RHSA-2021:3235 - Security Advisory

Topic

An update for imgbased, redhat-release-virtualization-host, and redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 8.

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, ovirt-node, and
rhev-hypervisor. 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):

• edk2: remote buffer overflow in IScsiHexToBin function in NetworkPkg/IScsiDxe ()
• kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
• kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)
• sssd: shell command injection in sssctl (CVE-2021-3621)
• kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• Rebase package(s) to version: 1.2.23

Highlights, important fixes, or notable enhancements:

• imgbase should not copy the selinux binary policy file (BZ# 1979624) (BZ#1989397)
• RHV-H has been rebased on Red Hat Enterprise Linux 8.4 Batch #2. (BZ#1975177)

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 8 x86_64
• Red Hat Virtualization Host 4 for RHEL 8 x86_64

Fixes

• BZ - 1956284 - edk2: remote buffer overflow in IScsiHexToBin function in NetworkPkg/IScsiDxe
• BZ - 1965461 - CVE-2021-22543 kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks
• BZ - 1971651 - CVE-2021-3609 kernel: race condition in net/can/bcm.c leads to local privilege escalation
• BZ - 1975142 - CVE-2021-3621 sssd: shell command injection in sssctl
• BZ - 1975177 - Rebase RHV-H 4.4.7 on RHEL 8.4.0.2
• BZ - 1980101 - CVE-2021-22555 kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c
• BZ - 1989397 - Upgrade imgbased to 1.2.23

CVEs

• CVE-2021-3609
• CVE-2021-3621
• CVE-2021-22543
• CVE-2021-22555
• CVE-2021-38575

References

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