{"id":150639,"date":"2024-03-23T08:34:21","date_gmt":"2024-03-23T08:34:21","guid":{"rendered":"https:\/\/cn.cryptonews.com\/?p=150639"},"modified":"2024-03-23T08:33:43","modified_gmt":"2024-03-23T08:33:43","slug":"ping-guom-xi-jing-pian-bao-an-quan-lou-dong-wu-fa-tou-guo-bu-ding-xiu-bu-shi-yong-qian-bao-shi-mi-yao-huo-bei-dao","status":"publish","type":"post","link":"https:\/\/cryptonews.com\/cn\/news\/ping-guom-xi-jing-pian-bao-an-quan-lou-dong-wu-fa-tou-guo-bu-ding-xiu-bu-shi-yong-qian-bao-shi-mi-yao-huo-bei-dao\/","title":{"rendered":"\u82f9\u679cM\u7cfb\u6676\u7247\u7206\u5b89\u5168\u6f0f\u6d1e \u65e0\u6cd5\u900f\u8fc7\u8865\u4e01\u4fee\u8865 \u4f7f\u7528\u94b1\u5305\u65f6\u5bc6\u94a5\u6216\u88ab\u76d7"},"content":{"rendered":"

\"\"<\/p>

学术研究人员在3月21日发表的一篇论文<\/a>中透露，他们新发现的一个漏洞存在于苹果M系列芯片中，允许攻击者在Mac执行广泛使用的加密操作时，提取密钥。\n<\/p>

无法透过补丁修补<\/h2>

<\/span><\/p>

\n这个缺陷是一个名为侧信道（GoFetch）的问题，当苹果芯片运行广泛使用的加密协议的实现时，允许端到端的密钥提取，而且这个问题不能直接修补，因为它源芯片微架构设计本身。相反，只能通过在第三方加密软件中构建防御来缓解，这可能会在执行加密操作时，特别是在早期的M1和M2代芯片上，大幅降低M系列的性能。当目标的加密操作和具有普通用户系统权限的恶意应用在同一个CPU集群上运行时，这个漏洞就可以被利用。\n<\/p>

侧信道原意为优化处理速度<\/h2>

<\/span><\/p>

\n这个威胁存在于芯片的数据内存依赖预取器中，这是一种硬件优化，它预测正在运行的代码在不久的将来可能访问的内存地址。通过在实际需要之前就将内容加载到CPU缓存中，DMP（如该功能所缩写）减少了主内存和CPU之间的延迟，这是现代计算中的一个常见瓶颈。DMP是仅在M系列芯片和英特尔第13代Raptor Lake微架构中发现的相对新现象，尽管较老的预取器形式已经存在多年。<\/p>

安全专家早就知道，传统的预取器开启了一个侧信道，恶意进程可以通过探测此信道来获取加密操作中的密钥材料。这个漏洞是因为预取器根据之前的访问模式做出预测，这可能会造成状态的变化，攻击者可以利用这种变化泄露信息。作为回应，加密工程师设计了恒定时间编程，这是一种确保所有操作完成所需时间相同的方法，不论它们的操作数如何。它通过保持代码不涉及依赖密钥的内存访问或结构来实现这一点。<\/p>

这项新研究的突破在于，它揭示了苹果硅芯片中DMPs先前被忽视的行为：有时它们会将内存内容，如密钥材料，与用于加载其他数据的指针值混淆。结果，DMP经常读取数据并试图将其作为地址来进行内存访问。这种“指针解引用”意味着通过侧信道读取数据并泄露它，是对恒定时间范式的公然违背。<\/p>","protected":false},"excerpt":{"rendered":"

学术研究人员在3月21日发表的一篇论文中透露，他们新发现的一个漏洞存在于苹果M系列芯片中，允许攻击者在Mac执行广泛使用的加密操作时，提取密钥。 无法透过补丁修补 这个缺陷是一个名为侧信道（GoFetch）的问题，当苹果芯片运行广泛使用的加密协议的实现时，允许端到端的密钥提取，而且这个问题不能直接修补，因为它源芯片微架构设计本身。相反，只能通过在第三方加密软件中构建防御来缓解，这可能会在执行加密操作时，特别是在早期的M1和M2代芯片上，大幅降低M系列的性能。当目标的加密操作和具有普通用户系统权限的恶意应用在同一个CPU集群上运行时，这个漏洞就可以被利用。 侧信道原意为优化处理速度 这个威胁存在于芯片的数据内存依赖预取器中，这是一种硬件优化，它预测正在运行的代码在不久的将来可能访问的内存地址。通过在实际需要之前就将内容加载到CPU缓存中，DMP（如该功能所缩写）减少了主内存和CPU之间的延迟，这是现代计算中的一个常见瓶颈。DMP是仅在M系列芯片和英特尔第13代Raptor Lake微架构中发现的相对新现象，尽管较老的预取器形式已经存在多年。安全专家早就知道，传统的预取器开启了一个侧信道，恶意进程可以通过探测此信道来获取加密操作中的密钥材料。这个漏洞是因为预取器根据之前的访问模式做出预测，这可能会造成状态的变化，攻击者可以利用这种变化泄露信息。作为回应，加密工程师设计了恒定时间编程，这是一种确保所有操作完成所需时间相同的方法，不论它们的操作数如何。它通过保持代码不涉及依赖密钥的内存访问或结构来实现这一点。这项新研究的突破在于，它揭示了苹果硅芯片中DMPs先前被忽视的行为：有时它们会将内存内容，如密钥材料，与用于加载其他数据的指针值混淆。结果，DMP经常读取数据并试图将其作为地址来进行内存访问。这种“指针解引用”意味着通过侧信道读取数据并泄露它，是对恒定时间范式的公然违背。<\/p>\n","protected":false},"author":308,"featured_media":150640,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,1],"tags":[],"editors":[1080],"sponsored_companies":[],"class_list":["post-150639","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blockchain-news","category-news","editors-allen-li"],"acf":[],"yoast_head":"\n\u82f9\u679cM\u7cfb\u6676\u7247\u7206\u5b89\u5168\u6f0f\u6d1e \u65e0\u6cd5\u900f\u8fc7\u8865\u4e01\u4fee\u8865 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