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Red Hat: RHSA-2020-1497 Moderate: Tigervnc Remote Access Threat

red hat
Calendar Grey April 16, 2020
Dist Redhat Esm H88
This notification concerns significant security vulnerabilities in tigervnc for Red Hat Enterprise Linux 8. Implement it without delay.

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

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

Summary

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.

Topics%20covered

Topics Covered

security advisory moderate Red Hat update buffer overflow remote access tigervnc

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

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

Read the Full Advisory


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

Topic

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.

Topics%20covered

Topics Covered

security advisory moderate Red Hat update buffer overflow remote access tigervnc

Relevant Releases Architectures

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

Bugs Fixed

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

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