Rapid7 Vulnerability & Exploit Database

Ubuntu: (Multiple Advisories) (CVE-2024-43882): Linux kernel vulnerabilities

Free InsightVM Trial No Credit Card Necessary
2024 Attack Intel Report Latest research by Rapid7 Labs
Back to Search

Ubuntu: (Multiple Advisories) (CVE-2024-43882): Linux kernel vulnerabilities

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
08/21/2024
Created
11/05/2024
Added
11/04/2024
Modified
11/26/2024

Description

In the Linux kernel, the following vulnerability has been resolved: exec: Fix ToCToU between perm check and set-uid/gid usage When opening a file for exec via do_filp_open(), permission checking is done against the file's metadata at that moment, and on success, a file pointer is passed back. Much later in the execve() code path, the file metadata (specifically mode, uid, and gid) is used to determine if/how to set the uid and gid. However, those values may have changed since the permissions check, meaning the execution may gain unintended privileges. For example, if a file could change permissions from executable and not set-id: ---------x 1 root root 16048 Aug 7 13:16 target to set-id and non-executable: ---S------ 1 root root 16048 Aug 7 13:16 target it is possible to gain root privileges when execution should have been disallowed. While this race condition is rare in real-world scenarios, it has been observed (and proven exploitable) when package managers are updating the setuid bits of installed programs. Such files start with being world-executable but then are adjusted to be group-exec with a set-uid bit. For example, "chmod o-x,u+s target" makes "target" executable only by uid "root" and gid "cdrom", while also becoming setuid-root: -rwxr-xr-x 1 root cdrom 16048 Aug 7 13:16 target becomes: -rwsr-xr-- 1 root cdrom 16048 Aug 7 13:16 target But racing the chmod means users without group "cdrom" membership can get the permission to execute "target" just before the chmod, and when the chmod finishes, the exec reaches brpm_fill_uid(), and performs the setuid to root, violating the expressed authorization of "only cdrom group members can setuid to root". Re-check that we still have execute permissions in case the metadata has changed. It would be better to keep a copy from the perm-check time, but until we can do that refactoring, the least-bad option is to do a full inode_permission() call (under inode lock). It is understood that this is safe against dead-locks, but hardly optimal.

Solution(s)

