[BreachExchange] Vulnerability Affecting Routers From Many Vendors Exploited Days After Disclosure

[Sophia Kingsbury]

https://www.securityweek.com/vulnerability-affecting-routers-many-vendors-exploited-days-after-disclosure

On August 3, cybersecurity firm Tenable published a blog post describing a
vulnerability affecting routers that use firmware from Arcadyan, a
Taiwan-based provider of networking solutions.

Tenable’s researchers initially discovered a series of vulnerabilities
affecting routers made by Japan-based networking and storage device maker
Buffalo. A closer analysis revealed that one of the flaws, a path traversal
issue tracked as CVE-2021-20090, affects routers and modems from Arcadyan
and at least 19 other vendors that use firmware made by Arcadyan.

The vulnerability affecting multiple vendors can be exploited by an
unauthenticated attacker to bypass authentication and ultimately take
control of targeted devices by gaining root shell access.

The list of companies whose products are impacted by CVE-2021-20090
includes ADB, ASMAX, ASUS, Beeline, BT, Buffalo, Deutsche Telecom,
HughesNet, KPN, O2, Orange, Skinny, SparkNZ, Telecom Argentina, Telmex,
Telstra, Telus, Verizon and Vodafone.

A few days after Tenable disclosed technical details for CVE-2021-20090,
cybersecurity company Juniper Networks started seeing attempts to exploit
the vulnerability in the wild. An analysis of the attacks revealed links to
a botnet that was spotted by Juniper and Palo Alto Networks earlier this
year.

The botnet, powered by a variant of the notorious Mirai malware, targets a
wide range of vulnerabilities in an effort to ensnare IoT devices.
Mirai-powered botnets are typically used for launching distributed
denial-of-service (DDoS) attacks.

According to Juniper, from June 6 to July 23, the botnet operators added
exploits for D-Link, Cisco, Tenda, Micro Focus and other devices to their
arsenal.

Juniper has made available indicators of compromise (IOCs) for these
attacks.

Threat intelligence company Bad Packets last week reported seeing DDoS
botnet operators looking for devices affected by CVE-2021-20091, one of the
vulnerabilities discovered by Tenable that appears to be specific to
Buffalo routers.

The CERT Coordination Center at Carnegie Mellon University has also
published an advisory to warn users of the affected routers and modems.
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