Red Hat PXE (Preboot eXecution Environment) Server DHCP packet denial of service
| pxe-dhcp-dos (10003) |  Low Risk |
Description:
The PXE (Preboot eXecution Environment) package included with Red Hat Linux is vulnerable to a denial of service attack. A remote attacker could send malicious Dynamic Host Configuration Protocol (DHCP) packets to the PXE server from a Voice Over IP (VoIP) phone to cause the PXE server to crash.
Consequences:
Denial of Service
Remedy:
For Red Hat Linux:
Upgrade to the latest PXE package, as listed below. Refer to RHSA-2002:162-12 for more information. See References.
Red Hat 6.2: 0.1-31.100.6.2 or later
Red Hat 7.0, 7.1, 7.2, and 7.3: 0.1-31.99.7.3 or later
For Red Hat Advanced Server 2.1AS:
Upgrade to the latest PXE package (0.1-31.99.7.3 or later), as listed in RHSA-2002:165-06. See References.
For Caldera OpenLinux 3.1 and 3.1.1 (Server and Workstation):
Upgrade to the latest pxe packages (0.1-33 or later), as listed in SCO Security Advisory CSSA-2002-044.0. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
References:
- SCO Security Advisory CSSA-2002-044.0: Linux: Preboot eXecution Environment (PXE) server denial-of-service attacks.
- BID-5596: PXE Server DHCP Packet Denial Of Service Vulnerability
- CVE-2002-0835: Preboot eXecution Environment (PXE) server allows remote attackers to cause a denial of service (crash) via certain DHCP packets from Voice-Over-IP (VOIP) phones.
- RHSA-2002-162: PXE server crashes from certain DHCP packets
- RHSA-2002-165: pxe security update
Platforms Affected:
- RedHat Enterprise Linux 2.1 AS
- RedHat Linux 6.2
- RedHat Linux 7
- RedHat Linux 7.1
- RedHat Linux 7.2
- RedHat Linux 7.3
- RedHat PXE Server
- SCO Caldera OpenLinux Server 3.1
- SCO Caldera OpenLinux Server 3.1.1
- SCO Caldera OpenLinux Workstation 3.1
- SCO Caldera OpenLinux Workstation 3.1.1
Reported:
Aug 30, 2002
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