{"id":32375,"date":"2019-10-31T21:46:40","date_gmt":"2019-10-31T18:46:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-chipah-qualcomm-pozvolyayushhaya-izvlech-zakrytye-klyuchi-iz-hranilishha-trustzone\/"},"modified":"2019-10-31T21:46:40","modified_gmt":"2019-10-31T18:46:40","slug":"uyazvimost-v-chipah-qualcomm-pozvolyayushhaya-izvlech-zakrytye-klyuchi-iz-hranilishha-trustzone","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/uyazvimost-v-chipah-qualcomm-pozvolyayushhaya-izvlech-zakrytye-klyuchi-iz-hranilishha-trustzone","title":{"rendered":"Vulnerability in Qualcomm chips allowing the extraction of private keys from the TrustZone storage.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Researchers from NCC Group revealed<\/a><\/noindex> details<\/noindex> vulnerabilities (CVE-2018-11976<\/a><\/noindex>) in Qualcomm chips, allowing the determination of the contents of closed encryption keys stored in the isolated Qualcomm QSEE (Qualcomm Secure Execution Environment) enclave, based on ARM TrustZone technology. The issue manifests in in the majority of<\/a><\/noindex> the Snapdragon SoC, which is widely used in smartphones running the Android platform. Fixes addressing the problem are already includes<\/a><\/noindex> In the April update of Android and in new firmware releases for Qualcomm chips. Qualcomm took over a year to prepare the fix \u2014 initially, information about the vulnerability was sent to Qualcomm on March 19, 2018.<\/p>\n

It is worth noting that ARM TrustZone technology allows for the creation of hardware-isolated secure environments that are completely separate from the main system and are executed on a separate virtual processor using a separate specialized operating system. The primary purpose of TrustZone is to ensure the isolated execution of encryption key handlers, biometric authentication, payment data, and other confidential information. Interaction with the main OS occurs indirectly through a dispatch interface. Closed encryption keys are placed within a hardware-isolated key storage, which, when properly implemented, helps prevent their leakage in case of a compromise of the main system.<\/p>\n

The vulnerability is associated with a flaw in the implementation of the elliptic curve processing algorithm, which led to the leakage of information about the data processing progress. Researchers developed a side-channel attack technique that allows the recovery of closed keys stored in an isolated Android Keystore<\/a><\/noindex>. The leaks are determined based on the analysis of branch prediction activity and changes in data access times in memory. In an experiment, researchers successfully demonstrated the recovery of 224-bit and 256-bit ECDSA keys from the hardware-isolated key store used in the Nexus 5X smartphone. To recover the key, approximately 12,000 digital signatures were generated, taking over 14 hours. The attack utilized the toolkit Cachegrab<\/a><\/noindex>.<\/p>\n

The main reason for the problem is the shared use of common hardware components and cache for calculations in TrustZone and the main system \u2014 isolation is performed at the logical partition level, but using shared computational blocks and retaining traces of calculations and transition address information in the shared processor cache. With the Prime+Probe method, based on assessing the change in access time to cached information, it is possible to track data flows and signs of code execution related to digital signature calculations in TrustZone with quite high accuracy by checking for the presence of certain patterns in the cache. <\/p>\n

Most of the time spent generating a digital signature using ECDSA keys in Qualcomm chips is taken up by performing multiplication operations in a loop with a constant initialization vector for each signature (nonce<\/a><\/noindex>). If an attacker can recover even a few bits of information about this vector, it becomes possible to carry out an attack by sequentially recovering the entire private key. <\/p>\n

In the case of Qualcomm, two leakage points of such information were identified in the multiplication algorithm: during table lookup operations and in the conditional data extraction code based on the value of the last bit in the 'nonce' vector. Despite the measures in Qualcomm's code to prevent information leaks through side channels, the developed attack method allows bypassing these measures and determining several bits of the 'nonce' value, which are sufficient to recover 256-bit ECDSA keys.<\/p>\n

<\/a><\/noindex><\/p>\n

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

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 NCC Group \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0434\u0435\u0442\u0430\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2018-11976) \u0432 \u0447\u0438\u043f\u0430\u0445 Qualcomm, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0445 \u043a\u043b\u044e\u0447\u0435\u0439 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u044f, \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d\u043d\u044b\u0445 \u0432 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u0430\u043d\u043a\u043b\u0430\u0432\u0435 Qualcomm QSEE (Qualcomm Secure Execution Environment), \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043d\u0430 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 ARM TrustZone. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0435 SoC Snapdragon, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0445 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432 \u0441\u043c\u0430\u0440\u0442\u0444\u043e\u043d\u0430\u0445 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b Android. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f, \u0443\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443, \u0443\u0436\u0435 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u044b \u0432 \u0430\u043f\u0440\u0435\u043b\u044c\u0441\u043a\u043e\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-32375","post","type-post","status-publish","format-standard","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\udd47Vulnerability in Qualcomm chips allowing the extraction of private keys from the TrustZone storage | ProHoster","description":"Researchers from NCC Group have disclosed the details of the 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