A libvncserver security update has been released for Red Hat Enterprise Linux 8.
RHSA-2021:1811-01: Moderate: libvncserver security update
=====================================================================
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
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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.
