New Ttint IoT botnet exploits two zero
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2020-10987 | Unauthenticated OS Command Injection in Tenda AC15 AC1900 Router CVE-2020-10987 is an unauthenticated OS command injection flaw (CWE-78) in the goform/setUsbUnload endpoint of the Tenda AC15 AC1900 router, demonstrated on firmware version 15.03.05.19. An attacker triggers it by sending a crafted deviceName POST parameter to that endpoint, which is not properly sanitized before being used in a system command. Successful exploitation yields arbitrary remote code execution on the router, giving the attacker full control of the device and a foothold to pivot into the local network, as is typical for IoT botnet recruitment. Owners of Tenda AC15 routers are affected, with greatest risk on units whose web administration interface is reachable from the internet. Exploitation is confirmed in the wild: the flaw is in CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03), carries a 79.8% EPSS score (top percentile), and a public proof of concept has been available since its 2020 disclosure; ransomware use is unknown. Do: Apply the latest Tenda AC15 firmware available from the vendor (newer than 15.03.05.19) per CISA's required action and vendor instructions. Until patched, disable or restrict WAN-side remote web administration to trusted source IPs, since the flaw is exploitable without credentials over the network. Check router HTTP logs for unexpected POST requests to /goform/setUsbUnload containing suspicious deviceName values, and monitor for botnet-style command activity. | 9.8 | 80% | KEV PoC |
| moderateLikely on the order of thousands to tens of thousands of remotely exploitable Tenda AC15 units (estimate; no authoritative install-base or scan count provided). |
Full article334 words · extracted from securityaffairs.com · click to collapse
Security researchers provided technical details about an IoT botnet dubbed Ttint that has been exploiting two zero-days in Tenda routers
Security researchers at Netlab, the network security division Qihoo 360, have published a report that details an IoT botnet dubbed Ttint.
The experts are monitoring the Mirai-based botnet since November 2019 and observed it exploiting two Tenda router 0-day vulnerabilities to spread a Remote Access Trojan (RAT).
Unlike other IoT DDoS botnets, Ttint implements 12 remote access functions such as Socket5 proxy for router devices, tampering with router firewall and DNS settings, executing remote custom system commands.
The botnet uses the WSS (WebSocket over TLS) protocol for C2 communication to circumvent the typical Mirai traffic detection and provide secure encrypted communication for command and control.
“About the infrastructure, the attacker first used a Google cloud service IP, and then switched to a hosting provider in Hong Kong” reads the analysis published by Netlab.
“Two zero days, 12 remote access functions for the router, encrypted traffic protocol, and infrastructure IP that that moves around. This botnet does not seem to be a very typical player.”
When the botnet was first detected in 2019, experts noticed it was exploiting the Tenda zero-day flaw tracked as CVE-2020-10987.
The vulnerability was detailed in July 2020 by the security researchers Sanjana Sarda.
On August 21, Netlab researchers observed the Ttint botnet exploiting a second zero-day flaw in the family of Tenda routers.
On August 28, 2020, Netlab reported the details of this second 0-day flaw and the PoC to Tenda, but the vendor has not yet responded.
According to the experts, Tenda routers running a firmware version between AC9 to AC18 are vulnerable to the attack.
The report published by Netlab includes Indicators of Compromise (IoCs).
“We recommend that Tenda router users check their firmware and make necessary update.” concludes the report. “We also recommend that our readers monitor and block related IoCs.”
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(SecurityAffairs – hacking, Ttint botnet)
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