Amazon Linux AMI update for kernel

1) Reachable Assertion

EUVDB-ID: #VU76392

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-2156

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion when handling IPv6 RPL protocol. A remote attacker can send specially crafted packets to the system and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

aarch64:
    kernel-libbpf-static-6.1.34-56.100.amzn2023.aarch64
    bpftool-6.1.34-56.100.amzn2023.aarch64
    python3-perf-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-6.1.34-56.100.amzn2023.aarch64
    bpftool-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-headers-6.1.34-56.100.amzn2023.aarch64
    kernel-libbpf-6.1.34-56.100.amzn2023.aarch64
    kernel-livepatch-6.1.34-56.100-1.0-0.amzn2023.aarch64
    python3-perf-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-devel-6.1.34-56.100.amzn2023.aarch64
    perf-debuginfo-6.1.34-56.100.amzn2023.aarch64
    perf-6.1.34-56.100.amzn2023.aarch64
    kernel-libbpf-devel-6.1.34-56.100.amzn2023.aarch64
    kernel-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-6.1.34-56.100.amzn2023.aarch64
    kernel-debuginfo-common-aarch64-6.1.34-56.100.amzn2023.aarch64
    kernel-devel-6.1.34-56.100.amzn2023.aarch64

src:
    kernel-6.1.34-56.100.amzn2023.src

x86_64:
    kernel-livepatch-6.1.34-56.100-1.0-0.amzn2023.x86_64
    kernel-tools-devel-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-6.1.34-56.100.amzn2023.x86_64
    python3-perf-6.1.34-56.100.amzn2023.x86_64
    bpftool-6.1.34-56.100.amzn2023.x86_64
    kernel-tools-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-static-6.1.34-56.100.amzn2023.x86_64
    python3-perf-debuginfo-6.1.34-56.100.amzn2023.x86_64
    bpftool-debuginfo-6.1.34-56.100.amzn2023.x86_64
    perf-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-devel-6.1.34-56.100.amzn2023.x86_64
    kernel-tools-6.1.34-56.100.amzn2023.x86_64
    perf-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-headers-6.1.34-56.100.amzn2023.x86_64
    kernel-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-6.1.34-56.100.amzn2023.x86_64
    kernel-debuginfo-common-x86_64-6.1.34-56.100.amzn2023.x86_64
    kernel-devel-6.1.34-56.100.amzn2023.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 6.1.34-56.100

CPE2.3

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-228.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Out-of-bounds write

EUVDB-ID: #VU78010

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-3090

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the ipvlan network driver in Linux kernel. A local user can trigger an out-of-bounds write and execute arbitrary code with elevated privileges.

Mitigation

Update the affected packages:

aarch64:
    kernel-libbpf-static-6.1.34-56.100.amzn2023.aarch64
    bpftool-6.1.34-56.100.amzn2023.aarch64
    python3-perf-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-6.1.34-56.100.amzn2023.aarch64
    bpftool-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-headers-6.1.34-56.100.amzn2023.aarch64
    kernel-libbpf-6.1.34-56.100.amzn2023.aarch64
    kernel-livepatch-6.1.34-56.100-1.0-0.amzn2023.aarch64
    python3-perf-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-devel-6.1.34-56.100.amzn2023.aarch64
    perf-debuginfo-6.1.34-56.100.amzn2023.aarch64
    perf-6.1.34-56.100.amzn2023.aarch64
    kernel-libbpf-devel-6.1.34-56.100.amzn2023.aarch64
    kernel-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-6.1.34-56.100.amzn2023.aarch64
    kernel-debuginfo-common-aarch64-6.1.34-56.100.amzn2023.aarch64
    kernel-devel-6.1.34-56.100.amzn2023.aarch64

src:
    kernel-6.1.34-56.100.amzn2023.src

x86_64:
    kernel-livepatch-6.1.34-56.100-1.0-0.amzn2023.x86_64
    kernel-tools-devel-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-6.1.34-56.100.amzn2023.x86_64
    python3-perf-6.1.34-56.100.amzn2023.x86_64
    bpftool-6.1.34-56.100.amzn2023.x86_64
    kernel-tools-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-static-6.1.34-56.100.amzn2023.x86_64
    python3-perf-debuginfo-6.1.34-56.100.amzn2023.x86_64
    bpftool-debuginfo-6.1.34-56.100.amzn2023.x86_64
    perf-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-devel-6.1.34-56.100.amzn2023.x86_64
    kernel-tools-6.1.34-56.100.amzn2023.x86_64
    perf-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-headers-6.1.34-56.100.amzn2023.x86_64
    kernel-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-6.1.34-56.100.amzn2023.x86_64
    kernel-debuginfo-common-x86_64-6.1.34-56.100.amzn2023.x86_64
    kernel-devel-6.1.34-56.100.amzn2023.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 6.1.34-56.100

CPE2.3

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-228.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Use-after-free

