Updated at package available

This updated at package fixes two minor problems and one major
problem where the environment can get wiped out prior to the execution of a
scheduled command.

For versions of Red Hat Linux prior to 7.2, this package also fixes a
potential security vulnerability which can result in heap corruption (Red
Hat Linux 7.2 is not vulnerable to this security exploit).

Update 2002-02-01: The package for Red Hat Linux 6.2 tried to source a file
in /etc/init.d, which doesn't exist on a standard system.

A server running the latest version of at could have commands
that depend on the current environment (for example, the PATH) which would
then fail or run incorrectly because the environment would not be
accessible when the command was executed at a later time.

Additionally, in versions of Red Hat Linux prior to 7.2 a malicious local
user could specify an execution time is in a carefully drafted format
causing a heap corruption bug. Since the at command is installed as setuid
root this bug can be exploited.

The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0004 to this issue. Thanks to zen-parse for
reporting this vulnerability.

In addition to the fixed heap corruption, file handling security on all
versions of at has been improved by adding the O_EXCL (exclusive) option to
an open system call.

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.

49491 - all environment is wiped out prior to executing user command
51253 - Wrong pointer to time syntax in man page
52626 - "at" RPM says that /var/spool/at/.SEQ should be executable

https://www.redhat.com/security/data/cve/CVE-2002-0004.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0004

at, corruption, environment, heap, security