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CVE-2024-3721 is an OS command injection vulnerability affecting TBK DVR-4104 and DVR-4216 digital video recorders through version 20240412. Manipulation of the mdb and mdc arguments in the device's HTTP system-request handler allows remote, unauthenticated attackers to execute arbitrary operating-system commands. A public exploit is available, and the vulnerability has been exploited in botnet campaigns involving Mirai variants, including Nexcorium and Broadside.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single C source file ('tbk.c') implementing a network-based exploit targeting embedded devices (likely TBK DVRs or similar IoT devices) with an HTTP service exposing a '/device.rsp' endpoint. The exploit operates as a scanner, establishing up to 256 concurrent TCP connections to random IP addresses (with some filtering to avoid reserved/private ranges) on port 80. For each connection, it attempts to send a crafted HTTP POST request to the '/device.rsp' endpoint, injecting a shell command that downloads and executes a binary ('arm7') from a remote server (92.246.90.22). The exploit is operational, as it automates both the scanning and exploitation process, and the payload provides remote code execution on the target. The code is self-contained but references some external headers (not included), likely for utility and randomization functions. The main attack vector is network-based, and the exploit is designed for mass exploitation of vulnerable IoT devices.
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112 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting TBK DVR that ClingSTUN targets through a built-in self-propagation exploit. The article does not separately establish successful in-the-wild exploitation of this flaw.
A remote code execution vulnerability affecting TBK DVRs. Cling contains exploit logic for the vulnerability, but the content does not report confirmed exploitation of this specific flaw.
An additional vulnerability for which the analyzed Cling sample contains exploit code. The article does not individually identify its affected product or confirm successful exploitation in the wild.
Command injection vulnerability affecting TBK DVR devices, incorporated into ClingSTUN's self-propagation functionality.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.