(RHSA-2021:1811) Moderate: libvncserver security update

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)

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 8.4 Release Notes linked from the References section.