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CISA Tells Organizations to Patch Linux Kernel Vulnerability Exploited by Malware

By Eduard Kovacs on October 21, 2022

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The US Cybersecurity and Infrastructure Safety Company (CISA) on Thursday added a Linux kernel flaw to its Identified Exploited Vulnerabilities Catalog and instructed federal companies to deal with it inside three weeks.

The vulnerability is tracked as CVE-2021-3493 and it’s associated to the OverlayFS file system implementation within the Linux kernel. It permits an unprivileged native consumer to achieve root privileges, however it solely seems to have an effect on Ubuntu.

CVE-2021-3493 has been exploited within the wild by a stealthy Linux malware named Shikitega, which researchers at AT&T Alien Labs detailed in early September. Shikitega is designed to focus on endpoints and IoT units operating Linux, permitting the attacker to achieve full management of the system. It has additionally been used to obtain a cryptocurrency miner onto the contaminated system.

As a part of the malware’s an infection chain, two Linux vulnerabilities are exploited for privilege escalation: CVE-2021-3493 and CVE-2021-4034.

CVE-2021-4034 is known as PwnKit and it impacts Polkit’s Pkexec, a SUID-root program present in all Linux distributions. CISA warned about this vulnerability being exploited in assaults in June. Cisco talked about exploitation in a current report describing a Chinese language assault framework and its related RAT, which targets Home windows, Linux, and macOS methods.

The information stories revealed when Shikitega’s existence got here to gentle targeted on the malware itself and didn’t spotlight the truth that this seemed to be the primary identified occasion of CVE-2021-3493 being exploited for malicious functions.

Technical particulars and proof-of-concept (PoC) exploits for this vulnerability are publicly obtainable.

CISA has now added the flaw to its Identified Exploited Vulnerabilities Catalog and has instructed federal companies to patch their methods till November 10. Whereas federal companies are required by a binding operational directive to repair these flaws, CISA strongly urges all organizations to prioritize patching for vulnerabilities listed in its catalog.

As well as, CISA has added a current Zimbra vulnerability to the catalog. The safety gap was solely patched after exploitation started.

*up to date to make clear that solely Ununtu is affected by CVE-2021-3493

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