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Three Innocuous Linux Vulnerabilities Chained to Acquire Full Root Privileges

By Eduard Kovacs on December 02, 2022

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Qualys’ Risk Analysis Unit has proven how a brand new Linux vulnerability might be chained with two different apparently innocent flaws to achieve full root privileges on an affected system.

The brand new vulnerability, tracked as CVE-2022-3328, is a race situation in Snapd, a Canonical-developed instrument used for the Snap software program packaging and deployment system. Particularly, the flaw impacts the ‘snap-confine’ program utilized by Snapd to assemble the execution atmosphere for Snap functions.

The affected program is current by default in Ubuntu, whose builders described CVE-2022-3328 as a high-severity flaw that may be exploited for native privilege escalation and arbitrary code execution.

Qualys researchers have proven how CVE-2022-3328 might be mixed with different innocuous vulnerabilities for a high-impact assault.

The researchers chained CVE-2022-3328 — this challenge was launched in February 2022 by the patch for a flaw tracked as CVE-2021-44731 — with two lately found points affecting Multipathd. Multipathd is a daemon answerable for checking for failed paths that’s operating as root within the default set up of Ubuntu and different distributions.

Multipathd is affected by an authorization bypass challenge that may be exploited by an unprivileged consumer to challenge privileged instructions to Multipathd (CVE-2022-41974), and a symlink assault (CVE-2022-41973) that can be utilized to power the execution of malicious code.

Chaining the Snapd vulnerability with the 2 Multipathd flaws can permit any unprivileged consumer to achieve root privileges on a weak gadget.

“Qualys safety researchers have verified the vulnerability, developed an exploit and obtained full root privileges on default installations of Ubuntu,” Qualys mentioned.

The vulnerability is just not exploitable remotely, however the cybersecurity agency warns that it’s harmful as a result of it may be exploited by an unprivileged consumer.

Qualys has made accessible an advisory containing technical info, however a proof-of-concept (PoC) exploit is just not being launched right now.

The US Cybersecurity and Infrastructure Safety Company (CISA) is conscious of greater than a dozen Linux vulnerabilities which have been exploited in assaults, together with a flaw exploited within the wild by a stealthy Linux malware named Shikitega, and the safety gap referred to as PwnKit.

Associated: Polkit Vulnerability Supplies Root Privileges on Linux Techniques

Associated: Google Boosts Bug Bounty Rewards for Linux Kernel Vulnerabilities

Associated: ‘DirtyCred’ Vulnerability Haunting Linux Kernel for eight Years

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