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Redigo: New Backdoor Focusing on Redis Servers

By Ionut Arghire on December 05, 2022

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Researchers at cloud safety firm Aqua Safety are elevating alarm on a newly recognized backdoor focusing on Redis servers.

Dubbed Redigo, the malware is written in Go and was seen being deployed in an assault that exploited a recognized Redis vulnerability (CVE-2022-0543, CVSS rating of 10) for preliminary entry.

Resulting in distant code execution (RCE), the bug made headlines in April, when safety researchers recognized greater than 2,000 internet-exposed servers that have been probably impacted. Patches have been launched in February.

The vulnerability impacts Redis due to its use of the Lua scripting engine, to allow customers to load and execute Lua scripts straight on the server.

“In some Debian packages the Lua library offered a dynamic library. When the Redis server masses the Lua library, it masses a bundle variable. The bundle is left within the Lua sandbox and used to name any Lua library,” which results in a Lua sandbox escape, Aqua explains.

Attackers scanning for internet-exposed Redis servers can execute a sequence of instructions permitting them to establish cases susceptible to CVE-2022-0543, after which exploit the safety bug to run attacker-controlled code.

As a part of the noticed assaults, menace actors have been dropping and executing the Redigo backdoor, which hid its communication with the command-and-control (C&C) server to cover its presence on the machine.

Aqua has but to find out the aim of the Redigo assaults, however believes distributed denial-of-service (DDoS), cryptomining, information theft, and protracted entry to compromised environments are the principle candidates.

As a result of a number of the backdoor’s features are particular to Redis, the researchers consider that the attackers constructed and adjusted the menace to Redis servers. The malware is at the moment undetected by the antimalware engines in VirusTotal.

“These adversaries have been utilizing seemingly innocuous communication with the Redis protocol whereas constructing a botnet community after which transformed our Redis server right into a slave to execute the grasp’s instructions. The assault was profitable because of the vulnerability these adversaries exploited in our server,” Aqua notes.

Redis server house owners are suggested to use patches as quickly as attainable and monitor their environments for any suspicious exercise.

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