Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-3695-1)

medium Nessus Plugin ID 110894

Synopsis

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

Description

The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3695-1 advisory.

- The ext4_fill_super function in fs/ext4/super.c in the Linux kernel through 4.15.15 does not always initialize the crc32c checksum driver, which allows attackers to cause a denial of service (ext4_xattr_inode_hash NULL pointer dereference and system crash) via a crafted ext4 image.
(CVE-2018-1094)

- The cdrom_ioctl_media_changed function in drivers/cdrom/cdrom.c in the Linux kernel before 4.16.6 allows local attackers to use a incorrect bounds check in the CDROM driver CDROM_MEDIA_CHANGED ioctl to read out kernel memory. (CVE-2018-10940)

- The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image. (CVE-2018-1095)

- The compat_get_timex function in kernel/compat.c in the Linux kernel before 4.16.9 allows local users to obtain sensitive information from kernel memory via adjtimex. (CVE-2018-11508)

- An issue was discovered in the fd_locked_ioctl function in drivers/block/floppy.c in the Linux kernel through 4.15.7. The floppy driver will copy a kernel pointer to user memory in response to the FDGETPRM ioctl. An attacker can send the FDGETPRM ioctl and use the obtained kernel pointer to discover the location of kernel code and data and bypass kernel security protections such as KASLR. (CVE-2018-7755)

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-3695-1

Plugin Details

Severity: Medium

ID: 110894

File Name: ubuntu_USN-3695-1.nasl

Version: 1.10

Type: local

Agent: unix

Published: 7/3/2018

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: 4.4

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

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

CVSS Score Source: CVE-2018-7755

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1009-oem, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1010-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1011-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1012-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1013-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1014-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-24-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-24-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-24-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-24-snapdragon, cpe:/o:canonical:ubuntu_linux:18.04:-:lts

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: 7/2/2018

Vulnerability Publication Date: 3/8/2018

Reference Information

CVE: CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508, CVE-2018-7755

USN: 3695-1