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AUSCERT External Security Bulletin Redistribution
ESB-2020.3356
tigervnc security and bug fix update
30 September 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: tigervnc
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Red Hat Enterprise Linux WS/Desktop 7
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-15695 CVE-2019-15694 CVE-2019-15693
CVE-2019-15692 CVE-2019-15691
Reference: ESB-2020.1356
ESB-2020.0362
ESB-2020.0236
ESB-2020.0176
Original Bulletin:
https://access.redhat.com/errata/RHSA-2020:3875
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Red Hat Security Advisory
Synopsis: Moderate: tigervnc security and bug fix update
Advisory ID: RHSA-2020:3875-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:3875
Issue date: 2020-09-29
CVE Names: CVE-2019-15691 CVE-2019-15692 CVE-2019-15693
CVE-2019-15694 CVE-2019-15695
=====================================================================
1. Summary:
An update for tigervnc is now available for Red Hat Enterprise Linux 7.
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 Enterprise Linux Client (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64
3. Description:
Virtual Network Computing (VNC) is a remote display system which allows
users to view a computing desktop environment not only on the machine where
it is running, but from anywhere on the Internet and from a wide variety of
machine architectures. TigerVNC is a suite of VNC servers and clients.
Security Fix(es):
* tigervnc: Stack use-after-return due to incorrect usage of stack memory
in ZRLEDecoder (CVE-2019-15691)
* tigervnc: Heap buffer overflow triggered from CopyRectDecoder due to
incorrect value checks (CVE-2019-15692)
* tigervnc: Heap buffer overflow in TightDecoder::FilterGradient
(CVE-2019-15693)
* tigervnc: Heap buffer overflow in DecodeManager::decodeRect
(CVE-2019-15694)
* tigervnc: Stack buffer overflow in CMsgReader::readSetCursor
(CVE-2019-15695)
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 7.9 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/):
1789527 - CVE-2019-15692 tigervnc: Heap buffer overflow triggered from CopyRectDecoder due to incorrect value checks
1789908 - CVE-2019-15691 tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder
1790313 - CVE-2019-15693 tigervnc: Heap buffer overflow in TightDecoder::FilterGradient
1790315 - CVE-2019-15694 tigervnc: Heap buffer overflow in DecodeManager::decodeRect
1790318 - CVE-2019-15695 tigervnc: Stack buffer overflow in CMsgReader::readSetCursor
1791996 - TigerVNC should not arbitrarily start on unspecified ports
1826822 - TigerVNC exits at startup
6. Package List:
Red Hat Enterprise Linux Client (v. 7):
Source:
tigervnc-1.8.0-21.el7.src.rpm
noarch:
tigervnc-icons-1.8.0-21.el7.noarch.rpm
tigervnc-license-1.8.0-21.el7.noarch.rpm
x86_64:
tigervnc-1.8.0-21.el7.x86_64.rpm
tigervnc-debuginfo-1.8.0-21.el7.x86_64.rpm
tigervnc-server-1.8.0-21.el7.x86_64.rpm
tigervnc-server-minimal-1.8.0-21.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
noarch:
tigervnc-server-applet-1.8.0-21.el7.noarch.rpm
x86_64:
tigervnc-debuginfo-1.8.0-21.el7.x86_64.rpm
tigervnc-server-module-1.8.0-21.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source:
tigervnc-1.8.0-21.el7.src.rpm
noarch:
tigervnc-license-1.8.0-21.el7.noarch.rpm
x86_64:
tigervnc-debuginfo-1.8.0-21.el7.x86_64.rpm
tigervnc-server-minimal-1.8.0-21.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
noarch:
tigervnc-icons-1.8.0-21.el7.noarch.rpm
tigervnc-server-applet-1.8.0-21.el7.noarch.rpm
x86_64:
tigervnc-1.8.0-21.el7.x86_64.rpm
tigervnc-debuginfo-1.8.0-21.el7.x86_64.rpm
tigervnc-server-1.8.0-21.el7.x86_64.rpm
tigervnc-server-module-1.8.0-21.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source:
tigervnc-1.8.0-21.el7.src.rpm
noarch:
tigervnc-icons-1.8.0-21.el7.noarch.rpm
tigervnc-license-1.8.0-21.el7.noarch.rpm
ppc64:
tigervnc-1.8.0-21.el7.ppc64.rpm
tigervnc-debuginfo-1.8.0-21.el7.ppc64.rpm
tigervnc-server-1.8.0-21.el7.ppc64.rpm
tigervnc-server-minimal-1.8.0-21.el7.ppc64.rpm
ppc64le:
tigervnc-1.8.0-21.el7.ppc64le.rpm
tigervnc-debuginfo-1.8.0-21.el7.ppc64le.rpm
tigervnc-server-1.8.0-21.el7.ppc64le.rpm
tigervnc-server-minimal-1.8.0-21.el7.ppc64le.rpm
s390x:
tigervnc-1.8.0-21.el7.s390x.rpm
tigervnc-debuginfo-1.8.0-21.el7.s390x.rpm
tigervnc-server-1.8.0-21.el7.s390x.rpm
tigervnc-server-minimal-1.8.0-21.el7.s390x.rpm
x86_64:
tigervnc-1.8.0-21.el7.x86_64.rpm
tigervnc-debuginfo-1.8.0-21.el7.x86_64.rpm
tigervnc-server-1.8.0-21.el7.x86_64.rpm
tigervnc-server-minimal-1.8.0-21.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
noarch:
tigervnc-server-applet-1.8.0-21.el7.noarch.rpm
ppc64:
tigervnc-debuginfo-1.8.0-21.el7.ppc64.rpm
tigervnc-server-module-1.8.0-21.el7.ppc64.rpm
ppc64le:
tigervnc-debuginfo-1.8.0-21.el7.ppc64le.rpm
tigervnc-server-module-1.8.0-21.el7.ppc64le.rpm
x86_64:
tigervnc-debuginfo-1.8.0-21.el7.x86_64.rpm
tigervnc-server-module-1.8.0-21.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source:
tigervnc-1.8.0-21.el7.src.rpm
noarch:
tigervnc-icons-1.8.0-21.el7.noarch.rpm
tigervnc-license-1.8.0-21.el7.noarch.rpm
x86_64:
tigervnc-1.8.0-21.el7.x86_64.rpm
tigervnc-debuginfo-1.8.0-21.el7.x86_64.rpm
tigervnc-server-1.8.0-21.el7.x86_64.rpm
tigervnc-server-minimal-1.8.0-21.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 7):
noarch:
tigervnc-server-applet-1.8.0-21.el7.noarch.rpm
x86_64:
tigervnc-debuginfo-1.8.0-21.el7.x86_64.rpm
tigervnc-server-module-1.8.0-21.el7.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-2019-15691
https://access.redhat.com/security/cve/CVE-2019-15692
https://access.redhat.com/security/cve/CVE-2019-15693
https://access.redhat.com/security/cve/CVE-2019-15694
https://access.redhat.com/security/cve/CVE-2019-15695
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.9_release_notes/index
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2020 Red Hat, Inc.
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