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Ubuntu 14.04 LTS / 16.04 LTS : Linux kernel (HWE) vulnerabilities (USN-3931-2)

high Nessus Plugin ID 123679

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Synopsis

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

Description

The remote Ubuntu 14.04 LTS / 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3931-2 advisory.

 - An issue was discovered in the Linux kernel through 4.17.11, as used in Xen through 4.11.x. The xen_failsafe_callback entry point in arch/x86/entry/entry_64.S does not properly maintain RBX, which allows local users to cause a denial of service (uninitialized memory usage and system crash). Within Xen, 64-bit x86 PV Linux guest OS users can trigger a guest OS crash or possibly gain privileges.
 (CVE-2018-14678)

 - arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes. (CVE-2018-18021)

 - In the Linux kernel through 4.19.6, a local user could exploit a use-after-free in the ALSA driver by supplying a malicious USB Sound device (with zero interfaces) that is mishandled in usb_audio_probe in sound/usb/card.c. (CVE-2018-19824)

 - A heap address information leak while using L2CAP_GET_CONF_OPT was discovered in the Linux kernel before 5.1-rc1. (CVE-2019-3459)

 - A heap data infoleak in multiple locations including L2CAP_PARSE_CONF_RSP was found in the Linux kernel before 5.1-rc1. (CVE-2019-3460)

 - In the Linux kernel before 4.20.8, kvm_ioctl_create_device in virt/kvm/kvm_main.c mishandles reference counting because of a race condition, leading to a use-after-free. (CVE-2019-6974)

 - The KVM implementation in the Linux kernel through 4.20.5 has a Use-after-Free. (CVE-2019-7221)

 - The KVM implementation in the Linux kernel through 4.20.5 has an Information Leak. (CVE-2019-7222)

 - kernel/bpf/verifier.c in the Linux kernel before 4.20.6 performs undesirable out-of-bounds speculation on pointer arithmetic in various cases, including cases of different branches with different state or limits to sanitize, leading to side-channel attacks. (CVE-2019-7308)

 - In the Linux kernel through 4.20.11, af_alg_release() in crypto/af_alg.c neglects to set a NULL value for a certain structure member, which leads to a use-after-free in sockfs_setattr. (CVE-2019-8912)

 - A memory leak in the kernel_read_file function in fs/exec.c in the Linux kernel through 4.20.11 allows attackers to cause a denial of service (memory consumption) by triggering vfs_read failures.
 (CVE-2019-8980)

 - In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task. (CVE-2019-9213)

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-3931-2

Plugin Details

Severity: High

ID: 123679

File Name: ubuntu_USN-3931-2.nasl

Version: 1.11

Type: local

Agent: unix

Published: 4/3/2019

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: 7.2

Temporal Score: 6

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

CVSS Score Source: CVE-2019-8912

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.5

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

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

CVSS Score Source: CVE-2019-6974

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1010-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1029-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1035-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1041-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-47-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-47-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-47-lowlatency, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-: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: 4/2/2019

Vulnerability Publication Date: 7/28/2018

Exploitable With

Metasploit (Reliable Datagram Sockets (RDS) rds_atomic_free_op NULL pointer dereference Privilege Escalation)

Reference Information

CVE: CVE-2018-14678, CVE-2018-18021, CVE-2018-19824, CVE-2019-3459, CVE-2019-3460, CVE-2019-6974, CVE-2019-7221, CVE-2019-7222, CVE-2019-7308, CVE-2019-8912, CVE-2019-8980, CVE-2019-9213

USN: 3931-2