[Ksplice][Ubuntu-22.04-Updates] New Ksplice updates for Ubuntu 22.04 Jammy (USN-6446-1)

[Oracle Ksplice]

Synopsis: USN-6446-1 can now be patched using Ksplice
CVEs: CVE-2023-34319 CVE-2023-4244 CVE-2023-42752 CVE-2023-42753 CVE-2023-42755 CVE-2023-42756 CVE-2023-4622 CVE-2023-4623 CVE-2023-4881 CVE-2023-4911 CVE-2023-4921 CVE-2023-5197

Systems running Ubuntu 22.04 Jammy can now use Ksplice to patch
against the latest Ubuntu Security Notice, USN-6446-1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Ubuntu 22.04
Jammy install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* CVE-2023-4911: Buffer overflow in the GNU C Library's dynamic loader while processing environment variables.

Incorrect processing of environment variables in the GNU C Library's
dynamic loader ld.so can result in buffer overflow. This flaw could
allow a local attacker to elevate their privileges when launching
binaries with SUID permission.


* CVE-2023-4881: Out-of-bounds access in Netfilter nf_tables exthdr subsystem.

Incorrect logic in the Netfilter nf_tables exthdr subsystem can lead to
out-of-bounds stack write.  This can potentially lead to stack corruption and
denial-of-service or information disclosure.


* CVE-2023-42753: Privilege escalation in the netfilter subsystem.

A logic error when calculating an array offset in the netfilter
subsystem could lead to an out-of-bounds access. A local attacker could
use this flaw to escalate privileges or to cause a denial-of-service.


* CVE-2023-4622: Use-after-free when sending data through Unix sockets.

A locking error when sending data through a Unix sockets that is
concurrently being pruned from garbage collected file descriptors could
lead to a use-after-free.  A local, unprivileged user could use this flaw
to cause a denial-of-service or escalate its privileges.


* CVE-2023-34319, XSA-432: Buffer overflow in Xen netback driver.

Incorrect logic in the Xen netback driver while handling packets can lead to a
buffer overflow. An unprivileged guest can cause denial-of-service of the host
network.


* CVE-2023-5197: Use-after-free in the netfilter subsystem.

A flaw in nf_tables when adding and removing of rules from chain bindings
within the same transaction may lead to a use-after-free. A local user
could use this flaw for privilege escalation.


* CVE-2023-42756: Denial-of-service in the netfilter subsystem.

A race condition in netfilter between IPSET_CMD_ADD and IPSET_CMD_SWAP
can lead to a kernel panic. A local user could use this flaw to cause a
denial-of-service.


* CVE-2023-42752: Out-of-bounds memory access in TCP/IP networking.

Insufficient checks for integer overflow when allocating a socket buffer
could lead to an out-of-bounds memory write. A local user could use this
flaw for arbitrary code execution.


* Note: Oracle will not provide a zero-downtime update for CVE-2023-4244.

A race condition in the set implementation of nftables between
the control plane and the garbage collection worker could lead to a
use-after-free. A local user with CAP_NET_ADMIN access could use this
flaw to cause a crash or expose sensitive kernel information.

Oracle has determined that patching CVE-2023-4244 on a running system
would not be safe and recommends a reboot.

On workloads that permit it, a temporary mitigation is to disallow
unprivileged users from creating namespaces:

sudo sysctl -w kernel.unprivileged_userns_clone=0


* CVE-2023-4921: Use-after-free in QFQ packet scheduler.

The Quick Fair Queueing packet scheduling algorithm did not properly handle
network packets in some situations, leading to a use-after-free. A local
user could use this flaw to cause a denial-of-service or potentially
execute arbitrary code.


* CVE-2023-4623: Use-after-free in HFSC packet scheduler.

The Hierarchical Fair Service Curve packet scheduling algorithm did not
validate inner classes, leading to a possible use-after-free. A local
user could use this flaw to cause a denial-of-service or potentially
execute arbitrary code.


* CVE-2023-42755: Out-of-bounds memory access in IPv4 Resource Reservation Protocol classifier.

A flaw in the RSVP classifier may lead to an out-of-bounds memory read.
A local user could use this flaw to cause a denial-of-service. Note that
this update prevents the cls_rsvp and cls_rsvp6 modules from being loaded.


* Improved fix for CVE-2023-4911: Buffer overflow in the GNU C Library's dynamic loader while processing environment variables.

Incorrect processing of environment variables in the GNU C Library's
dynamic loader ld.so can result in buffer overflow. This flaw could
allow a local attacker to elevate their privileges when launching
binaries with SUID permission.

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.