QID 239298

Date Published: 2021-05-20

QID 239298: Red Hat Update for libvncserver (RHSA-2021:1811)

LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.

Security Fix(es): libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247) libvncserver: buffer overflow in ConnectClientToUnixSock()
(CVE-2019-20839) libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397) libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405) libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)

Affected Products:

Red Hat Enterprise Linux for x86_64 8 x86_64
Red Hat Enterprise Linux for IBM z Systems 8 s390x
Red Hat Enterprise Linux for Power, little endian 8 ppc64le
Red Hat Enterprise Linux for ARM 64 8 aarch64
Red Hat CodeReady Linux Builder for x86_64 8 x86_64
Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
Red Hat CodeReady Linux Builder for ARM 64 8 aarch64
Red Hat CodeReady Linux Builder for IBM z Systems 8 s390x

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

On successful exploitation, it could allow an attacker to execute code.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution
    Upgrade to the latest packages which contain a patch. Refer to Applying Package Updates to RHEL system for details.

    Refer to Red Hat security advisory RHSA-2021:1811 to address this issue and obtain more information.

    Vendor References

    CVEs related to QID 239298

    CVE-2018-21247 | CVE-2019-20839 | CVE-2020-14397 | CVE-2020-14405 | CVE-2020-25708 |
    Software Advisories
    Advisory ID Software Component Link
    RHSA-2021:1811 Red Hat Enterprise Linux URL Logo access.redhat.com/errata/RHSA-2021:1811?language=en
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