{"id":99604,"date":"2021-03-29T10:22:51","date_gmt":"2021-03-29T08:22:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah"},"modified":"2021-03-29T10:22:51","modified_gmt":"2021-03-29T08:22:51","slug":"uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah","title":{"rendered":"Vulnerability in the NPM package node-netmask, used in 270,000 projects","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A vulnerability has been identified in the NPM package node-netmask, which has around 3 million downloads per week and is used as a dependency in over 270,000 projects on GitHub (CVE-2021-28918), allowing bypassing checks where the network mask is used to determine membership in address ranges or for filtering. The issue has been resolved in the node-netmask 2.0.0 release. <\/p>\n

The vulnerability allows external IP addresses to be treated as if they are from the internal network and vice versa. With a certain logic in using the node-netmask module in the application, SSRF (Server-side Request Forgery), RFI (Remote File Inclusion), and LFI (Local File Inclusion) attacks can be carried out to access resources within the internal network and include external or local files in the execution chain. The issue lies in the fact that, according to the specification, string values of addresses starting with zero should be interpreted as octal numbers, but the 'node-netmask' module does not take this feature into account and processes them as decimal numbers. <\/p>\n

For example, an attacker can request a local resource by specifying the value '0177.0.0.1', which corresponds to '127.0.0.1'. However, the 'node-netmask' module will discard the zero and process '0177.0.0.1' as '177.0.0.1', which in the application will not allow determining its identity with '127.0.0.1' when evaluating access rules. Similarly, the attacker can specify the address '0127.0.0.1', which should be identical to '87.0.0.1', but in the 'node-netmask' module, it will be processed as '127.0.0.1'. One can also deceive checks for intranet addresses by providing values like '012.0.0.1' (equivalent to '10.0.0.1', but when checked will be processed as '12.0.0.1'). <\/p>\n

Researchers who discovered the issue describe it as catastrophic and provide several attack scenarios, though most of them seem theoretical. For example, it is mentioned that there is a possibility to attack applications based on Node.js that establish external connections to request resources based on parameters or incoming request data, but no specific application is named or detailed. Even if applications performing resource loading based on input are found. (the key to connect to is specified, and iroh finds the associated host and establishes an encrypted connection using the QUIC protocol). Direct P2P connections are established whenever possible, but if not, it falls back to using relays, which are also employed for host discovery by keys. You can run your own relay or connect to public relays supported by the community.<\/a>, it is not entirely clear how the vulnerability can be practically applied without connecting to a local network or gaining control over 'mirror' IP addresses. <\/p>\n

Researchers only speculate that the owners of 87.0.0.1 (Telecom Italia) and 0177.0.0.1 (Brasil Telecom) may have the ability to bypass access restrictions to 127.0.0.1. A more realistic scenario would be to use the vulnerability to bypass various blocking lists implemented on the application side. The issue could also be applied to altering the definition of intranet ranges in the NPM module 'private-ip'.
\n
Source: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 NPM-\u043f\u0430\u043a\u0435\u0442\u0435 node-netmask, \u043d\u0430\u0441\u0447\u0438\u0442\u044b\u0432\u0430\u044e\u0449\u0435\u043c \u043e\u043a\u043e\u043b\u043e 3 \u043c\u043b\u043d \u0437\u0430\u0433\u0440\u0443\u0437\u043e\u043a \u0432 \u043d\u0435\u0434\u0435\u043b\u044e \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u043c \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u0443 \u0431\u043e\u043b\u0435\u0435 270 \u0442\u044b\u0441\u044f\u0447 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432 \u043d\u0430 GitHub, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-28918), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u0430\u044f \u043c\u0430\u0441\u043a\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0432\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0432 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d\u044b \u0430\u0434\u0440\u0435\u0441\u043e\u0432 \u0438\u043b\u0438 \u0434\u043b\u044f \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 node-netmask 2.0.0. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e IP-\u0430\u0434\u0440\u0435\u0441\u0430 \u043a\u0430\u043a […]<\/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-99604","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 the NPM package node-netmask, used in 270,000 projects | ProHoster","description":"In the NPM package node-netmask, which has around 3 million downloads per week and is used as a dependency in over 270,000 projects on GitHub, a vulnerability (CVE-2021-28918) has been discovered, allowing bypassing of 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