RedHat: RHSA-2021-1811:01 Moderate: libvncserver security update | ...
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: libvncserver security update
Advisory ID:       RHSA-2021:1811-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1811
Issue date:        2021-05-18
CVE Names:         CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 
                   CVE-2020-14405 CVE-2020-25708 
=====================================================================

1. Summary:

An update for libvncserver is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

3. Description:

LibVNCServer is a C library that enables you to implement VNC server
functionality into own programs.

Security Fix(es):

* libvncserver: uninitialized memory contents are vulnerable to Information
Leak (CVE-2018-21247)

* libvncserver: buffer overflow in ConnectClientToUnixSock()
(CVE-2019-20839)

* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference
(CVE-2020-14397)

* libvncserver: libvncclient/rfbproto.c does not limit TextChat size
(CVE-2020-14405)

* libvncserver: libvncserver/rfbserver.c has a divide by zero which could
result in DoS (CVE-2020-25708)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.4 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock()
1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak
1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size
1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference
1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
libvncserver-0.9.11-17.el8.src.rpm

aarch64:
libvncserver-0.9.11-17.el8.aarch64.rpm
libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm
libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm

ppc64le:
libvncserver-0.9.11-17.el8.ppc64le.rpm
libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm
libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm

s390x:
libvncserver-0.9.11-17.el8.s390x.rpm
libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm
libvncserver-debugsource-0.9.11-17.el8.s390x.rpm

x86_64:
libvncserver-0.9.11-17.el8.i686.rpm
libvncserver-0.9.11-17.el8.x86_64.rpm
libvncserver-debuginfo-0.9.11-17.el8.i686.rpm
libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm
libvncserver-debugsource-0.9.11-17.el8.i686.rpm
libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm

Red Hat CodeReady Linux Builder (v. 8):

aarch64:
libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm
libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm
libvncserver-devel-0.9.11-17.el8.aarch64.rpm

ppc64le:
libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm
libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm
libvncserver-devel-0.9.11-17.el8.ppc64le.rpm

s390x:
libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm
libvncserver-debugsource-0.9.11-17.el8.s390x.rpm
libvncserver-devel-0.9.11-17.el8.s390x.rpm

x86_64:
libvncserver-debuginfo-0.9.11-17.el8.i686.rpm
libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm
libvncserver-debugsource-0.9.11-17.el8.i686.rpm
libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm
libvncserver-devel-0.9.11-17.el8.i686.rpm
libvncserver-devel-0.9.11-17.el8.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-21247
https://access.redhat.com/security/cve/CVE-2019-20839
https://access.redhat.com/security/cve/CVE-2020-14397
https://access.redhat.com/security/cve/CVE-2020-14405
https://access.redhat.com/security/cve/CVE-2020-25708
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/

8. Contact:

The Red Hat security contact is . More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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RedHat: RHSA-2021-1811:01 Moderate: libvncserver security update

An update for libvncserver is now available for Red Hat Enterprise Linux 8

Summary

LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.
Security Fix(es):
* libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)
* libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)
* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)
* libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)
* libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changesdescribed in this advisory, refer to:https://access.redhat.com/articles/11258

References

https://access.redhat.com/security/cve/CVE-2018-21247 https://access.redhat.com/security/cve/CVE-2019-20839 https://access.redhat.com/security/cve/CVE-2020-14397 https://access.redhat.com/security/cve/CVE-2020-14405 https://access.redhat.com/security/cve/CVE-2020-25708 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/

Package List

Red Hat Enterprise Linux AppStream (v. 8):
Source: libvncserver-0.9.11-17.el8.src.rpm
aarch64: libvncserver-0.9.11-17.el8.aarch64.rpm libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-0.9.11-17.el8.ppc64le.rpm libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-0.9.11-17.el8.s390x.rpm libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-0.9.11-17.el8.i686.rpm libvncserver-0.9.11-17.el8.x86_64.rpm libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm
Red Hat CodeReady Linux Builder (v. 8):
aarch64: libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm libvncserver-devel-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm libvncserver-devel-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm libvncserver-devel-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm libvncserver-devel-0.9.11-17.el8.i686.rpm libvncserver-devel-0.9.11-17.el8.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/

Severity
Advisory ID: RHSA-2021:1811-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:1811
Issued Date: : 2021-05-18
CVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 CVE-2020-14405 CVE-2020-25708

Topic

An update for libvncserver is now available for Red Hat Enterprise Linux 8.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Relevant Releases Architectures

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock()

1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak

1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size

1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference

1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS

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