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Ubuntu Security Notice USN-4407-1

Ubuntu Security Notice USN-4407-1
Posted Jul 2, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4407-1 - It was discovered that LibVNCServer incorrectly handled decompressing data. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. It was discovered that an information disclosure vulnerability existed in LibVNCServer when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. Various other issues were also addressed.

tags | advisory, denial of service, info disclosure
systems | linux, ubuntu
advisories | CVE-2017-18922, CVE-2019-15680, CVE-2019-15681, CVE-2019-20788
MD5 | ab2befd375e9d3e5fb9cb009d5446e52

Ubuntu Security Notice USN-4407-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4407-1
July 01, 2020

libvncserver vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in LibVNCServer.

Software Description:
- libvncserver: vnc server library

Details:

It was discovered that LibVNCServer incorrectly handled decompressing
data. An
attacker could possibly use this issue to cause LibVNCServer to crash,
resulting in a denial of service. (CVE-2019-15680)

It was discovered that an information disclosure vulnerability existed in
LibVNCServer when sending a ServerCutText message. An attacker could
possibly
use this issue to expose sensitive information. This issue only affected
Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15681)

It was discovered that LibVNCServer incorrectly handled cursor shape
updates.
If a user were tricked in to connecting to a malicious server, an attacker
could possibly use this issue to cause LibVNCServer to crash, resulting in a
denial of service, or possibly execute arbitrary code. This issue only
affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS.
(CVE-2019-15690, CVE-2019-20788)

It was discovered that LibVNCServer incorrectly handled decoding WebSocket
frames. An attacker could possibly use this issue to cause LibVNCServer to
crash, resulting in a denial of service, or possibly execute arbitrary code.
This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu
16.04 LTS.
(CVE-2017-18922)

Update instructions:

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

Ubuntu 20.04 LTS:
libvncclient1 0.9.12+dfsg-9ubuntu0.1
libvncserver1 0.9.12+dfsg-9ubuntu0.1

Ubuntu 19.10:
libvncclient1 0.9.11+dfsg-1.3ubuntu0.1
libvncserver1 0.9.11+dfsg-1.3ubuntu0.1

Ubuntu 18.04 LTS:
libvncclient1 0.9.11+dfsg-1ubuntu1.2
libvncserver1 0.9.11+dfsg-1ubuntu1.2

Ubuntu 16.04 LTS:
libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.4
libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.4

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

References:
https://usn.ubuntu.com/4407-1
CVE-2017-18922, CVE-2019-15680, CVE-2019-15681, CVE-2019-15690,
CVE-2019-20788

Package Information:
https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.1
https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1.3ubuntu0.1
https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.2
https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.4
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