1. Ubuntu Security Notices
  2. USN-5379-1

USN-5379-1: klibc vulnerabilities

Publication date

18 April 2022

Overview

Several security issues were fixed in klibc.

Releases

Packages

  • klibc - small utilities built with klibc for early boot

Details

It was discovered that klibc did not properly perform
some mathematical operations, leading to an integer overflow.
An attacker could possibly use this issue to cause a crash,
resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-31870)

It was discovered that klibc did not properly handled some
memory allocations on 64 bit systems. An attacker could
possibly use this issue to cause a crash, resulting in a
denial of service, or possibly execute arbitrary code.
(CVE-2021-31871)

It was discovered that klibc did not properly handled some file
sizes values on 32 bit systems. An attacker could possibly use
this issue to cause a crash, resulting in a denial of service,
or possibly execute arbitrary code. (CVE-2021-31872)

It was discovered that klibc did not properly handled...

It was discovered that klibc did not properly perform
some mathematical operations, leading to an integer overflow.
An attacker could possibly use this issue to cause a crash,
resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-31870)

It was discovered that klibc did not properly handled some
memory allocations on 64 bit systems. An attacker could
possibly use this issue to cause a crash, resulting in a
denial of service, or possibly execute arbitrary code.
(CVE-2021-31871)

It was discovered that klibc did not properly handled some file
sizes values on 32 bit systems. An attacker could possibly use
this issue to cause a crash, resulting in a denial of service,
or possibly execute arbitrary code. (CVE-2021-31872)

It was discovered that klibc did not properly handled some
memory allocations. An attacker could possibly use this issue
to cause a crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2021-31873)

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
20.04 focal klibc-utils –  2.0.7-1ubuntu5.1
libklibc –  2.0.7-1ubuntu5.1
18.04 bionic klibc-utils –  2.0.4-9ubuntu2.1
libklibc –  2.0.4-9ubuntu2.1
16.04 xenial klibc-utils –  2.0.4-8ubuntu1.16.04.4+esm1  
libklibc –  2.0.4-8ubuntu1.16.04.4+esm1  
14.04 trusty klibc-utils –  2.0.3-0ubuntu1.14.04.3+esm2  
libklibc –  2.0.3-0ubuntu1.14.04.3+esm2  

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›