Executive Summary



This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Summary
Title Linux kernel (Azure) vulnerabilities
Informations
NameUSN-3871-5First vendor Publication2019-02-07
VendorUbuntuLast vendor Modification2019-02-07
Severity (Vendor) N/ARevisionN/A

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score7.2Attack RangeLocal
Cvss Impact Score10Attack ComplexityLow
Cvss Expoit Score3.9AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux-azure: Linux kernel for Microsoft Azure Cloud systems

Details:

Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-10876, CVE-2018-10879)

Wen Xu discovered that a buffer overflow existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-10877)

Wen Xu discovered that an out-of-bounds write vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-10878, CVE-2018-10882)

Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly ensure that xattr information remained in inode bodies. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash). (CVE-2018-10880)

Wen Xu discovered that the ext4 file system implementation in the Linux kernel could possibly perform an out of bounds write when updating the journal for an inline file. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash). (CVE-2018-10883)

It was discovered that a race condition existed in the vsock address family implementation of the Linux kernel that could lead to a use-after-free condition. A local attacker in a guest virtual machine could use this to expose sensitive information (host machine kernel memory). (CVE-2018-14625)

Cfir Cohen discovered that a use-after-free vulnerability existed in the KVM implementation of the Linux kernel, when handling interrupts in environments where nested virtualization is in use (nested KVM virtualization is not enabled by default in Ubuntu kernels). A local attacker in a guest VM could possibly use this to gain administrative privileges in a host machine. (CVE-2018-16882)

Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. (CVE-2018-17972)

Jann Horn discovered that the mremap() system call in the Linux kernel did not properly flush the TLB when completing, potentially leaving access to a physical page after it has been released to the page allocator. A local attacker could use this to cause a denial of service (system crash), expose sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)

Wei Wu discovered that the KVM implementation in the Linux kernel did not properly ensure that ioapics were initialized. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-19407)

It was discovered that the debug interface for the Linux kernel's HID subsystem did not properly perform bounds checking in some situations. An attacker with access to debugfs could use this to cause a denial of service or possibly gain additional privileges. (CVE-2018-9516)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS:
linux-image-4.15.0-1037-azure 4.15.0-1037.39
linux-image-azure 4.15.0.1037.37

Ubuntu 16.04 LTS:
linux-image-4.15.0-1037-azure 4.15.0-1037.39~16.04.1
linux-image-azure 4.15.0.1037.42

Ubuntu 14.04 LTS:
linux-image-4.15.0-1037-azure 4.15.0-1037.39~14.04.2
linux-image-azure 4.15.0.1037.24

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References:
https://usn.ubuntu.com/usn/usn-3871-5
https://usn.ubuntu.com/usn/usn-3871-1
CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,
CVE-2018-10880, CVE-2018-10882, CVE-2018-10883, CVE-2018-14625,
CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407,
CVE-2018-9516

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1037.39
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1037.39~16.04.1
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1037.39~14.04.2

Original Source

Url : http://www.ubuntu.com/usn/USN-3871-5

CWE : Common Weakness Enumeration

%idName
38 %CWE-787Out-of-bounds Write (CWE/SANS Top 25)
23 %CWE-416Use After Free
8 %CWE-476NULL Pointer Dereference
8 %CWE-362Race Condition
8 %CWE-284Access Control (Authorization) Issues
8 %CWE-125Out-of-bounds Read
8 %CWE-20Improper Input Validation

CPE : Common Platform Enumeration

TypeDescriptionCount
Os5
Os2
Os1
Os2997
Os1
Os1
Os2
Os1
Os1
Os1
Os1
Os1

Nessus® Vulnerability Scanner

DateDescription
2019-01-14Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2019-1145.nasl - Type : ACT_GATHER_INFO
2019-01-10Name : The remote Amazon Linux 2 host is missing a security update.
File : al2_ALAS-2019-1145.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-3857a8b41a.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-ec3bf1b228.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-9f4381d8c4.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-6e8c330d50.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-2645eb8dab.nasl - Type : ACT_GATHER_INFO
2019-01-03Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-87ba0312c2.nasl - Type : ACT_GATHER_INFO
2018-12-28Name : The remote EulerOS host is missing multiple security updates.
File : EulerOS_SA-2018-1432.nasl - Type : ACT_GATHER_INFO
2018-12-21Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2018-1133.nasl - Type : ACT_GATHER_INFO
2018-12-20Name : The remote Amazon Linux 2 host is missing a security update.
File : al2_ALAS-2018-1133.nasl - Type : ACT_GATHER_INFO
2018-11-16Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2018-3083.nasl - Type : ACT_GATHER_INFO
2018-11-09Name : The remote Amazon Linux 2 host is missing a security update.
File : al2_ALAS-2018-1100.nasl - Type : ACT_GATHER_INFO
2018-11-08Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2018-1100.nasl - Type : ACT_GATHER_INFO
2018-10-17Name : The remote Fedora host is missing one or more security updates.
File : fedora_2018-2ee3411cb8.nasl - Type : ACT_GATHER_INFO
2018-10-04Name : The remote Debian host is missing a security update.
File : debian_DLA-1531.nasl - Type : ACT_GATHER_INFO
2018-10-02Name : The remote PhotonOS host is missing multiple security updates.
File : PhotonOS_PHSA-2018-1_0-0188.nasl - Type : ACT_GATHER_INFO
2018-10-02Name : The remote Debian host is missing a security-related update.
File : debian_DSA-4308.nasl - Type : ACT_GATHER_INFO
2018-07-20Name : The remote Debian host is missing a security update.
File : debian_DLA-1423.nasl - Type : ACT_GATHER_INFO

Alert History

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0
DateInformations
2019-02-08 00:19:14
  • First insertion