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Red Hat Security Advisory

Synopsis: Moderate: tigervnc security update
Advisory ID: RHSA-2020:1497-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:1497
Issue date: 2020-04-16
CVE Names: CVE-2019-15691 CVE-2019-15692 CVE-2019-15693
CVE-2019-15694 CVE-2019-15695
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1. Summary:

An update for tigervnc 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 Enterprise Linux AppStream (v. 8) – aarch64, noarch, ppc64le, s390x, 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.

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

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
tigervnc-1.9.0-14.el8_1.src.rpm

aarch64:
tigervnc-1.9.0-14.el8_1.aarch64.rpm
tigervnc-debuginfo-1.9.0-14.el8_1.aarch64.rpm
tigervnc-debugsource-1.9.0-14.el8_1.aarch64.rpm
tigervnc-server-1.9.0-14.el8_1.aarch64.rpm
tigervnc-server-debuginfo-1.9.0-14.el8_1.aarch64.rpm
tigervnc-server-minimal-1.9.0-14.el8_1.aarch64.rpm
tigervnc-server-minimal-debuginfo-1.9.0-14.el8_1.aarch64.rpm
tigervnc-server-module-1.9.0-14.el8_1.aarch64.rpm
tigervnc-server-module-debuginfo-1.9.0-14.el8_1.aarch64.rpm

noarch:
tigervnc-icons-1.9.0-14.el8_1.noarch.rpm
tigervnc-license-1.9.0-14.el8_1.noarch.rpm
tigervnc-server-applet-1.9.0-14.el8_1.noarch.rpm

ppc64le:
tigervnc-1.9.0-14.el8_1.ppc64le.rpm
tigervnc-debuginfo-1.9.0-14.el8_1.ppc64le.rpm
tigervnc-debugsource-1.9.0-14.el8_1.ppc64le.rpm
tigervnc-server-1.9.0-14.el8_1.ppc64le.rpm
tigervnc-server-debuginfo-1.9.0-14.el8_1.ppc64le.rpm
tigervnc-server-minimal-1.9.0-14.el8_1.ppc64le.rpm
tigervnc-server-minimal-debuginfo-1.9.0-14.el8_1.ppc64le.rpm
tigervnc-server-module-1.9.0-14.el8_1.ppc64le.rpm
tigervnc-server-module-debuginfo-1.9.0-14.el8_1.ppc64le.rpm

s390x:
tigervnc-1.9.0-14.el8_1.s390x.rpm
tigervnc-debuginfo-1.9.0-14.el8_1.s390x.rpm
tigervnc-debugsource-1.9.0-14.el8_1.s390x.rpm
tigervnc-server-1.9.0-14.el8_1.s390x.rpm
tigervnc-server-debuginfo-1.9.0-14.el8_1.s390x.rpm
tigervnc-server-minimal-1.9.0-14.el8_1.s390x.rpm
tigervnc-server-minimal-debuginfo-1.9.0-14.el8_1.s390x.rpm

x86_64:
tigervnc-1.9.0-14.el8_1.x86_64.rpm
tigervnc-debuginfo-1.9.0-14.el8_1.x86_64.rpm
tigervnc-debugsource-1.9.0-14.el8_1.x86_64.rpm
tigervnc-server-1.9.0-14.el8_1.x86_64.rpm
tigervnc-server-debuginfo-1.9.0-14.el8_1.x86_64.rpm
tigervnc-server-minimal-1.9.0-14.el8_1.x86_64.rpm
tigervnc-server-minimal-debuginfo-1.9.0-14.el8_1.x86_64.rpm
tigervnc-server-module-1.9.0-14.el8_1.x86_64.rpm
tigervnc-server-module-debuginfo-1.9.0-14.el8_1.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

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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