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 * Linux Nimbuspwn flaws could allow attackers to deploy sophisticated threats



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LINUX NIMBUSPWN FLAWS COULD ALLOW ATTACKERS TO DEPLOY SOPHISTICATED THREATS

April 27, 2022  By Pierluigi Paganini


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MICROSOFT DISCLOSED TWO LINUX PRIVILEGE ESCALATION FLAWS, COLLECTIVELY NAMED
NIMBUSPWN, THAT COULD ALLOW CONDUCTING VARIOUS MALICIOUS ACTIVITIES.

The Microsoft 365 Defender Research Team has discovered two Linux privilege
escalation flaws (tracked as CVE-2022-29799 and CVE-2022-29800) called
“Nimbuspwn,” which can be exploited by attackers to conduct various malicious
activities, including the deployment of malware.

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“The vulnerabilities can be chained together to gain root privileges on Linux
systems, allowing attackers to deploy payloads, like a root backdoor, and
perform other malicious actions via arbitrary root code execution.” reads the
advisory published by Microsoft.

The flaws can be exploited by attackers to achieve root access to the target
systems and deploy by more sophisticated threats, such as ransomware.

The flaws reside in the systemd component called networked-dispatcher, which is
dispatcher daemon for systemd-networkd connection status changes.

The review of the code flow for networkd-dispatcher revealed multiple security
issues, including directory traversal, symlink race, and
time-of-check-time-of-use race condition issues.

The researchers started enumerating services that run as root and listen to
messages on the System Bus, performing both code reviews and dynamic analysis.

Chaining the issues, an attacker in control of a rogue D-Bus service that can
send an arbitrary signal, can deploy backdoors on the compromised final touches.



The researchers were able to develop their own exploit that runs an arbitrary
script as root. The exploit also copies /bin/sh to the /tmp directory,
sets /tmp/sh as a Set-UID (SUID) executable, and then invokes “/tmp/sh -p”. (the
“-p” flag is necessary to force the shell to not drop privileges)

Researchers recommend users of networkd-dispatcher to update their installs.

“To address the specific vulnerabilities at play, Microsoft Defender for
Endpoint’s endpoint detection and response (EDR) capabilities detect the
directory traversal attack required to leverage Nimbuspwn.” concludes the post.

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Pierluigi Paganini

(SecurityAffairs – hacking, Nimbuspwn flaws)





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PIERLUIGI PAGANINI

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and
Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he
is also a Security Evangelist, Security Analyst and Freelance Writer.
Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security
expert with over 20 years experience in the field, he is Certified Ethical
Hacker at EC Council in London. The passion for writing and a strong belief that
security is founded on sharing and awareness led Pierluigi to find the security
blog "Security Affairs" recently named a Top National Security Resource for US.
Pierluigi is a member of the "The Hacker News" team and he is a writer for some
major publications in the field such as Cyber War Zone, ICTTF, Infosec Island,
Infosec Institute, The Hacker News Magazine and for many other Security
magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency
and Bitcoin”.




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