ESB-2019.0298 - [Ubuntu] libvncclient1: Multiple vulnerabilities 2019-02-01

Printable version
PGP/GPG verifiable version

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0298
                       LibVNCServer vulnerabilities
                              1 February 2019

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libvncclient1
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-20750 CVE-2018-20749 CVE-2018-20748
                   CVE-2018-20024 CVE-2018-20023 CVE-2018-20022
                   CVE-2018-20021 CVE-2018-20020 CVE-2018-20019
                   CVE-2018-15127 CVE-2018-15126 CVE-2018-6307

Reference:         ESB-2019.0295
                   ESB-2019.0123
                   ESB-2019.0121
                   ESB-2019.0114
                   ESB-2019.0009

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3877-1

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-3877-1: LibVNCServer vulnerabilities

31 January 2019
libvncserver vulnerabilities

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

    Ubuntu 18.10
    Ubuntu 18.04 LTS
    Ubuntu 16.04 LTS
    Ubuntu 14.04 LTS

Summary

Several security issues were fixed in LibVNCServer.

Software Description

    libvncserver - vnc server library

Details

It was discovered that LibVNCServer incorrectly handled certain operations. A
remote attacker able to connect to applications using LibVNCServer could
possibly use this issue to obtain sensitive information, cause a denial of
service, or execute arbitrary code.

Update instructions

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

Ubuntu 18.10
    libvncclient1 - 0.9.11+dfsg-1.1ubuntu0.1
    libvncserver1 - 0.9.11+dfsg-1.1ubuntu0.1
Ubuntu 18.04 LTS
    libvncclient1 - 0.9.11+dfsg-1ubuntu1.1
    libvncserver1 - 0.9.11+dfsg-1ubuntu1.1
Ubuntu 16.04 LTS
    libvncclient1 - 0.9.10+dfsg-3ubuntu0.16.04.3
    libvncserver1 - 0.9.10+dfsg-3ubuntu0.16.04.3
Ubuntu 14.04 LTS
    libvncserver0 - 0.9.9+dfsg-1ubuntu1.4

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

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

References

    CVE-2018-15126
    CVE-2018-15127
    CVE-2018-20019
    CVE-2018-20020
    CVE-2018-20021
    CVE-2018-20022
    CVE-2018-20023
    CVE-2018-20024
    CVE-2018-20748
    CVE-2018-20749
    CVE-2018-20750
    CVE-2018-6307

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQIVAwUBXFOUbWaOgq3Tt24GAQiluw//SFFtspLrOOTIevumfnZuwkl5/wvpeBm5
/KqQNBTfN42hb53KdF4NplEqO1KC3jpygfgLGhh16IzRghelqDKo1AkmKodA+SxD
+wmVRUT4y12+O5ZevOSNVuf061lTm1mZ+DodzKPU70iJqZFmnvUlKyHA+aSLJt3u
u8xMWc9yGxj2HvGQ2Fj+T6OGT82p7EtRiWfoaZ5qhTjAD6O8v19tYtIlXIW9iG6F
2SLR/6Ovpm0jj6ip9XI/RhaaWt2zffwwWvXPlWIxkSiArFZKXUNENwjwURou+3jI
5TWiPCZkiYmF+XIoZRMShAHPcO86aOkcpAqs5UPGVJ9l6U89XORzLblW8u3uEac6
quBFVdh38/GmhryWKrQISRQ/qmEkIiNtxHXKTXakc4A0ngAwkCLAopQpKTR+jtia
J+l/IdIWQPMAHrG4Tl4mloVWx1763m3U8wiu0L1zvR8eudWLpTGUoVJXqVu9NOIe
uL0I7bOoRyTslwJt9alBg/zZGv0sZIyD4QaiCyh4sWUVeQ/u2p4Vx6XcR1SeFlFq
XadCKLgtBRXVfk8gY/QvDx0zs2DnzBKvN0sEvsycIEyLrV1k2X93KC1Ow3rJJU7E
6zw73pymjASNE9Q7U5ETLY6tsTrvk/cSbIkPBp3Xit+NG5mT0TR44L2x5Mn9N8PV
uqU+dbfnqyA=
=Z5he
-----END PGP SIGNATURE-----

« Back to bulletins