Executive Summary

Summary
Title Linux kernel (AWS) vulnerabilities
Informations
NameUSN-3833-1First vendor Publication2018-11-30
VendorUbuntuLast vendor Modification2018-11-30
Severity (Vendor) N/ARevisionN/A

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:P/I:N/A:N)
Cvss Base Score2.1Attack RangeLocal
Cvss Impact Score2.9Attack 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

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux-aws: Linux kernel for Amazon Web Services (AWS) systems

Details:

Jann Horn discovered that the Linux kernel mishandles mapping UID or GID ranges inside nested user namespaces in some situations. A local attacker could use this to bypass access controls on resources outside the namespace. (CVE-2018-18955)

Philipp Wendler discovered that the overlayfs implementation in the Linux kernel did not properly verify the directory contents permissions from within a unprivileged user namespace. A local attacker could use this to expose sensitive information (protected file names). (CVE-2018-6559)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1029-aws 4.15.0-1029.30
linux-image-aws 4.15.0.1029.29

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-3833-1
CVE-2018-18955, CVE-2018-6559

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1029.30

Original Source

Url : http://www.ubuntu.com/usn/USN-3833-1

CWE : Common Weakness Enumeration

%idName
100 %CWE-200Information Exposure

CPE : Common Platform Enumeration

TypeDescriptionCount
Os3
Os1

Alert History

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0
1
DateInformations
2018-12-07 00:21:24
  • Multiple Updates
2018-11-30 09:19:02
  • First insertion