tigervnc security update

CentOS Errata and Security Advisory CESA-2020:3875

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.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-cr-announce/2020-October/032922.html

Affected packages:
tigervnc
tigervnc-icons
tigervnc-license
tigervnc-server
tigervnc-server-applet
tigervnc-server-minimal
tigervnc-server-module

Upstream details at:
https://access.redhat.com/errata/RHSA-2020:3875