Amazon Linux 2 : kernel (ALAS-2022-1852)

high Nessus Plugin ID 165990

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of kernel installed on the remote host is prior to 4.14.294-220.533. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2022-1852 advisory.

- When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds. (CVE-2021-33655)

- A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures.
Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel. (CVE-2021-4159)

- An out-of-bounds read flaw was found in the Linux kernel's TeleTYpe subsystem. The issue occurs in how a user triggers a race condition using ioctls TIOCSPTLCK and TIOCGPTPEER and TIOCSTI and TCXONC with leakage of memory in the flush_to_ldisc function. This flaw allows a local user to crash the system or read unauthorized random data from memory. (CVE-2022-1462)

- A use-after-free flaw was found in the Linux kernel's Atheros wireless adapter driver in the way a user forces the ath9k_htc_wait_for_target function to fail with some input messages. This flaw allows a local user to crash or potentially escalate their privileges on the system. (CVE-2022-1679)

- A flaw was found in the Linux kernel's KVM when attempting to set a SynIC IRQ. This issue makes it possible for a misbehaving VMM to write to SYNIC/STIMER MSRs, causing a NULL pointer dereference. This flaw allows an unprivileged local attacker on the host to issue specific ioctl calls, causing a kernel oops condition that results in a denial of service. (CVE-2022-2153)

- An issue was found in the Linux kernel in nf_conntrack_irc where the message handling can be confused and incorrectly matches the message. A firewall may be able to be bypassed when users are using unencrypted IRC with nf_conntrack_irc configured. (CVE-2022-2663)

- A race condition was found in the Linux kernel's IP framework for transforming packets (XFRM subsystem) when multiple calls to xfrm_probe_algs occurred simultaneously. This flaw could allow a local attacker to potentially trigger an out-of-bounds write or leak kernel heap memory by performing an out-of-bounds read and copying it into a socket. (CVE-2022-3028)

- The Linux kernel before 5.18.13 lacks a certain clear operation for the block starting symbol (.bss). This allows Xen PV guest OS users to cause a denial of service or gain privileges. (CVE-2022-36123)

- An issue was discovered in the Linux kernel through 5.18.14. xfrm_expand_policies in net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice. (CVE-2022-36879)

- nfqnl_mangle in net/netfilter/nfnetlink_queue.c in the Linux kernel through 5.18.14 allows remote attackers to cause a denial of service (panic) because, in the case of an nf_queue verdict with a one-byte nfta_payload attribute, an skb_pull can encounter a negative skb->len. (CVE-2022-36946)

- An issue was discovered in the Linux kernel through 5.19.8. drivers/firmware/efi/capsule-loader.c has a race condition with a resultant use-after-free. (CVE-2022-40307)

- kernel: a use-after-free in cls_route filter implementation may lead to privilege escalation (CVE-2022-2588)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update kernel' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2022-1852.html

https://alas.aws.amazon.com/cve/html/CVE-2021-4159.html

https://alas.aws.amazon.com/cve/html/CVE-2021-33655.html

https://alas.aws.amazon.com/cve/html/CVE-2022-1462.html

https://alas.aws.amazon.com/cve/html/CVE-2022-1679.html

https://alas.aws.amazon.com/cve/html/CVE-2022-2153.html

https://alas.aws.amazon.com/cve/html/CVE-2022-2588.html

https://alas.aws.amazon.com/cve/html/CVE-2022-2663.html

https://alas.aws.amazon.com/cve/html/CVE-2022-3028.html

https://alas.aws.amazon.com/cve/html/CVE-2022-36123.html

https://alas.aws.amazon.com/cve/html/CVE-2022-36879.html

https://alas.aws.amazon.com/cve/html/CVE-2022-36946.html

https://alas.aws.amazon.com/cve/html/CVE-2022-39188.html

https://alas.aws.amazon.com/cve/html/CVE-2022-40307.html

https://alas.aws.amazon.com/cve/html/CVE-2023-2860.html

https://alas.aws.amazon.com/faqs.html

Plugin Details

Severity: High

ID: 165990

File Name: al2_ALAS-2022-1852.nasl

Version: 1.6

Type: local

Agent: unix

Published: 10/10/2022

Updated: 10/17/2023

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2022-1679

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

CVSS Score Source: CVE-2022-36123

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:kernel-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:kernel-headers, p-cpe:/a:amazon:linux:kernel-livepatch-4.14.294-220.533, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:kernel-tools-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:perf, p-cpe:/a:amazon:linux:perf-debuginfo, p-cpe:/a:amazon:linux:python-perf, p-cpe:/a:amazon:linux:python-perf-debuginfo, cpe:/o:amazon:linux:2

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/30/2022

Vulnerability Publication Date: 5/6/2022

Exploitable With

Core Impact

Reference Information

CVE: CVE-2021-33655, CVE-2021-4159, CVE-2022-1462, CVE-2022-1679, CVE-2022-2153, CVE-2022-2588, CVE-2022-2663, CVE-2022-3028, CVE-2022-36123, CVE-2022-36879, CVE-2022-36946, CVE-2022-39188, CVE-2022-40307, CVE-2023-2860