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amazonAmazonALAS2-2022-1748
HistoryFeb 03, 2022 - 7:30 p.m.

Medium: openssh

2022-02-0319:30:00
alas.aws.amazon.com
41
openssh
flaw
local privilege escalation
cve-2021-41617
amazon linux 2
vulnerability

CVSS2

4.4

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:P/I:P/A:P

CVSS3

7

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

7.5

Confidence

High

EPSS

0.001

Percentile

27.7%

JSON

Issue Overview:

A flaw was found in OpenSSH. Helper programs for AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with privileges associated with group memberships of the sshd process, if the configuration specifies running the command as a different user. Depending on system configuration, inherited groups may allow AuthorizedKeysCommand/AuthorizedPrincipalsCommand helper programs to gain unintended privileges, potentially leading to local privilege escalation. (CVE-2021-41617)

Affected Packages:

openssh

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update openssh to update your system.

New Packages:

aarch64:  
    openssh-7.4p1-22.amzn2.0.1.aarch64  
    openssh-clients-7.4p1-22.amzn2.0.1.aarch64  
    openssh-server-7.4p1-22.amzn2.0.1.aarch64  
    openssh-server-sysvinit-7.4p1-22.amzn2.0.1.aarch64  
    openssh-ldap-7.4p1-22.amzn2.0.1.aarch64  
    openssh-keycat-7.4p1-22.amzn2.0.1.aarch64  
    openssh-askpass-7.4p1-22.amzn2.0.1.aarch64  
    openssh-cavs-7.4p1-22.amzn2.0.1.aarch64  
    pam_ssh_agent_auth-0.10.3-2.22.amzn2.0.1.aarch64  
    openssh-debuginfo-7.4p1-22.amzn2.0.1.aarch64  
  
i686:  
    openssh-7.4p1-22.amzn2.0.1.i686  
    openssh-clients-7.4p1-22.amzn2.0.1.i686  
    openssh-server-7.4p1-22.amzn2.0.1.i686  
    openssh-server-sysvinit-7.4p1-22.amzn2.0.1.i686  
    openssh-ldap-7.4p1-22.amzn2.0.1.i686  
    openssh-keycat-7.4p1-22.amzn2.0.1.i686  
    openssh-askpass-7.4p1-22.amzn2.0.1.i686  
    openssh-cavs-7.4p1-22.amzn2.0.1.i686  
    pam_ssh_agent_auth-0.10.3-2.22.amzn2.0.1.i686  
    openssh-debuginfo-7.4p1-22.amzn2.0.1.i686  
  
src:  
    openssh-7.4p1-22.amzn2.0.1.src  
  
x86_64:  
    openssh-7.4p1-22.amzn2.0.1.x86_64  
    openssh-clients-7.4p1-22.amzn2.0.1.x86_64  
    openssh-server-7.4p1-22.amzn2.0.1.x86_64  
    openssh-server-sysvinit-7.4p1-22.amzn2.0.1.x86_64  
    openssh-ldap-7.4p1-22.amzn2.0.1.x86_64  
    openssh-keycat-7.4p1-22.amzn2.0.1.x86_64  
    openssh-askpass-7.4p1-22.amzn2.0.1.x86_64  
    openssh-cavs-7.4p1-22.amzn2.0.1.x86_64  
    pam_ssh_agent_auth-0.10.3-2.22.amzn2.0.1.x86_64  
    openssh-debuginfo-7.4p1-22.amzn2.0.1.x86_64

Additional References

Red Hat: CVE-2021-41617

Mitre: CVE-2021-41617

OSVersionArchitecturePackageVersionFilename
Amazon Linux2aarch64openssh< 7.4p1-22.amzn2.0.1openssh-7.4p1-22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64openssh-clients< 7.4p1-22.amzn2.0.1openssh-clients-7.4p1-22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64openssh-server< 7.4p1-22.amzn2.0.1openssh-server-7.4p1-22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64openssh-server-sysvinit< 7.4p1-22.amzn2.0.1openssh-server-sysvinit-7.4p1-22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64openssh-ldap< 7.4p1-22.amzn2.0.1openssh-ldap-7.4p1-22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64openssh-keycat< 7.4p1-22.amzn2.0.1openssh-keycat-7.4p1-22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64openssh-askpass< 7.4p1-22.amzn2.0.1openssh-askpass-7.4p1-22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64openssh-cavs< 7.4p1-22.amzn2.0.1openssh-cavs-7.4p1-22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64pam_ssh_agent_auth< 0.10.3-2.22.amzn2.0.1pam_ssh_agent_auth-0.10.3-2.22.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64openssh-debuginfo< 7.4p1-22.amzn2.0.1openssh-debuginfo-7.4p1-22.amzn2.0.1.aarch64.rpm
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CVSS2

4.4

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:P/I:P/A:P

CVSS3

7

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

7.5

Confidence

High

EPSS

0.001

Percentile

27.7%

JSON
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