[USN-3758-2] libx11 vulnerabilities


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Ubuntu Security Notice USN-3758-2
August 30, 2018

libx11 vulnerabilities
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in libx11.

Software Description:
– libx11: X11 client-side library

Details:

USN-3758-1 fixed several vulnerabilities in libx11. This update
provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

=C2=A0Tobias Stoeckmann discovered that libx11 incorrectly handled certain
=C2=A0images. An attacker could possibly use this issue to access sensitive
=C2=A0information (CVE-2016-7942)

=C2=A0Tobias Stoeckmann discovered that libx11 incorrectly handled certain
=C2=A0inputs. An attacker could possibly use this issue to access sensitive
=C2=A0information. (CVE-2016-7943)

=C2=A0It was discovered that libx11 incorrectly handled certain inputs.
=C2=A0An attacker could possibly use this issue to cause a denial of
=C2=A0service. (CVE-2018-14598, CVE-2018-14599, CVE-2018-14600)

Update instructions:

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

Ubuntu 12.04 ESM:
=C2=A0 libx11-6=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A02:1.4.99.1-0ubuntu2.4
=C2=A0 libx11-dev=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
2:1.4.99.1-0ubuntu2.4

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

References:
=C2=A0 https://usn.ubuntu.com/usn/usn-3758-2
=C2=A0 https://usn.ubuntu.com/usn/usn-3758-1
=C2=A0 CVE-2016-7942, CVE-2016-7943, CVE-2018-14598, CVE-2018-14599,
=C2=A0 CVE-2018-14600
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