qtbase-opensource-src vulnerabilities

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

* Ubuntu 19.10
* Ubuntu 18.04 LTS
* Ubuntu 16.04 LTS

Summary

Several security issues were fixed in Qt.

Software Description

* qtbase-opensource-src - Qt 5 libraries

Details

It was discovered that Qt incorrectly handled certain PPM images.
If a user or automated system were tricked into opening a
specially crafted PPM file, a remote attacker could cause Qt to
crash, resulting in a denial of service. This issue only affected
Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-19872)

It was discovered that Qt incorrectly handled certain text files.
If a user or automated system were tricked into opening a
specially crafted text file, a remote attacker could cause Qt to
crash, resulting in a denial of service. This issue only affected
Ubuntu 19.10. (CVE-2019-18281)

It was discovered that Qt incorrectly searched for plugins in the
current working directory. An attacker could possibly use this
issue to execute arbitrary code. (CVE-2020-0569)

It was discovered that Qt incorrectly searched for libraries
relative to the current working directory. An attacker could
possibly use this issue to execute arbitrary code. This issue only
affected Ubuntu 19.10. (CVE-2020-0570)

Update instructions

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

Ubuntu 19.10
libqt5core5a - 5.12.4+dfsg-4ubuntu1.1
libqt5gui5 - 5.12.4+dfsg-4ubuntu1.1

Ubuntu 18.04 LTS
libqt5core5a - 5.9.5+dfsg-0ubuntu2.5
libqt5gui5 - 5.9.5+dfsg-0ubuntu2.5

Ubuntu 16.04 LTS
libqt5core5a - 5.5.1+dfsg-16ubuntu7.7
libqt5gui5 - 5.5.1+dfsg-16ubuntu7.7

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart your session to
make all the necessary changes.

References

* CVE-2018-19872
* CVE-2019-18281
* CVE-2020-0569
* CVE-2020-0570

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