{"id":4682,"date":"2026-09-04T18:46:41","date_gmt":"2026-09-04T10:46:41","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-66747"},"modified":"2026-09-04T18:46:41","modified_gmt":"2026-09-04T10:46:41","slug":"cve-2026-66747","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-66747","title":{"rendered":"CVE-2026-66747 [CRITICAL] &#8211; Zbtlink router firmware ships an embedded remote-control implant, ENDLESSDOORS, present in"},"content":{"rendered":"<p>Zbtlink router firmware ships an embedded remote-control implant, ENDLESSDOORS, present in every published build across the product line. It is the open-source ycsunjane\/rctl tool built in as an OpenWrt package (librctl.so), started at boot and run as root under the process name kworker to blend in with the kernel&#8217;s [kworker\/*] threads. It opens no listening port; it phones home over cleartext TCP to a hardcoded command-and-control server (command channel 7000, interactive-shell callback 7001) with no authentication and no transport encryption, re-attempting contact roughly every 35 seconds. Its command handler passes any received string to popen() as uid=0, and a reserved rctlbash command returns an interactive root shell. Because the channel is unauthenticated and cleartext, control is not limited to whoever planted it: any party that answers at the C2 address, occupies the network path (DNS or route hijack), or acquires the hardcoded fallback domain obtains unauthenticated remote code execution as root.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Zbtlink router firmware ships an embedded remote-control implant, ENDLESSDOORS, present in every published build across the product line. It is the open-source ycsunjane\/rctl tool built in as an OpenW<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-4682","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/4682","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4682"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4682"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}