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Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel vulnerabilities (USN-6416-1)

critical Nessus Plugin ID 182558

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 20.04 LTS / 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6416-1 advisory.

 - A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel's IPv6 functionality when a user makes a new kind of SYN flood attack. A user located in the local network or with a high bandwidth connection can increase the CPU usage of the server that accepts IPV6 connections up to 95%. (CVE-2023-1206)

 - A side channel vulnerability on some of the AMD CPUs may allow an attacker to influence the return address prediction. This may result in speculative execution at an attacker-controlled address, potentially leading to information disclosure. (CVE-2023-20569)

 - A flaw was found in the networking subsystem of the Linux kernel within the handling of the RPL protocol.
 This issue results from the lack of proper handling of user-supplied data, which can lead to an assertion failure. This may allow an unauthenticated remote attacker to create a denial of service condition on the system. (CVE-2023-2156)

 - A null pointer dereference flaw was found in the Linux kernel's DECnet networking protocol. This issue could allow a remote user to crash the system. (CVE-2023-3338)

 - An issue was discovered in the Linux kernel before 6.3.10. fs/smb/server/smb2misc.c in ksmbd does not validate the relationship between the command payload size and the RFC1002 length specification, leading to an out-of-bounds read. (CVE-2023-38432)

 - A use-after-free flaw was found in nfc_llcp_find_local in net/nfc/llcp_core.c in NFC in the Linux kernel.
 This flaw allows a local user with special privileges to impact a kernel information leak issue.
 (CVE-2023-3863)

 - A use-after-free vulnerability was found in the siano smsusb module in the Linux kernel. The bug occurs during device initialization when the siano device is plugged in. This flaw allows a local user to crash the system, causing a denial of service condition. (CVE-2023-4132)

 - A flaw was found in KVM AMD Secure Encrypted Virtualization (SEV) in the Linux kernel. A KVM guest using SEV-ES or SEV-SNP with multiple vCPUs can trigger a double fetch race condition vulnerability and invoke the `VMGEXIT` handler recursively. If an attacker manages to call the handler multiple times, they can trigger a stack overflow and cause a denial of service or potentially guest-to-host escape in kernel configurations without stack guard pages (`CONFIG_VMAP_STACK`). (CVE-2023-4155)

 - A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 (tun: tun_chr_open(): correctly initialize socket uid), - 66b2c338adce (tap: tap_open():
 correctly initialize socket uid), pass inode->i_uid to sock_init_data_uid() as the last parameter and that turns out to not be accurate. (CVE-2023-4194)

 - A flaw was found in the exFAT driver of the Linux kernel. The vulnerability exists in the implementation of the file name reconstruction function, which is responsible for reading file name entries from a directory index and merging file name parts belonging to one file into a single long file name. Since the file name characters are copied into a stack variable, a local privileged attacker could use this flaw to overflow the kernel stack. (CVE-2023-4273)

 - An issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5. There is an integer signedness error, leading to a buffer overflow and remote code execution via HELLO or one of the AUTH frames. This occurs because of an untrusted length taken from a TCP packet in ceph_decode_32.
 (CVE-2023-44466)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected kernel package.

See Also

https://ubuntu.com/security/notices/USN-6416-1

Plugin Details

Severity: Critical

ID: 182558

File Name: ubuntu_USN-6416-1.nasl

Version: 1.2

Type: local

Agent: unix

Published: 10/4/2023

Updated: 1/9/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C

CVSS Score Source: CVE-2023-38432

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1030-gkeop, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1037-nvidia, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1037-nvidia-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1040-ibm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1044-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1045-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1047-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1049-azure-fde, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-86-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-86-generic-64k, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-86-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-86-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-86-lowlatency-64k

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/4/2023

Vulnerability Publication Date: 5/9/2023

Reference Information

CVE: CVE-2023-1206, CVE-2023-20569, CVE-2023-2156, CVE-2023-3338, CVE-2023-38432, CVE-2023-3863, CVE-2023-3865, CVE-2023-3866, CVE-2023-4132, CVE-2023-4155, CVE-2023-4194, CVE-2023-4273, CVE-2023-44466

USN: 6416-1