EUVDB-ID: #VU79491

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-3567

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the vc_screen() function in vcs_read in drivers/tty/vt/vc_screen.c. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Update the affected packages:

aarch64:
    kernel-libbpf-static-6.1.34-56.100.amzn2023.aarch64
    bpftool-6.1.34-56.100.amzn2023.aarch64
    python3-perf-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-6.1.34-56.100.amzn2023.aarch64
    bpftool-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-headers-6.1.34-56.100.amzn2023.aarch64
    kernel-libbpf-6.1.34-56.100.amzn2023.aarch64
    kernel-livepatch-6.1.34-56.100-1.0-0.amzn2023.aarch64
    python3-perf-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-devel-6.1.34-56.100.amzn2023.aarch64
    perf-debuginfo-6.1.34-56.100.amzn2023.aarch64
    perf-6.1.34-56.100.amzn2023.aarch64
    kernel-libbpf-devel-6.1.34-56.100.amzn2023.aarch64
    kernel-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-6.1.34-56.100.amzn2023.aarch64
    kernel-debuginfo-common-aarch64-6.1.34-56.100.amzn2023.aarch64
    kernel-devel-6.1.34-56.100.amzn2023.aarch64

src:
    kernel-6.1.34-56.100.amzn2023.src

x86_64:
    kernel-livepatch-6.1.34-56.100-1.0-0.amzn2023.x86_64
    kernel-tools-devel-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-6.1.34-56.100.amzn2023.x86_64
    python3-perf-6.1.34-56.100.amzn2023.x86_64
    bpftool-6.1.34-56.100.amzn2023.x86_64
    kernel-tools-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-static-6.1.34-56.100.amzn2023.x86_64
    python3-perf-debuginfo-6.1.34-56.100.amzn2023.x86_64
    bpftool-debuginfo-6.1.34-56.100.amzn2023.x86_64
    perf-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-devel-6.1.34-56.100.amzn2023.x86_64
    kernel-tools-6.1.34-56.100.amzn2023.x86_64
    perf-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-headers-6.1.34-56.100.amzn2023.x86_64
    kernel-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-6.1.34-56.100.amzn2023.x86_64
    kernel-debuginfo-common-x86_64-6.1.34-56.100.amzn2023.x86_64
    kernel-devel-6.1.34-56.100.amzn2023.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 6.1.34-56.100

CPE2.3

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-228.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Out-of-bounds write

EUVDB-ID: #VU77502

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-35788

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the fl_set_geneve_opt() function in net/sched/cls_flower.c in Linux kernel. A local user can trigger an out-of-bounds write and execute arbitrary code with elevated privileges.

Mitigation

Update the affected packages:

aarch64:
    kernel-libbpf-static-6.1.34-56.100.amzn2023.aarch64
    bpftool-6.1.34-56.100.amzn2023.aarch64
    python3-perf-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-6.1.34-56.100.amzn2023.aarch64
    bpftool-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-headers-6.1.34-56.100.amzn2023.aarch64
    kernel-libbpf-6.1.34-56.100.amzn2023.aarch64
    kernel-livepatch-6.1.34-56.100-1.0-0.amzn2023.aarch64
    python3-perf-6.1.34-56.100.amzn2023.aarch64
    kernel-tools-devel-6.1.34-56.100.amzn2023.aarch64
    perf-debuginfo-6.1.34-56.100.amzn2023.aarch64
    perf-6.1.34-56.100.amzn2023.aarch64
    kernel-libbpf-devel-6.1.34-56.100.amzn2023.aarch64
    kernel-debuginfo-6.1.34-56.100.amzn2023.aarch64
    kernel-6.1.34-56.100.amzn2023.aarch64
    kernel-debuginfo-common-aarch64-6.1.34-56.100.amzn2023.aarch64
    kernel-devel-6.1.34-56.100.amzn2023.aarch64

src:
    kernel-6.1.34-56.100.amzn2023.src

x86_64:
    kernel-livepatch-6.1.34-56.100-1.0-0.amzn2023.x86_64
    kernel-tools-devel-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-6.1.34-56.100.amzn2023.x86_64
    python3-perf-6.1.34-56.100.amzn2023.x86_64
    bpftool-6.1.34-56.100.amzn2023.x86_64
    kernel-tools-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-static-6.1.34-56.100.amzn2023.x86_64
    python3-perf-debuginfo-6.1.34-56.100.amzn2023.x86_64
    bpftool-debuginfo-6.1.34-56.100.amzn2023.x86_64
    perf-6.1.34-56.100.amzn2023.x86_64
    kernel-libbpf-devel-6.1.34-56.100.amzn2023.x86_64
    kernel-tools-6.1.34-56.100.amzn2023.x86_64
    perf-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-headers-6.1.34-56.100.amzn2023.x86_64
    kernel-debuginfo-6.1.34-56.100.amzn2023.x86_64
    kernel-6.1.34-56.100.amzn2023.x86_64
    kernel-debuginfo-common-x86_64-6.1.34-56.100.amzn2023.x86_64
    kernel-devel-6.1.34-56.100.amzn2023.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 6.1.34-56.100

CPE2.3

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-228.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Risk	Medium
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2023-2156 CVE-2023-3090 CVE-2023-3567 CVE-2023-35788
CWE-ID	CWE-617 CWE-787 CWE-416
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system kernel Operating systems & Components / Operating system package or component
Vendor	Amazon Web Services