RHBA-2014:1574 - Bug Fix Advisory

Topic

An updated gpxe package that fixes two bugs is now available for Red Hat
Enterprise Linux 6.

Description

The gpxe package provides gPXE, an open source Pre-boot Execution Environment
(PXE) implementation and boot loader.

This update fixes the following bugs:

• The PXE booting did not respect the specified boot order when multiple NICs of

the same type were configured for a virtual machine. Instead, the gPXE image
attempted to boot from all NICs supported by the loaded image in the PCI bus
scan order. This resulted in boot delays, attempting to perform a PXE boot on
unintended devices, as well as in booting from unintended devices in case of
success. This update provides the gPXE boot image with the PCI address of the
intended boot device, ensuring that the image only attempts to boot on the
intended device. (BZ#1057249)

• HTTP requests generated by gPXE set wrong TCP flag (SYN & PSH) in the first

packet of a session. Consequently, when using a firewall, the TCP packet flow
would be blocked and the HTTP module integrated with gPXE would not work. With
this update, gPXE no longer set the PSH flag in the first packet of a session
and the system now boots as expected. (BZ#1105189)

Users of gpxe are advised to upgrade to this updated package, which fixes these
bugs.

Solution

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64

Fixes

• BZ - 1105189 - HTTP request generated by gPXE has wrong TCP flag (SYN & PSH) in first packet in session

CVEs

(none)

References

(none)