

Users should upgrade to this new version of utempter, which fixes this
vulnerability.


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

Updated packages

Red Hat Linux 9

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/utempter/0.5.5-2.RHL9.0/SRPMS/utempter-0.5.5-2.RHL9.0.src.rpm
Missing file
    MD5: b7f13df830c3f64eef6c6895edfb3b1f
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/utempter/0.5.5-2.RHL9.0/i386/utempter-0.5.5-2.RHL9.0.i386.rpm
Missing file
    MD5: b207cd5661c7d687c3503399ce3bb611
 

References



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

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/