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AlmaLinux OS 9 must not allow users to override SSH environment variables.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-269439ALMA-09-043030SV-269439r1050322_ruleCCI-002420medium
Description
SSH environment options potentially allow users to bypass access restriction in some configurations.
STIGDate
Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide2026-05-22

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (3) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CRY-01Use of Cryptographic Controls
0.50
CRY-01.3Pre/Post Transmission Handling
0.50
DCH-10Media Use
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (35) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(1)Monitoring and Control
1.00
AC-17(2)Protection of Confidentiality and Integrity Using Encryption
1.00
AC-3Access Enforcement
1.00
AU-10(1)Association of Identities
1.00
AU-10(2)Validate Binding of Information Producer Identity
1.00
CM-5(1)Automated Access Enforcement and Audit Records
1.00
CM-6Configuration Settings
1.00
CM-7Least Functionality
1.00
IA-2(8)Access to Accounts — Replay Resistant
1.00
IA-2(9)Network Access to Non-privileged Accounts — Replay Resistant
1.00

+25 more (top 10 by confidence shown)

CCI1 mapping
CCI-002420
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 4 hops (3) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

PR.DS-01
0.50
PR.DS-02
0.50
PR.DS-10
0.50

Details

Check Text (C-269439r1050322_chk)

Verify the SSH daemon prevents users from overriding SSH environment variables with the following command: $ sshd -T | grep permituserenvironment permituserenvironment no If the "PermitUserEnvironment" keyword is set to "yes", or no output is returned, this is a finding.

Fix Text (F-73371r1048694_fix)

To configure the system to prevent users from overriding SSH environment variables, add or modify the following line in "/etc/ssh/sshd_config": PermitUserEnvironment no Alternatively, add the setting to an include file if the line "Include /etc/ssh/sshd_config.d/*.conf" is found at the top of the "/etc/ssh/sshd_config" file: $ echo "PermitUserEnvironment no" > /etc/ssh/sshd_config.d/environment.conf Restart the SSH daemon for the settings to take effect: $ systemctl restart sshd.service