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Botnets Target Zero-Days in GPON Routers

Two unpatched vulnerabilities in Dasan’s Gigabit-capable Passive Optical Network (GPON) routers are being exploited by Internet of Things (IoT) botnets, security researchers warn.

Tracked as CVE-2018-10561 and CVE-2018-10562, the two vulnerabilities were publicly disclosed in early May and impact hundreds of thousands of devices. The flaws can be exploited remotely, providing an attacker with full control of the impacted devices.

South Korea-based Dasan Networks hasn’t released a fix for these issues as of now, yet the first attempts to exploit the bugs were registered within days after the disclosure. An unofficial patch for the bugs was made available a couple of weeks back.

Last week, Fortinet alerted on Wicked, a new variant of Mirai that has added exploits for the GPON vulnerabilities to its arsenal. The security firm also revealed that a botnet iteration called Omni was being dropped onto the compromised devices.

According to researchers from Qihoo 360 Netlab, there were five botnets targeting the two GPON vulnerabilities last week, namely Hajime, Mettle, Mirai, Muhstik, and Satori.

Now, the security researchers reveal that an older botnet called TheMoon has joined the GPON party as well. Active since at least 2014, the botnet has merged at least 6 different IoT exploits last year, and appears to continue to evolve.

“A very special thing about this round is the attacking payload. It is different from all previous ones, so it looks like a 0day. And we tested this payload on two different versions of GPON home router, all work. All these make TheMoon totally different, and we chose not to disclose the attack payload details,” Netlab notes.

Trend Micro also reports Mirai-like scanning activity in Mexico, with GPON routers being the target. This is unsurprising, given that most of the Internet-exposed Dasan routers affected by the two flaws are located in Mexico, Kazakhstan, and Vietnam.

“Unlike the previous activity, the targets for this new scanning procedure are distributed. However, based on the username and password combinations we found in our data, we concluded that the target devices still consist of home routers or IP cameras that use default passwords,” Trend Micro notes.

However, the attacks also attempt to compromise the targeted devices using vulnerabilities, the security firm notes. A downloading script is used to fetch malware variants for four different architectures, namely ARM, ARMv7, MIPS and MIPS little-endian, common architectures in embedded and IoT devices.

Related: "Wicked" Variant of Mirai Botnet Emerges

Related: Unofficial Patch Released for Zero-Days Affecting Dasan Routers

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