Ubuntu update for LibreOffice

1) Improper access control

EUVDB-ID: #VU20955

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-9854

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to unsafe URL assembly flaw in allowed script location check. A remote authenticated attacker can execute script in arbitrary locations on the filesystem by employing a URL encoding attack to defeat the path verification step.

Mitigation

Update the affected packages.

Ubuntu 19.04

libreoffice-core - 1:6.2.7-0ubuntu0.19.04.1

Ubuntu 18.04 LTS

libreoffice-core - 1:6.0.7-0ubuntu0.18.04.10

Ubuntu 16.04 LTS

libreoffice-core - 1:5.1.6~rc2-0ubuntu1~xenial10

Vulnerable software versions

libreoffice (Ubuntu package): 1:5.1.0~beta1-0ubuntu1 - 1:5.1.6~rc2-0ubuntu1~xenial9

CPE2.3

• cpe:2.3:a:canonical:libreoffice_ubuntu_package:1:5.1.0~beta1-0ubuntu1:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libreoffice_ubuntu_package:1:5.1.0~rc1-1:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libreoffice_ubuntu_package:1:5.1.0~alpha1-1:*:*:*:*:ubuntu:*:*

External links

https://usn.ubuntu.com/4138-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.