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Netfilter ("iptables") can leak information about how port forwarding is done in unfiltered ICMP packets. The older "ipchains" code is not affected. This bug only affects users using the Network Address Translation features of firewalls built with netfilter ("iptables"). Red Hat Linux's firewall configuration tools use "ipchains," and those configurations are not vulnerable to this bug.

Updated mod_python packages have been made available for Red Hat Linux 7.2 and 7.3. These updates close a security issue in mod_python which allows the publisher handler to use modules which have only been indirectly imported. This re-issue adds packages for Red Hat Linux 7.3.

The ifup-dhcp script which is part of the sysconfig package is responsible for setting up network-devices using configuration data obtained from a DHCP server by the dhcpcd DHCP client. It is possible for remote attackers to feed this script with evil data via spoofed DHCP replies for example. This way ifup-dhcp could be tricked into executing arbitrary commands as root. The ifup-dhcp shellscript has been fixed to not source the file containing the possible evil data anymore. Even though the sysconfig package is installed by default, this problem only affects systems with certain dhcp network-setups so only users using DHCP should update their sysconfig package.

The imlib library can be used by X11 applications to handle various kinds of image data.

RALEIGH, NC--May 6, 2002--Red Hat, Inc. (Nasdaq:RHAT) today released Red Hat Linux version 7.3, a highly configurable operating system (OS) designed for deployments ranging from games and personal productivity to file, print and web serving. Red Hat Linux 7.3 adds new productivity tools, personal firewall configuration at installation, and video conferencing software to deliver everything individual users, educational institutions and small businesses need for flexible Internet-based computing.

The Nautilus file manager in Red Hat Linux 7.2 has a symlink vulnerability.

Updated mod_python packages have been made available for Red Hat Linux 7.

DocBook is a document markup language that can be transformed into other formats using a stylesheet. The default stylesheet provided with Red Hat Linux has an insecure option enabled.

The sudo program allows local users to execute certain configured commands with root priviledges. Sudo contains a heap overflow in its prompt assembling function. The input used to create the password prompt is user controlled and not properly length-checked before copied to certain heap locations. This allows local attackers to overflow the heap of sudo, thus executing arbitrary commands as root. We would like to thank GlobalInterSec for finding and researching this vulnerability. As a temporary workaround you may remove the setuid bit from sudo by issuing the following command as root: "chmod -s /usr/bin/sudo".

The radius daemon as shipped with the radiusd-cistron package is responsible for the RADIUS authentication service in networks and therefore considered a security critical application. ZARAZA reported security releated bugs in various radius server and client software. The list of vulnerable servers includes the cistron radius package. Within the cistron package, a buffer overflow in the digest calculation function and miscalculations of attribute lengths have been fixed which could allow remote attackers to execute arbitrary commands on the system running the radius server. Beside the cistron radius package the following radius packages have been vulnerable to the same attacks and have been fixed: freeradius, radiusclient and livingston-radius. The only workaround for this bug is to disable the radius-server until the new packages have been installed.

fc found a buffer overflow in the variable expansion code used by sudo for its prompt. Since sudo is necessarily installed suid root a local user can use this to gain root access.

Previous versions of imlib, prior to 1.9.13, would fall back to the NetPBM library which is not suitable for loading untrusted images due to various problem in it's code. The new imlib also fixes some problems with arguments passed to malloc(). These problems could allow attackers to construct images that could cause crashes or, potentially, the execution of arbitrary code when said images are loaded by a viewer that uses imlib. Thanks to Alan Cox and Al Viro for discovering the problems.

A problem was discovered by fc, with further research by Global InterSec, in the sudo program with the password prompt parameter (-p). Sudo can be tricked into allocating less memory than it should for the prompt and in certain conditions it is possible to exploit this flaw to corrupt the heap in such a way that could be used to execute arbitary commands. Because sudo is generally suid root, this can lead to an elevation of privilege for local users.

Updated icecast packages are available which fix a number of security issues.

Updated sudo packages are available which fix a local root exploit.

Updated sudo packages are available which fix a local root exploit.

Updated sudo packages are available which fix a local root exploit.

New sudo packages are available to fix a security problem which may allow users to become root, or to execute arbitrary code as root.

Ethan Benson discovered a bug in rsync where the supplementary groups that the rsync daemon runs as (such as root) would not be removed from the server process after changing to the specified unprivileged uid and gid. This seems only serious if rsync is called using "rsync --daemon" from the command line where it will inherit the group of the user starting the server (usually root). Note that, by default, Mandrake Linux uses xinetd to handle connections to the rsync daemon. This was fixed upstream in version 2.5.3, as well as the previously noted zlib fixes (see MDKSA-2002:023). The authors released 2.5.4 with some additional zlib fixes, and all users are encouraged to upgrade to this new version of rsync. Update: Mandrake Linux 8.1/ia64 packages are now available.

An internal audit by the xpilot (a multi-player tactical manoeuvring game for X) maintainers revealed a buffer overflow in xpilot server. This overflow can be abused by remote attackers to gain access to the server under which the xpilot server is running.