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 (Xenial HWE) vulnerabilities
Informations
NameUSN-4211-2First vendor Publication2019-12-03
VendorUbuntuLast vendor Modification2019-12-03
Severity (Vendor) N/ARevisionN/A

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Cvss Base Score7.5Attack RangeNetwork
Cvss Impact Score6.4Attack ComplexityLow
Cvss Expoit Score10AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-4211-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 ESM.

Zhipeng Xie discovered that an infinite loop could be triggered in the CFS Linux kernel process scheduler. A local attacker could possibly use this to cause a denial of service. (CVE-2018-20784)

Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel did not properly validate SSID lengths. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2019-17133)

Nicolas Waisman discovered that the Chelsio T4/T5 RDMA Driver for the Linux kernel performed DMA from a kernel stack. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-17075)

Update instructions:

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

Ubuntu 14.04 ESM:
linux-image-4.4.0-1059-aws 4.4.0-1059.63
linux-image-4.4.0-170-generic 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-generic-lpae 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-lowlatency 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-powerpc-e500mc 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-powerpc-smp 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-powerpc64-emb 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-powerpc64-smp 4.4.0-170.199~14.04.1
linux-image-aws 4.4.0.1059.60
linux-image-generic-lpae-lts-xenial 4.4.0.170.149
linux-image-generic-lts-xenial 4.4.0.170.149
linux-image-lowlatency-lts-xenial 4.4.0.170.149
linux-image-powerpc-e500mc-lts-xenial 4.4.0.170.149
linux-image-powerpc-smp-lts-xenial 4.4.0.170.149
linux-image-powerpc64-emb-lts-xenial 4.4.0.170.149
linux-image-powerpc64-smp-lts-xenial 4.4.0.170.149
linux-image-virtual-lts-xenial 4.4.0.170.149

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/4211-2
https://usn.ubuntu.com/4211-1
CVE-2018-20784, CVE-2019-17075, CVE-2019-17133

Original Source

Url : http://www.ubuntu.com/usn/USN-4211-2

CWE : Common Weakness Enumeration

%idName
33 %CWE-400Uncontrolled Resource Consumption ('Resource Exhaustion')
33 %CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') (CWE/SANS Top 25)
33 %CWE-119Failure to Constrain Operations within the Bounds of a Memory Buffer

CPE : Common Platform Enumeration

TypeDescriptionCount
Os3317

Alert History

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0
1
DateInformations
2019-12-03 09:23:37
  • Multiple Updates
2019-12-03 09:20:17
  • First insertion