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Related Vulnerabilities: CVE-2021-43565 CVE-2022-27191 CVE-2022-27664 CVE-2022-41723

The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an attacker to panic an SSH server. (CVE-2021-43565) A broken cryptographic algorithm flaw was found in golang.org/x/crypto/ssh. This issue causes a client to fail authentification with RSA keys to servers that reject signature algorithms based on SHA-2, enabling an attacker to crash the server, resulting in a loss of availability. (CVE-2022-27191) In net/http in Go before 1.18.6 and 1.19.x before 1.19.1, attackers can cause a denial of service because an HTTP/2 connection can hang during closing if shutdown were preempted by a fatal error. (CVE-2022-27664) http2/hpack: avoid quadratic complexity in hpack decoding (CVE-2022-41723)

Source

ALAS-2023-1825

Amazon Linux AMI Security Advisory: ALAS-2023-1825
Advisory Release Date: 2023-08-30 18:41 Pacific
Advisory Updated Date: 2023-09-09 00:34 Pacific

Severity: Important

References: CVE-2021-43565 CVE-2022-27191 CVE-2022-27664 CVE-2022-41723
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an attacker to panic an SSH server. (CVE-2021-43565)

A broken cryptographic algorithm flaw was found in golang.org/x/crypto/ssh. This issue causes a client to fail authentification with RSA keys to servers that reject signature algorithms based on SHA-2, enabling an attacker to crash the server, resulting in a loss of availability. (CVE-2022-27191)

In net/http in Go before 1.18.6 and 1.19.x before 1.19.1, attackers can cause a denial of service because an HTTP/2 connection can hang during closing if shutdown were preempted by a fatal error. (CVE-2022-27664)

http2/hpack: avoid quadratic complexity in hpack decoding (CVE-2022-41723)

Affected Packages:

amazon-ssm-agent

Issue Correction:
Run yum update amazon-ssm-agent to update your system.

New Packages:

src:
    amazon-ssm-agent-3.2.1377.0-1.amzn1.src

x86_64:
    amazon-ssm-agent-3.2.1377.0-1.amzn1.x86_64
    amazon-ssm-agent-debuginfo-3.2.1377.0-1.amzn1.x86_64

Additional References

Red Hat: CVE-2021-43565, CVE-2022-27191, CVE-2022-27664, CVE-2022-41723

Mitre: CVE-2021-43565, CVE-2022-27191, CVE-2022-27664, CVE-2022-41723

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ALAS-2023-1825

ALAS-2023-1825

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