Amazon Linux AMI update for kernel



Risk Medium
Patch available YES
Number of vulnerabilities 12
CVE-ID CVE-2020-16119
CVE-2021-22543
CVE-2021-3609
CVE-2021-3655
CVE-2021-3679
CVE-2021-3732
CVE-2021-3753
CVE-2021-37576
CVE-2021-38198
CVE-2021-38204
CVE-2021-38205
CVE-2021-40490
CWE-ID CWE-416
CWE-119
CWE-362
CWE-909
CWE-400
CWE-264
CWE-125
CWE-787
CWE-732
CWE-824
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Public exploit code for vulnerability #3 is available.
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

kernel
Operating systems & Components / Operating system package or component

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains information about 12 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU68424

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-2020-16119

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 caused by the reuse of a DCCP socket with an attached dccps_hc_tx_ccid object as a listener. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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.

2) Buffer overflow

EUVDB-ID: #VU56018

Risk: Low

CVSSv4.0: 7.1 [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:P/U:Clear]

CVE-ID: CVE-2021-22543

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error in Linux kernel when handling VM_IO|VM_PFNMAP vmas in KVM. A local user can  can bypass RO checks and cause the pages to get freed while still accessible by the VMM and guest. As a result, an attacker with the ability to start and control a VM to read/write random pages of memory, can trigger memory corruption and execute arbitrary code with elevated privileges.


Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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. However, proof of concept for this vulnerability is available.

3) Race condition

EUVDB-ID: #VU54292

Risk: Medium

CVSSv4.0: 7.1 [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:P/U:Green]

CVE-ID: CVE-2021-3609

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition in the CAN BCM networking protocol (net/can/bcm.c) in the Linux kernel ranging from version 2.6.25 to mainline 5.13-rc6. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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. However, proof of concept for this vulnerability is available.

4) Missing initialization of resource

EUVDB-ID: #VU61098

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3655

CWE-ID: CWE-909 - Missing initialization of resource

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to missing initialization of resource in the Linux kernel when processing inbound SCTP packets. A remote attacker can send specially crafted SCTP packets to the system and force the kernel to read uninitialized memory.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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.

5) Resource exhaustion

EUVDB-ID: #VU63664

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3679

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to lack of CPU resource in the Linux kernel tracing module functionality when using trace ring buffer in a specific way. A privileged local user (with CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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.

6) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU74548

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3732

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists in the way the user mounts the TmpFS filesystem with OverlayFS. A local user can gain access to hidden files that should not be accessible.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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.

7) Out-of-bounds read

EUVDB-ID: #VU64210

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3753

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel. A local user can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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.

8) Out-of-bounds write

EUVDB-ID: #VU57101

Risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-37576

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in arch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform. An attacker on KVM guest OS can cause host OS memory corruption via rtas_args.nargs and execute arbitrary code on the host OS.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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

9) Incorrect permission assignment for critical resource

EUVDB-ID: #VU63665

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-38198

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to arch/x86/kvm/mmu/paging_tmpl.h incorrectly computes the access permissions of a shadow page. A local user can trigger an error to perform a denial of service attack.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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.

10) Use-after-free

EUVDB-ID: #VU63666

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-38204

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local attacker to perform a denial of service attack.

The vulnerability exists due to a use-after-free error in the drivers/usb/host/max3421-hcd.c in the Linux kernel. An attacker with physical access to the system can remove a MAX-3421 USB device to perform a denial of service attack.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.html


Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

11) Access of uninitialized pointer

EUVDB-ID: #VU92755

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-38205

CWE-ID: CWE-824 - Access of Uninitialized Pointer

Exploit availability: No

Description

The vulnerability allows a local user to manipulate data.

drivers/net/ethernet/xilinx/xilinx_emaclite.c in the Linux kernel before 5.13.3 makes it easier for attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM pointer).

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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.

12) Race condition

EUVDB-ID: #VU63667

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-2021-40490

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition in ext4_write_inline_data_end in fs/ext4/inline.c in the ext4 subsystem in the Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation

Update the affected packages:

i686:
    perf-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.i686
    kernel-4.14.248-129.473.amzn1.i686
    kernel-tools-4.14.248-129.473.amzn1.i686
    perf-4.14.248-129.473.amzn1.i686
    kernel-tools-devel-4.14.248-129.473.amzn1.i686
    kernel-devel-4.14.248-129.473.amzn1.i686
    kernel-debuginfo-common-i686-4.14.248-129.473.amzn1.i686
    kernel-headers-4.14.248-129.473.amzn1.i686

src:
    kernel-4.14.248-129.473.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.248-129.473.amzn1.x86_64
    kernel-tools-devel-4.14.248-129.473.amzn1.x86_64
    kernel-4.14.248-129.473.amzn1.x86_64
    perf-4.14.248-129.473.amzn1.x86_64
    kernel-headers-4.14.248-129.473.amzn1.x86_64
    kernel-tools-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-tools-4.14.248-129.473.amzn1.x86_64
    perf-debuginfo-4.14.248-129.473.amzn1.x86_64
    kernel-devel-4.14.248-129.473.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

kernel: before 4.14.248-129.473

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2021-1539.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.



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