CVE-2023-44201

An Incorrect Permission Assignment for Critical Resource vulnerability in a specific file of Juniper Networks Junos OS and Junos OS Evolved allows a local authenticated attacker to read configuration changes without having the permissions.

When a user with the respective permissions commits a configuration change, a specific file is created. That file is readable even by users with no permissions to access the configuration. This can lead to privilege escalation as the user can read the password hash when a password change is being committed.

This issue affects:

Juniper Networks Junos OS

• All versions prior to 20.4R3-S4;
• 21.1 versions prior to 21.1R3-S4;
• 21.2 versions prior to 21.2R3-S2;
• 21.3 versions prior to 21.3R2-S2, 21.3R3-S1;
• 21.4 versions prior to 21.4R2-S1, 21.4R3.

Juniper Networks Junos OS Evolved

• All versions prior to 20.4R3-S4-EVO;
• 21.1 versions prior to 21.1R3-S2-EVO;
• 21.2 versions prior to 21.2R3-S2-EVO;
• 21.3 versions prior to 21.3R3-S1-EVO;
• 21.4 versions prior to 21.4R2-S2-EVO.

Weakness

The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.

Affected Software

Potential Mitigations

• Run the code in a “jail” or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
• OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
• This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
• Be careful to avoid CWE-243 and other weaknesses related to jails.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/1.html
• https://cwe.mitre.org/data/definitions/122.html
• https://cwe.mitre.org/data/definitions/127.html
• https://cwe.mitre.org/data/definitions/17.html
• https://cwe.mitre.org/data/definitions/180.html
• https://cwe.mitre.org/data/definitions/206.html
• https://cwe.mitre.org/data/definitions/234.html
• https://cwe.mitre.org/data/definitions/60.html
• https://cwe.mitre.org/data/definitions/61.html
• https://cwe.mitre.org/data/definitions/62.html
• https://cwe.mitre.org/data/definitions/642.html

References

• https://supprtportal.juniper.net/JSA73167
• https://supprtportal.juniper.net/JSA73167