  • ubuntu-upgrade-linux-image-4-15-0-1137-oracle
  • ubuntu-upgrade-linux-image-4-15-0-1158-kvm
  • ubuntu-upgrade-linux-image-4-15-0-1168-gcp
  • ubuntu-upgrade-linux-image-4-15-0-1175-aws
  • ubuntu-upgrade-linux-image-4-15-0-1183-azure
  • ubuntu-upgrade-linux-image-4-15-0-231-generic
  • ubuntu-upgrade-linux-image-4-15-0-231-lowlatency
  • ubuntu-upgrade-linux-image-5-15-0-1038-xilinx-zynqmp
  • ubuntu-upgrade-linux-image-5-15-0-1055-gkeop
  • ubuntu-upgrade-linux-image-5-15-0-1065-ibm
  • ubuntu-upgrade-linux-image-5-15-0-1065-raspi
  • ubuntu-upgrade-linux-image-5-15-0-1067-nvidia
  • ubuntu-upgrade-linux-image-5-15-0-1067-nvidia-lowlatency
  • ubuntu-upgrade-linux-image-5-15-0-1069-gke
  • ubuntu-upgrade-linux-image-5-15-0-1069-kvm
  • ubuntu-upgrade-linux-image-5-15-0-1070-oracle
  • ubuntu-upgrade-linux-image-5-15-0-1071-gcp
  • ubuntu-upgrade-linux-image-5-15-0-1072-aws
  • ubuntu-upgrade-linux-image-5-15-0-1075-azure
  • ubuntu-upgrade-linux-image-5-15-0-125-generic
  • ubuntu-upgrade-linux-image-5-15-0-125-generic-64k
  • ubuntu-upgrade-linux-image-5-15-0-125-generic-lpae
  • ubuntu-upgrade-linux-image-5-15-0-125-lowlatency
  • ubuntu-upgrade-linux-image-5-15-0-125-lowlatency-64k
  • ubuntu-upgrade-linux-image-5-4-0-1044-iot
  • ubuntu-upgrade-linux-image-5-4-0-1054-xilinx-zynqmp
  • ubuntu-upgrade-linux-image-5-4-0-1082-ibm
  • ubuntu-upgrade-linux-image-5-4-0-1094-bluefield
  • ubuntu-upgrade-linux-image-5-4-0-1102-gkeop
  • ubuntu-upgrade-linux-image-5-4-0-1119-raspi
  • ubuntu-upgrade-linux-image-5-4-0-1123-kvm
  • ubuntu-upgrade-linux-image-5-4-0-1134-oracle
  • ubuntu-upgrade-linux-image-5-4-0-1135-aws
  • ubuntu-upgrade-linux-image-5-4-0-1139-azure
  • ubuntu-upgrade-linux-image-5-4-0-1139-gcp
  • ubuntu-upgrade-linux-image-5-4-0-1140-azure
  • ubuntu-upgrade-linux-image-5-4-0-200-generic
  • ubuntu-upgrade-linux-image-5-4-0-200-generic-lpae
  • ubuntu-upgrade-linux-image-5-4-0-200-lowlatency
  • ubuntu-upgrade-linux-image-6-8-0-1014-gke
  • ubuntu-upgrade-linux-image-6-8-0-1015-raspi
  • ubuntu-upgrade-linux-image-6-8-0-1016-ibm
  • ubuntu-upgrade-linux-image-6-8-0-1016-oracle
  • ubuntu-upgrade-linux-image-6-8-0-1016-oracle-64k
  • ubuntu-upgrade-linux-image-6-8-0-1017-oem
  • ubuntu-upgrade-linux-image-6-8-0-1018-azure
  • ubuntu-upgrade-linux-image-6-8-0-1018-azure-fde
  • ubuntu-upgrade-linux-image-6-8-0-1018-gcp
  • ubuntu-upgrade-linux-image-6-8-0-1018-nvidia
  • ubuntu-upgrade-linux-image-6-8-0-1018-nvidia-64k
  • ubuntu-upgrade-linux-image-6-8-0-1018-nvidia-lowlatency
  • ubuntu-upgrade-linux-image-6-8-0-1018-nvidia-lowlatency-64k
  • ubuntu-upgrade-linux-image-6-8-0-1019-aws
  • ubuntu-upgrade-linux-image-6-8-0-49-generic
  • ubuntu-upgrade-linux-image-6-8-0-49-generic-64k
  • ubuntu-upgrade-linux-image-6-8-0-49-lowlatency
  • ubuntu-upgrade-linux-image-6-8-0-49-lowlatency-64k
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-aws-hwe
  • ubuntu-upgrade-linux-image-aws-lts-18-04
  • ubuntu-upgrade-linux-image-aws-lts-20-04
  • ubuntu-upgrade-linux-image-aws-lts-22-04
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-azure-fde
  • ubuntu-upgrade-linux-image-azure-lts-18-04
  • ubuntu-upgrade-linux-image-azure-lts-20-04
  • ubuntu-upgrade-linux-image-azure-lts-22-04
  • ubuntu-upgrade-linux-image-bluefield
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-gcp-lts-18-04
  • ubuntu-upgrade-linux-image-gcp-lts-20-04
  • ubuntu-upgrade-linux-image-gcp-lts-22-04
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-64k
  • ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-64k-hwe-22-04
  • ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
  • ubuntu-upgrade-linux-image-generic-hwe-16-04
  • ubuntu-upgrade-linux-image-generic-hwe-18-04
  • ubuntu-upgrade-linux-image-generic-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-hwe-22-04
  • ubuntu-upgrade-linux-image-generic-hwe-24-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-gke-5-15
  • ubuntu-upgrade-linux-image-gkeop
  • ubuntu-upgrade-linux-image-gkeop-5-15
  • ubuntu-upgrade-linux-image-gkeop-5-4
  • ubuntu-upgrade-linux-image-ibm
  • ubuntu-upgrade-linux-image-ibm-classic
  • ubuntu-upgrade-linux-image-ibm-lts-20-04
  • ubuntu-upgrade-linux-image-ibm-lts-24-04
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-64k
  • ubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04
  • ubuntu-upgrade-linux-image-lowlatency-64k-hwe-22-04
  • ubuntu-upgrade-linux-image-lowlatency-64k-hwe-24-04
  • ubuntu-upgrade-linux-image-lowlatency-hwe-16-04
  • ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
  • ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
  • ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
  • ubuntu-upgrade-linux-image-lowlatency-hwe-24-04
  • ubuntu-upgrade-linux-image-nvidia
  • ubuntu-upgrade-linux-image-nvidia-6-8
  • ubuntu-upgrade-linux-image-nvidia-64k
  • ubuntu-upgrade-linux-image-nvidia-64k-6-8
  • ubuntu-upgrade-linux-image-nvidia-64k-hwe-22-04
  • ubuntu-upgrade-linux-image-nvidia-hwe-22-04
  • ubuntu-upgrade-linux-image-nvidia-lowlatency
  • ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
  • ubuntu-upgrade-linux-image-oem
  • ubuntu-upgrade-linux-image-oem-20-04
  • ubuntu-upgrade-linux-image-oem-20-04b
  • ubuntu-upgrade-linux-image-oem-20-04c
  • ubuntu-upgrade-linux-image-oem-20-04d
  • ubuntu-upgrade-linux-image-oem-22-04
  • ubuntu-upgrade-linux-image-oem-22-04a
  • ubuntu-upgrade-linux-image-oem-22-04b
  • ubuntu-upgrade-linux-image-oem-22-04c
  • ubuntu-upgrade-linux-image-oem-22-04d
  • ubuntu-upgrade-linux-image-oem-24-04
  • ubuntu-upgrade-linux-image-oem-24-04a
  • ubuntu-upgrade-linux-image-oem-osp1
  • ubuntu-upgrade-linux-image-oracle
  • ubuntu-upgrade-linux-image-oracle-64k
  • ubuntu-upgrade-linux-image-oracle-lts-18-04
  • ubuntu-upgrade-linux-image-oracle-lts-20-04
  • ubuntu-upgrade-linux-image-oracle-lts-22-04
  • ubuntu-upgrade-linux-image-raspi
  • ubuntu-upgrade-linux-image-raspi-hwe-18-04
  • ubuntu-upgrade-linux-image-raspi-nolpae
  • ubuntu-upgrade-linux-image-raspi2
  • ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-hwe-16-04
  • ubuntu-upgrade-linux-image-virtual-hwe-18-04
  • ubuntu-upgrade-linux-image-virtual-hwe-20-04
  • ubuntu-upgrade-linux-image-virtual-hwe-22-04
  • ubuntu-upgrade-linux-image-virtual-hwe-24-04
  • ubuntu-upgrade-linux-image-xilinx-zynqmp

insightVM

Advanced vulnerability management analytics and reporting.
Key Features
  • Lightweight Endpoint Agent
  • Live Dashboards
  • Real Risk Prioritization
  • IT-Integrated Remediation Projects
  • Cloud, Virtual, and Container Assessment
  • Integrated Threat Feeds
  • Easy-to-Use RESTful API
  • Automation-Assisted Patching
  • Automated Containment
Free InsightVM Trial View All Features

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;