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====================================================================                   
Red Hat Security Advisory

Synopsis:          Moderate: tigervnc security and bug fix update
Advisory ID:       RHSA-2023:2830-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2023:2830
Issue date:        2023-05-16
CVE Names:         CVE-2022-4283 CVE-2022-46340 CVE-2022-46341
                   CVE-2022-46342 CVE-2022-46343 CVE-2022-46344
====================================================================
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):

* xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)

* xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)

* xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)

* xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)

* xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)

* xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)

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 8.8 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/):

1437569 - x0vncserver incorrectly maps keysym from vncclient running german keyboard
2151755 - CVE-2022-46340 xorg-x11-server: XTestSwapFakeInput stack overflow
2151756 - CVE-2022-46341 xorg-x11-server: XIPassiveUngrab out-of-bounds access
2151757 - CVE-2022-46342 xorg-x11-server: XvdiSelectVideoNotify use-after-free
2151758 - CVE-2022-46343 xorg-x11-server: ScreenSaverSetAttributes use-after-free
2151760 - CVE-2022-46344 xorg-x11-server: XIChangeProperty out-of-bounds access
2151761 - CVE-2022-4283 xorg-x11-server: XkbGetKbdByName use-after-free
2164704 - selinux policy will not allow tigervnc-server to start
2169960 - Backport upstream fix for broken keyboard handling

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
tigervnc-1.12.0-15.el8_8.src.rpm

aarch64:
tigervnc-1.12.0-15.el8_8.aarch64.rpm
tigervnc-debuginfo-1.12.0-15.el8_8.aarch64.rpm
tigervnc-debugsource-1.12.0-15.el8_8.aarch64.rpm
tigervnc-server-1.12.0-15.el8_8.aarch64.rpm
tigervnc-server-debuginfo-1.12.0-15.el8_8.aarch64.rpm
tigervnc-server-minimal-1.12.0-15.el8_8.aarch64.rpm
tigervnc-server-minimal-debuginfo-1.12.0-15.el8_8.aarch64.rpm
tigervnc-server-module-1.12.0-15.el8_8.aarch64.rpm
tigervnc-server-module-debuginfo-1.12.0-15.el8_8.aarch64.rpm

noarch:
tigervnc-icons-1.12.0-15.el8_8.noarch.rpm
tigervnc-license-1.12.0-15.el8_8.noarch.rpm
tigervnc-selinux-1.12.0-15.el8_8.noarch.rpm

ppc64le:
tigervnc-1.12.0-15.el8_8.ppc64le.rpm
tigervnc-debuginfo-1.12.0-15.el8_8.ppc64le.rpm
tigervnc-debugsource-1.12.0-15.el8_8.ppc64le.rpm
tigervnc-server-1.12.0-15.el8_8.ppc64le.rpm
tigervnc-server-debuginfo-1.12.0-15.el8_8.ppc64le.rpm
tigervnc-server-minimal-1.12.0-15.el8_8.ppc64le.rpm
tigervnc-server-minimal-debuginfo-1.12.0-15.el8_8.ppc64le.rpm
tigervnc-server-module-1.12.0-15.el8_8.ppc64le.rpm
tigervnc-server-module-debuginfo-1.12.0-15.el8_8.ppc64le.rpm

s390x:
tigervnc-1.12.0-15.el8_8.s390x.rpm
tigervnc-debuginfo-1.12.0-15.el8_8.s390x.rpm
tigervnc-debugsource-1.12.0-15.el8_8.s390x.rpm
tigervnc-server-1.12.0-15.el8_8.s390x.rpm
tigervnc-server-debuginfo-1.12.0-15.el8_8.s390x.rpm
tigervnc-server-minimal-1.12.0-15.el8_8.s390x.rpm
tigervnc-server-minimal-debuginfo-1.12.0-15.el8_8.s390x.rpm
tigervnc-server-module-1.12.0-15.el8_8.s390x.rpm
tigervnc-server-module-debuginfo-1.12.0-15.el8_8.s390x.rpm

x86_64:
tigervnc-1.12.0-15.el8_8.x86_64.rpm
tigervnc-debuginfo-1.12.0-15.el8_8.x86_64.rpm
tigervnc-debugsource-1.12.0-15.el8_8.x86_64.rpm
tigervnc-server-1.12.0-15.el8_8.x86_64.rpm
tigervnc-server-debuginfo-1.12.0-15.el8_8.x86_64.rpm
tigervnc-server-minimal-1.12.0-15.el8_8.x86_64.rpm
tigervnc-server-minimal-debuginfo-1.12.0-15.el8_8.x86_64.rpm
tigervnc-server-module-1.12.0-15.el8_8.x86_64.rpm
tigervnc-server-module-debuginfo-1.12.0-15.el8_8.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-2022-4283
https://access.redhat.com/security/cve/CVE-2022-46340
https://access.redhat.com/security/cve/CVE-2022-46341
https://access.redhat.com/security/cve/CVE-2022-46342
https://access.redhat.com/security/cve/CVE-2022-46343
https://access.redhat.com/security/cve/CVE-2022-46344
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.8_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 2023 Red Hat, Inc.
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