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Researcher: National Emergency Alert System is Easy To Exploit_我的网站

A |     The Department of Homeland Security is telling state and local governments to update software and beef up security around devices connected to the nationwide Emergency Alert System (EAS). The recommendation comes days after security researcher Ken Pyle revealed vulnerabilities in devices used by officials to encode EAS alerts.,Pyle told KerbsOnSecurity that he first discovered the vulnerabilities in 2019 after buying old EAS equipment on eBay. He quickly found the vulnerabilities and alerted the FBI, DHS, and the manufacturer of the devices. Pyle decided to give the manufacturer and government time to address the issue before going public.,DHS Inspector General Overseeing Jan.6 Secret Service Probe Previously Misled Investigators: Report4 August, 12:27 GMT,He started to worry after the Jan 6, 2021 riot at the US Capitol, fearing that the vulnerabilities could be used “to start a civil war.”,That is because despite a patch being issued in 2019, many of the devices have not been updated either because they are too old for the new firmware or because of simple neglect by the operators. Pyle also says that many operators do not perform basic security measures recommended by the manufacturer, like changing the default password and putting the devices behind a firewall.,This is a problem because of the way EAS messages are distributed. There is no central authority and the process is automated in most cases. This means that someone could issue an alert locally and as long as it is accepted as a real EAS alert, it could spread nationwide.,“These devices are designed such that someone locally can issue an alert, but there’s no central control over whether I am the one person who can send or whatever,” Pyle told KerbsOnSecurity. “If you are a local operator, you can send out nationwide alerts. That’s how easy it is to do this.”,One device obtained by Pyle was a non-functional EAS device, purchased from an electronics recycling company. While the device no longer operated, the person who discarded it and the recycling company neglected to wipe the hard drive, giving Pyle access to cryptographic keys allowing him to broadcast messages on Comcast’s network, the third largest cable company in the US.,Comcast told KerbsOnSecurity in a statement that the EAS was lost by a third-party shipper and that the keys and credentials found on the device will no longer work on their system. They also thanked Pyle for his research and for informing them about the issue.,EAS vulnerabilities have been exploited in the past. In 2013, someone hacked the EAS networks in Great Falls, Montana, and Marquette, Michigan, using their access to issue an alert saying that zombies are rising from their graves. That same prank was repeated in Indiana in 2017. There have been other incidents, though they did not include zombies.。    IT之家 7 月 22 日消息，英伟达昨日（7 月 21 日）发布博文，从技术角度详细介绍了 Vera CPU，专为智能体 AI（Agentic AI）场景设计。

B |          英伟达表示智能体 AI 将更多的关键执行路径转移到了 CPU 上。智能体（Agents）在沙箱中运行代码、调用工具、检索上下文、与数据库交互以及分析结果，然后再将信息返回给模型。

C |          IT之家援引博文介绍，智能体 AI 工作负载主要取决于以下几点：          即使插槽完全负载，也需要强大的单线程性能。    每个核心都有足够的内存带宽，以持续为许多活跃的执行上下文提供数据。    并发下的延迟具有可预测性，以便智能体能够稳定完成预定步骤。    高效处理不规则控制流、长依赖链和指针密集型数据结构。         英伟达在博文中强调，Vera CPU 围绕智能体 AI 负载设计，重点提升满负载条件下的单线程表现，其设计核心是 Olympus 核心。         英伟达强调 Olympus 核心采用前端、核心中段、执行引擎和缓存子系统四部分设计。

D | 前端集成 10 宽解码引擎，并支持每周期最多处理 2 个已采用分支。其分支预测子系统包含神经分支预测器，用于提升复杂分支模式下的预测准确性。

E |          该公司表示，Vera CPU 共配备 88 个 Olympus 核心和 176 个 SMT 线程，目标是在单线程高负载与更高线程密度两类场景间切换，并降低线程间资源争用。         在片上互连与缓存部分，Vera CPU 搭载 NVIDIA 可扩展相干互连，即 NVIDIA Scalable Coherency Fabric（SCF）。         NVIDIA 称，这一互连提供最高 3.4 TB/s 双向分区带宽，并在全核心范围内集成 164 MB 统一 L3 缓存，连接核心、共享缓存、内存控制器、I/O 与 NVLink-C2C 接口。         内存方面，Vera CPU 采用 SOCAMM2 LPDDR5X 内存。NVIDIA 称，该子系统聚合带宽最高 1.2 TB/s，按单核计算最高 14 GB/s，面向高并发 AI、分析、图计算与强化学习负载供数。         扩展与 I/O 方面，NVIDIA 称 Vera CPU 支持双路扩展，通过第二代 NVLink-C2C 构建一致性双路平台。         双路配置下，平台提供 176 条 PCIe 6.4 通道，并支持 CXL 3.1。保密计算方面，Vera CPU 基于 Arm CCA / RME，支持按虚拟机分配加密密钥，并使用经认证的 C2C 加密保护一致性链路数据。

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