{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/f453-router/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["F453 Router"],"_cs_severities":["critical"],"_cs_tags":["cve-2026-4552","tenda","buffer overflow","router"],"_cs_type":"advisory","_cs_vendors":["Tenda"],"content_html":"\u003cp\u003eCVE-2026-4552 is a critical vulnerability affecting Tenda F453 routers, specifically version 1.0.0.3. The vulnerability resides in the \u003ccode\u003efromVirtualSer\u003c/code\u003e function within the \u003ccode\u003e/goform/VirtualSer\u003c/code\u003e component of the router's firmware. A remote attacker can exploit this flaw by sending a specially crafted request to the router, manipulating the \u003ccode\u003epage\u003c/code\u003e argument. Due to the lack of proper input validation, the attacker can trigger a stack-based buffer overflow, potentially leading to arbitrary code execution on the device. This vulnerability is particularly concerning as the exploit is publicly disclosed, increasing the likelihood of widespread exploitation. Successful exploitation grants the attacker full control over the compromised router, potentially enabling them to intercept network traffic, modify router settings, or use the device as a pivot point for further attacks within the network.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a vulnerable Tenda F453 router running firmware version 1.0.0.3.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request targeting the \u003ccode\u003e/goform/VirtualSer\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe crafted request includes the \u003ccode\u003epage\u003c/code\u003e argument with a payload exceeding the buffer size allocated for it in the \u003ccode\u003efromVirtualSer\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe router processes the HTTP request without proper input validation, leading to a buffer overflow on the stack.\u003c/li\u003e\n\u003cli\u003eThe overflow overwrites critical data on the stack, including the return address.\u003c/li\u003e\n\u003cli\u003eWhen the \u003ccode\u003efromVirtualSer\u003c/code\u003e function returns, control is transferred to the attacker-controlled address.\u003c/li\u003e\n\u003cli\u003eThe attacker executes arbitrary code on the router, gaining control of the device.\u003c/li\u003e\n\u003cli\u003eThe attacker can then modify router settings, intercept network traffic, or use the compromised router as a foothold for further attacks.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-4552 allows a remote attacker to gain complete control over the Tenda F453 router. This can lead to a variety of malicious activities, including eavesdropping on network traffic, modifying DNS settings to redirect users to phishing sites, or using the router as a botnet node for distributed denial-of-service (DDoS) attacks. Given the widespread use of Tenda routers in home and small business networks, a large number of devices are potentially vulnerable. The potential damage includes data theft, financial loss, and disruption of network services.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eTenda_F453_Buffer_Overflow_Attempt\u003c/code\u003e to detect suspicious requests to the \u003ccode\u003e/goform/VirtualSer\u003c/code\u003e endpoint with unusually long \u003ccode\u003epage\u003c/code\u003e parameters.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for HTTP requests with a \u003ccode\u003ecs-uri-query\u003c/code\u003e containing \u003ccode\u003epage=\u003c/code\u003e followed by a long string of characters, as detected by the \u003ccode\u003eTenda_F453_Buffer_Overflow_Attempt\u003c/code\u003e rule.\u003c/li\u003e\n\u003cli\u003eIf possible, implement web application firewall (WAF) rules to block requests with overly long \u003ccode\u003epage\u003c/code\u003e parameters to prevent exploitation of CVE-2026-4552.\u003c/li\u003e\n\u003cli\u003eConsider network segmentation to limit the impact of a compromised router on other devices and systems on the network.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-24T12:00:00Z","date_published":"2024-01-24T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-tenda-f453-bo/","summary":"A stack-based buffer overflow vulnerability (CVE-2026-4552) exists in the Tenda F453 router version 1.0.0.3, allowing remote attackers to execute arbitrary code by manipulating the 'page' argument in the /goform/VirtualSer endpoint, due to insufficient input validation in the fromVirtualSer function.","title":"Tenda F453 Router Stack-Based Buffer Overflow Vulnerability","url":"https://feed.craftedsignal.io/briefs/2024-01-tenda-f453-bo/"}],"language":"en","title":"CraftedSignal Threat Feed - F453 Router","version":"https://jsonfeed.org/version/1.1"}