Multiple Security Vulnerabilities Found in UEFI TCP/IP Protocol Stack – PixieFail

In a recent development, a number of security vulnerabilities have been discovered in the TCP/IP network protocol stack of an open-source reference implementation of the UEFI (Unified Extensible Firmware Interface) specification. These flaws, collectively known as PixieFail, have the potential to cause significant harm, including remote code execution, denial of service (DoS) attacks, DNS cache poisoning, and data theft. This article will delve into the intricacies of these vulnerabilities, their impact, and the affected UEFI firmware vendors. Additionally, we will explore the specifics of the TianoCore EFI Development Kit II (EDK II) and the NetworkPkg TCP/IP stack, the role of the NetworkPkg in the Preboot eXecution Environment (PXE) stage, and the details of the individual vulnerabilities.

Overview of PixieFail Vulnerabilities

PixieFail encompasses multiple security vulnerabilities that compromise the integrity and security of the UEFI firmware. These vulnerabilities can be exploited at both the IPv4 and IPv6 layers. By leveraging overflow bugs, out-of-bounds reads, infinite loops, and a weak pseudorandom number generator (PRNG), attackers can execute remote code, initiate DoS attacks, conduct DNS cache poisoning, or extract sensitive information. The severity and exploitability of these vulnerabilities depend on the specific firmware build and the default PXE boot configuration.

Affected UEFI Firmware Vendors

The vulnerabilities discovered in the TCP/IP protocol stack impact UEFI firmware from several reputable vendors, including AMI, Intel, Insyde, and Phoenix Technologies. These vulnerabilities require immediate attention and action from these vendors to prevent their exploitation by malicious actors.

The TianoCore EFI Development Kit II (EDK II) and NetworkPkg play crucial roles in the functioning of UEFI firmware. Within the EDK II, the NetworkPkg TCP/IP stack aids in the management tasks during the initial Preboot eXecution Environment (PXE) stage. It is during this stage that vulnerabilities in the TCP/IP protocol stack exist.

Specific Vulnerabilities and Exploitation Possibilities

The PixieFail vulnerabilities include several distinct weaknesses, such as buffer overflow, integer underflow, and predictable TCP Initial Sequence Numbers. Each of these vulnerabilities poses risks that could lead to various forms of exploitation, including remote code execution, DoS attacks, DNS cache poisoning, and data theft. The exploitation possibilities exist at both the IPv4 and IPv6 layers, making it imperative for firmware vendors to address these vulnerabilities promptly.

The impact and exploitability factors of the PixieFail vulnerabilities vary depending on the specific firmware build and the default PXE boot configuration. Firmware builds that have implemented additional security measures and have strict boot configurations are less likely to be vulnerable. However, given the potential consequences of exploitation, it is crucial for all firmware vendors, regardless of their build and configuration, to take proactive measures in mitigating these vulnerabilities.

The discovery of the PixieFail vulnerabilities in the TCP/IP network protocol stack of the UEFI firmware highlights the importance of maintaining the security of firmware implementations. Firmware vendors, including AMI, Intel, Insyde, and Phoenix Technologies, must take immediate action to address these vulnerabilities and release patches or updates to protect their users from potential attacks. Additionally, it is advisable for system administrators and end-users to ensure that they regularly apply firmware updates and follow best security practices to minimize their exposure to these security risks. By addressing the vulnerabilities promptly and implementing necessary security measures, the UEFI firmware ecosystem can ensure the safety and integrity of their systems.

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