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Realtek SDK Vulnerability Exposes Routers From Many Distributors to Distant Assaults

By Eduard Kovacs on August 12, 2022

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A severe vulnerability affecting the eCos SDK made by Taiwanese semiconductor firm Realtek might expose the networking gadgets of many distributors to distant assaults.

The safety gap, tracked as CVE-2022-27255 and rated ‘excessive severity’, has been described as a stack-based buffer overflow that may permit a distant attacker to trigger a crash or obtain arbitrary code execution on gadgets that use the SDK. An assault could be carried out by the WAN interface utilizing specifically crafted SIP packets.

The Realtek eCos SDK is supplied to firms that manufacture routers, entry factors and repeaters powered by RTL819x household SoCs. The SDK implements the bottom functionalities of the router, together with the net administration interface and the networking stack. Distributors can construct on high of this SDK so as to add customized performance and their branding to the system.

Realtek knowledgeable clients in regards to the eCos SDK vulnerability in March, when it introduced the supply of a patch. Nevertheless, it’s as much as the OEMs utilizing the SDK to make sure that the patch is distributed to end-user gadgets.

Researchers at Argentina-based cybersecurity agency Faraday Safety have been credited by Realtek for locating the vulnerability. Faraday researcher Octavio Gianatiempo, who’s detailing the findings on Friday on the DEF CON convention in Las Vegas, shared some data with SecurityWeek forward of the occasion.

The researcher mentioned the vulnerability could be exploited remotely — immediately from the web — to hack affected routers operating with default settings. No person interplay is required for profitable exploitation.

“The susceptible code is a part of the networking stack — if the system is linked to the web, an attacker solely must ship a packet to take management of the system,” he defined.

Gianatiempo mentioned they’ve recognized roughly 20 distributors that use the susceptible SDK for his or her merchandise, together with Tenda, Nexxt, Intelbras, and D-Hyperlink. Nevertheless, there might be different impacted distributors that they’ve but to determine.

“The method of figuring out affected OEM merchandise is daunting because of the lack of visibility of their provide chain,” Gianatiempo famous.

Whereas there isn’t any indication that the flaw has been exploited within the wild, there might be a major variety of gadgets which are uncovered to assaults resulting from this vulnerability, so it could be tempting for malicious actors.

Faraday has carried out a Shodan search and recognized greater than 60,000 susceptible routers with their administration panel uncovered. As well as, Mercadolibre, the most important ecommerce web site in Latin America, has bought 130,000 gadgets affected by the vulnerability, in accordance with a gross sales counter displayed on product pages.

“The admin panel is just not enabled by default, so the full variety of uncovered gadgets ought to be better,” Gianatiempo defined. “Distant identification of affected routers would require triggering the vulnerability, which is outdoors our analysis scope.”

Risk actors have been identified to focus on Realtek SDK vulnerabilities of their assaults. Final 12 months, researchers noticed exploitation of a flaw simply days after its disclosure.

Associated: Gadgets From Many Distributors Can Be Hacked Remotely Attributable to Flaws in Realtek SDK

Associated: Vulnerabilities in Realtek Wi-Fi Module Expose Many Gadgets to Distant Assaults

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