{"id":38012,"date":"2019-10-31T22:21:11","date_gmt":"2019-10-31T19:21:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh\/"},"modified":"2019-10-31T22:21:11","modified_gmt":"2019-10-31T19:21:11","slug":"realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/realizatsiya-ddio-v-chipah-intel-dopuskaet-setevuyu-ataku-po-opredeleniyu-nazhatij-klavish-v-seanse-ssh","title":{"rendered":"The implementation of DDIO in Intel chips allows for a network attack specifically targeting keystrokes in an SSH session.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A group of researchers from the Free University of Amsterdam and ETH Zurich has developed a network attack technique NetCAT<\/a><\/noindex> (Network Cache ATtack) that allows, by applying data analysis methods through external channels, to remotely determine the keys pressed by the user during an SSH session. The issue only occurs on servers that use the RDMA<\/a><\/noindex> (Remote Direct Memory Access) and DDIO<\/a><\/noindex> (Data-Direct I\/O).<\/p>\n

Intel Corporation believes<\/a><\/noindex>, making the attack difficult to execute in practice, as it requires the attacker to access the local network, sterile conditions, and organization of host communication using RDMA and DDIO technologies, which are typically used in isolated networks, such as those operating computing clusters. The problem has been assigned a low severity level (CVSS 2.6, CVE-2019-11184<\/a><\/noindex>) and it is recommended not to include DDIO and RDMA in local networks where no security perimeter is provided and untrusted clients are allowed to connect. DDIO has been used in Intel server processors since 2012 (Intel Xeon E5, E7, and SP). Systems based on AMD processors and those from other manufacturers are not affected by the issue, as they do not support the caching of transmitted network data in CPU cache.<\/p>\n

The method used for the attack resembles the vulnerability \u201cThrowhammer<\/a><\/noindex>,\u201d which allows modifying individual bits in RAM through manipulation of network packets in RDMA systems. This new issue is a consequence of efforts to minimize latencies when using the DDIO mechanism, which enables direct interaction between the network card and other peripheral devices with the processor cache (during network packet processing, data is saved to the cache and retrieved from the cache without accessing memory).<\/p>\n

Thanks to DDIO, data generated during malicious network activity also enters the CPU cache. The NetCAT attack is based on the fact that network cards actively cache data, and the speed of packet processing in modern local networks is sufficient to influence cache filling and determine the presence or absence of data in the cache through delay analysis during data transmission. <\/p>\n

When using interactive sessions, such as through SSH, the network packet is sent immediately after a key is pressed, meaning the delays between packets correlate with the delays between key presses. By employing statistical analysis methods and considering that the delays between key presses typically depend on the key's position on the keyboard, it's possible to recreate the entered information with a certain probability. For instance, most people tend to type \u201cs\u201d after \u201ca\u201d significantly faster than \u201cg\u201d after \u201cs.\u201d<\/p>\n

Information residing in the processor cache allows for precise timing of packets sent by the network card when processing connections such as SSH. By generating a specific stream of traffic, an attacker can determine when new data appears in the cache related to particular activities in the system. The method used for cache content analysis is Prime+Probe<\/a><\/noindex>, which involves filling the cache with a reference set of values and measuring the access time to them during re-filling to identify changes. <\/p>\n

\"The<\/a><\/noindex><\/center><\/p>\n

The proposed technique can also be used to determine not only key presses but other types of sensitive data that reside in the CPU cache. Potentially, an attack could be conducted even with RDMA disabled, but the effectiveness decreases without RDMA, and execution becomes substantially more complicated. Additionally, DDIO can be used to establish a covert communication channel for transferring data after compromising the server, circumventing security measures.<\/p>\n

\r\n \"Play\r\n
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<\/a><\/noindex><\/p>\n

Source: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 RDMA (Remote direct memory access) \u0438 DDIO […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":28530,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-38012","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47 The implementation of DDIO in Intel chips allows for a network attack to determine key presses during an SSH session | ProHoster","description":"A group of researchers from the Free University of Amsterdam and ETH Zurich has developed a network attack 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