Two Extreme Linux Vulnerabilities Influence 40% of Ubuntu Customers

Jul 27, 2023THNLinux / Endpoint Safety

Linux Vulnerabilities

Cybersecurity researchers have disclosed two high-severity safety flaws within the Ubuntu kernel that might pave the way in which for native privilege escalation assaults.

Cloud safety agency Wiz, in a report shared with The Hacker Information, stated the easy-to-exploit shortcomings have the potential to impression 40% of Ubuntu customers.

“The impacted Ubuntu variations are prevalent within the cloud as they function the default working techniques for a number of [cloud service providers],” safety researchers Sagi Tzadik and Shir Tamari stated.

The vulnerabilities – tracked as CVE-2023-32629 and 2023-2640 (CVSS scores: 7.8) and dubbed GameOver(lay) – are current in a module known as OverlayFS and come up on account of insufficient permissions checks in sure eventualities, enabling a neighborhood attacker to realize elevated privileges.

Overlay Filesystem refers to a union mount file system that makes it doable to mix a number of listing bushes or file techniques right into a single, unified filesystem.

A quick description of the 2 flaws is under –

  • CVE-2023-2640 – On Ubuntu kernels carrying each c914c0e27eb0 and “UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs,” an unprivileged person could set privileged prolonged attributes on the mounted recordsdata, main them to be set on the higher recordsdata with out the suitable safety checks.
  • CVE-2023-32629 – Native privilege escalation vulnerability in Ubuntu Kernels overlayfs ovl_copy_up_meta_inode_data skip permission checks when calling ovl_do_setxattr on Ubuntu kernels

In a nutshell, GameOver(lay) makes it doable to “craft an executable file with scoped file capabilities and trick the Ubuntu Kernel into copying it to a special


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location with unscoped capabilities, granting anybody who executes it root-like privileges.”

Following accountable disclosure, the vulnerabilities have been fastened by Ubuntu as of July 24, 2023.

The findings underscore the truth that refined adjustments within the Linux kernel launched by Ubuntu may have unexpected implications, Wiz CTO and co-founder Ami Luttwak stated in a press release shared with the publication.

“Each vulnerabilities are distinctive to Ubuntu kernels since they stemmed from Ubuntu’s particular person adjustments to the OverlayFS module,” the researchers stated, including the problems are similar to different vulnerabilities resembling CVE-2016-1576, CVE-2021-3493, CVE-2021-3847, and CVE-2023-0386.

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