Alerts This Week
Warning Icon 1 483
Alerts This Week
Warning Icon 1 483

Ubuntu 12.04 ESM: USN-4901-1 Critical Denial of Service Threats

ubuntu
Calendar Grey April 6, 2021
Dist Ubuntu Esm H88
Remedial actions for various vulnerabilities within Ubuntu's Linux kernel aimed at safeguarding against potential service interruptions and safeguarding sensitive information.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM

Details:

Adam Nichols discovered that heap overflows existed in the iSCSI subsystem

in the Linux kernel. A local attacker could use this to cause a denial of

service (system crash) or possibly execute arbitrary code. (CVE-2021-27365)

It was discovered that the LIO SCSI target implementation in the Linux

kernel performed insufficient identifier checking in certain XCOPY

requests. An attacker with access to at least one LUN in a multiple

backstore environment could use this to expose sensitive information or

modify data. (CVE-2020-28374)

Adam Nichols discovered that the iSCSI subsystem in the Linux kernel did

not properly restrict access to iSCSI transport handles. A local attacker

could use this to cause a denial of service or expose sensitive information

(kernel pointer addresses). (CVE-2021-27363)

Adam Nichols discover...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service heap overflow kernel information exposure ubuntu

Update Instructions

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

Ubuntu 12.04 ESM:
  linux-image-3.13.0-185-generic  3.13.0-185.236~12.04.1
  linux-image-generic-lts-trusty  3.13.0.185.170

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://ubuntu.com/security/notices/USN-4901-1

CVE-2020-28374, CVE-2021-27363, CVE-2021-27364, CVE-2021-27365

Severity
critical
Lowest
Low
Medium
High
Critical

April 06, 2021

Topics%20covered

Topics Covered

security advisory denial of service heap overflow kernel information exposure ubuntu

Package Information

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here