QID 354747

Date Published: 2023-02-28

QID 354747: Amazon Linux Security Advisory for kernel : ALAS-2023-1688

a flaw in the processing of received icmp errors (icmp fragment needed and icmp redirect) in the linux kernel functionality was found to allow the ability to quickly scan open udp ports.
This flaw allows an off-path remote user to effectively bypass the source port udp randomization.
The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on udp source port randomization are indirectly affected as well. (
( CVE-2021-20322) a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28711) a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28712) a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28713) incoming data packets for a guest in the linux kernels netback driver are buffered until the guest is ready to process them.
( CVE-2021-28714) incoming data packets for a guest in the linux kernels netback driver are buffered until the guest is ready to process them.
( CVE-2021-28715) a flaw was found in the linux sctp stack.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

CVSS V3 rated as High - 7.4 severity.

CVSS V2 rated as Medium - 5.8 severity.

Solution

Please refer to Amazon advisory: ALAS-2023-1688 for affected packages and patching details, or update with your package manager.

Vendor References

ALAS-2023-1688 - alas.aws.amazon.com/ALAS-2023-1688.html

CVEs related to QID 354747

CVE-2021-3772 | CVE-2021-28713 | CVE-2021-4155 | CVE-2021-28712 | CVE-2021-28715 | CVE-2021-28714 | CVE-2021-20322 | CVE-2021-4002 | CVE-2021-28711 |

Software Advisories

Advisory ID	Software	Component	Link
ALAS-2023-1688	amazon linux		alas.aws.amazon.com/ALAS-2023-1688.html

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(
    [link] => https://alas.aws.amazon.com/ALAS-2023-1688.html
    [advisory_id] => ALAS-2023-1688
    [os_sw] => amazon linux
    [component] => 
)

Array
(
    [qid] => 354747
    [title] => Amazon Linux Security Advisory for kernel : ALAS-2023-1688
    [severity] => 4
    [description] =>  a flaw in the processing of received icmp errors (icmp fragment needed and icmp redirect) in the linux kernel functionality was found to allow the ability to quickly scan open udp ports.
 This flaw allows an off-path remote user to effectively bypass the source port udp randomization.
 The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on udp source port randomization are indirectly affected as well. (
( CVE-2021-20322) a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28711) a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28712) a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28713) incoming data packets for a guest in the linux kernels netback driver are buffered until the guest is ready to process them.
( CVE-2021-28714) incoming data packets for a guest in the linux kernels netback driver are buffered until the guest is ready to process them.
( CVE-2021-28715) a flaw was found in the linux sctp stack.
 
Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.
    [solution] => Please refer to Amazon advisory: ALAS-2023-1688 for affected packages and patching details, or update with your package manager.
    [consequence] => Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.
    [published] => Yes
    [date_insert] => 2023-02-27
    [date_published] => 2023-02-28
    [cve] => Array
        (
            [0] => CVE-2021-3772
            [1] => CVE-2021-28713
            [2] => CVE-2021-4155
            [3] => CVE-2021-28712
            [4] => CVE-2021-28715
            [5] => CVE-2021-28714
            [6] => CVE-2021-20322
            [7] => CVE-2021-4002
            [8] => CVE-2021-28711
        )

    [vendor_refs] => Array
        (
            [0] => Array
                (
                    [vendor_ref] => ALAS-2023-1688
                    [vendor_ref_url] => https://alas.aws.amazon.com/ALAS-2023-1688.html
                )

        )

    [cvss_v2] => Array
        (
            [basescore] => 5.8
            [temporalscore] => 4.3
        )

    [cvss_v3] => Array
        (
            [basescore] => 7.4
            [temporalscore] => 6.4
        )

    [patches] => Array
        (
            [0] => Array
                (
                    [link] => https://alas.aws.amazon.com/ALAS-2023-1688.html
                    [advisory_id] => ALAS-2023-1688
                    [os_sw] => amazon linux
                    [component] => 
                )

        )

)