RHSA-2021:3477 - Security Advisory

Topic

An update for redhat-release-virtualization-host and redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. 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.

Description

The redhat-virtualization-host packages provide the Red Hat Virtualization Host.
These packages include redhat-release-virtualization-host. Red Hat
Virtualization Hosts (RHVH) are installed using a special build of Red Hat
Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and
performing administrative tasks.

Security Fix(es):

• sssd: shell command injection in sssctl (CVE-2021-3621)
• kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715)
• kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)
• libX11: missing request length checks (CVE-2021-31535)
• kernel: race condition for removal of the HCI controller (CVE-2021-32399)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/2974891

Affected Products

• Red Hat Virtualization 4 for RHEL 7 x86_64
• Red Hat Virtualization Host 4 for RHEL 7 x86_64

Fixes

• BZ - 1961822 - CVE-2021-31535 libX11: missing request length checks
• BZ - 1970807 - CVE-2021-32399 kernel: race condition for removal of the HCI controller
• BZ - 1975142 - CVE-2021-3621 sssd: shell command injection in sssctl
• BZ - 1980101 - CVE-2021-22555 kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c
• BZ - 1993988 - CVE-2021-3715 kernel: use-after-free in route4_change() in net/sched/cls_route.c

CVEs

• CVE-2021-3621
• CVE-2021-3715
• CVE-2021-22555
• CVE-2021-31535
• CVE-2021-32399

References

• https://access.redhat.com/security/updates/classification/#important