192 matches found
Do Not Start the debug-shell Service
The debug-shell service is used to locate faults that occur during system boot. This service is installed with systemd. The debug-shell service requires no authentication, that is, attackers can access the root shell by simply pressing Ctrl+Alt+F9 during systemd startup when the OS is booting. Th...
Do Not Enable Login Capabilities for Users Who Are Not Meant for Direct Login
Typically, a Linux system has multiple users, not all of which are used for login. For instance, some users are automatically created during the installation of software packages like systemd and dhcp. These users serve specific purposes, such as running related software services. It is essential...
Configure Audit Rules for SELinux
SELinux is a mandatory access control function component of Linux. It is used to implement fine-grained permission control on processes and files. You are advised to audit configurations of SELinux configuration files and policy files and record modification logs. If SELinux audit is not...
Ensure That auditd Is Enabled
The auditd component is a user-space component of the Linux audit framework, providing the auditctl, ausearch, and aureport programs to audit and view logs. Audit rules are configured using the auditctl program. When getting started, auditctl reads these rules from /etc/audit/audit.rules. The aud...
Configure Proper MACs Algorithms for the SSH Service
In cryptography, a message authentication code MAC is an authentication mechanism used by communication entities to check message integrity. If the configured algorithms are insecure, security risks increase because weak algorithms have been or are about to be cracked in the industry. The...
Do Not Use auditctl to Set auditd Rules
auditd service rules can be configured using either rule files in the /etc/audit/rules.d/ directory applied after server restart or the auditctl command for immediate effect. The permission of the /etc/audit/rules.d/ directory is 750, while that of the auditctl command is 755. Therefore,...
Do Not Allow Non-root Users with UID 0
The user with UID 0 is the super administrator user in the Linux system. By convention, the user name is root. The UID of a non-root user cannot be 0. If the UID of the root user is changed to another value and the UID of another user for example, the test user is changed to 0, the test user is...
Configure a Proper SSH Service Authentication Mode
A proper authentication mode helps ensure user and system data security. Typically, the user/password authentication mode is suitable for human-machine users. In non-interactive login scenarios, the public and private keys are suitable for authentication. In high-risk scenarios, only the public a...
Configure Proper Key Algorithms for User Authentication
If the public and private key authentication mode is used, the public and private key algorithms on the client must be restricted to avoid using insecure algorithms that have been phased out in the industry. The recommended security algorithms are sorted by priority as follows. The algorithms hav...
Ensure That the su Command Inherits the User Environment Variables Without Escalating Privileges
The su command enables a common user to have the permissions of the superuser or other users. It is often used for switching the user from a common user to the root user. The su command provides a convenient way for users to change their identities. However, if the su command is run without...
Configure Session Audit Rules
You are advised to audit and monitor the /var/run/utmp, /var/log/wtmp, and /var/log/btmp files. /var/run/utmp records all login events, /var/log/wtmp records all login, logout, shutdown, and restart events, and /var/log/btmp records login failure events. If session audit is not configured,...
Ensure That the Drive Space Threshold Is Correct
If the drive space is fully occupied by auditd logs, services may fail to be executed. Therefore, set related configuration items in advance to prevent serious system issues caused by low drive space. The following items in the /etc/audit/auditd.conf file have been configured with default values ...
Configure the Core Dump Properly
A core dump records the memory status when a program stops abnormally or breaks down. It helps locate faults but may contain sensitive information in the process memory. In some cases, the core dump function needs to be enabled to record problem causes. When enabling the core dump function,...
Azure Linux 3.0 Security Update: giflib (CVE-2025-31344)
The version of giflib installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-31344 advisory. - Heap-based Buffer Overflow vulnerability in openEuler giflib on Linux. This vulnerability is associated with...
ALPINE-CVE-2025-31344
Heap-based Buffer Overflow vulnerability in openEuler giflib on Linux. This vulnerability is associated with program files gif2rgb.C. This issue affects giflib: through 5.2.2...
CVE-2025-31344
Heap-based Buffer Overflow vulnerability in openEuler giflib on Linux. This vulnerability is associated with program files gif2rgb.C. This issue affects giflib: through 5.2.2...
AZL-60246 CVE-2025-31344 affecting package giflib for versions less than 5.2.1-9
Heap-based Buffer Overflow vulnerability in openEuler giflib on Linux. This vulnerability is associated with program files gif2rgb.C. This issue affects giflib: through 5.2.2...
CVE-2025-31344
Heap-based Buffer Overflow vulnerability in openEuler giflib on Linux. This vulnerability is associated with program files gif2rgb.C. This issue affects giflib: through 5.2.2...
AZL-60261 CVE-2025-31344 affecting package giflib for versions less than 5.2.1-10
Heap-based Buffer Overflow vulnerability in openEuler giflib on Linux. This vulnerability is associated with program files gif2rgb.C. This issue affects giflib: through 5.2.2...
UBUNTU-CVE-2025-31344
Heap-based Buffer Overflow vulnerability in openEuler giflib on Linux. This vulnerability is associated with program files gif2rgb.C. This issue affects giflib: through 5.2.2...