CVE-2017-11122 in tvOS
Summary
by MITRE
On Broadcom BCM4355C0 Wi-Fi chips 9.44.78.27.0.1.56, an attacker can trigger an information leak due to insufficient length validation, related to ICMPv6 router advertisement offloading.
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Analysis
by VulDB Data Team • 11/29/2019
The vulnerability identified as CVE-2017-11122 affects Broadcom BCM4355C0 Wi-Fi chips running firmware version 9.44.78.27.0.1.56 and represents a critical information disclosure flaw that can be exploited through ICMPv6 router advertisement offloading mechanisms. This vulnerability resides within the wireless networking stack of the affected chipsets and demonstrates a fundamental weakness in input validation processes that govern how network packets are processed and handled by the device's firmware. The issue specifically manifests when the chip processes ICMPv6 router advertisement messages, which are standard IPv6 network management protocols used for router discovery and configuration. The vulnerability stems from inadequate validation of packet lengths during the offloading process, where the chip's firmware fails to properly verify the boundaries of incoming ICMPv6 packets before processing them. This insufficient length validation creates a scenario where an attacker can manipulate packet structures to cause the firmware to read beyond allocated memory boundaries, resulting in the exposure of sensitive data from adjacent memory locations. The technical flaw aligns with CWE-129, which describes improper validation of length of input data, and represents a classic buffer over-read vulnerability that can lead to information leakage. From an operational perspective, this vulnerability poses significant risks to wireless network security as it allows remote attackers to potentially extract confidential information including network credentials, system configuration details, and potentially other sensitive data stored in memory regions adjacent to the processed ICMPv6 packets. The attack surface is particularly concerning because ICMPv6 router advertisements are commonly transmitted in wireless networks and can be easily spoofed or manipulated by adversaries within the network range. This vulnerability directly impacts the confidentiality aspect of the CIA triad and can enable further attacks by providing attackers with valuable information about the target network infrastructure and device configurations. The ATT&CK framework categorizes this vulnerability under T1046 Network Service Scanning and T1082 System Information Discovery, as it enables adversaries to gather network topology information and potentially extract sensitive system data. The impact extends beyond simple information disclosure as the leaked data could provide attackers with insights into network architecture, device firmware versions, and internal network configurations that could be leveraged for more sophisticated attacks. Mitigation strategies should focus on firmware updates provided by Broadcom to address the specific validation issues in the ICMPv6 processing logic, along with network segmentation and monitoring to detect anomalous ICMPv6 traffic patterns that might indicate exploitation attempts. Network administrators should also consider implementing firewall rules that limit ICMPv6 traffic or disable unnecessary router advertisement functionalities to reduce the attack surface. Additionally, regular security assessments of wireless network infrastructure should include verification of firmware versions and validation of input handling mechanisms to prevent similar vulnerabilities from persisting in the network ecosystem.