The Nokia Single RAN baseband software earlier than 23R2-SR 1.0 MP can be made to reveal the exact software release version by sending a specific HTTP POST request through the Mobile Network Operator (MNO) internal RAN management network.
Nokia Single RAN baseband software earlier than 24R1-SR 1.0 MP contains administrative shell input validation fault, which authenticated admin user can, in theory, potentially use for injecting arbitrary commands for unprivileged baseband OAM service process execution via special characters added to baseband internal COMA_config.xml file.
This issue has been corrected starting from release 24R1-SR 1.0 MP and later, by adding proper input validation to OAM service process which prevents injecting special characters via baseband internal COMA_config.xml file.
Nokia Single RAN AirScale baseband allows an authenticated administrative user access to all physical boards after performing a single login to the baseband system board. The baseband does not re-authenticate the user when they connect from the baseband system board to the baseband capacity boards using the internal bsoc SSH service, which is available only internally within the baseband and through the internal backplane between the boards. The bsoc SSH allows login from one board to another via the baseband internal backplane using an SSH private key present on the baseband system board.
This bsoc SSH capability was previously considered an administrative functionality but has now been restricted to be available only to baseband root-privileged administrators. This restriction mitigates the possibility of misuse with lower-level privileges (e.g., from baseband software images). This mitigation is included starting from release 23R4-SR 3.0 MP and later
The Single RAN baseband OAM service is intended to run as an unprivileged service. However, it initially starts with root privileges and assigns certain capabilities before dropping to an unprivileged level. The capabilities retained from the root period are considered extensive after the privilege drop and, in theory, could potentially allow actions beyond the intended scope of the OAM service. These actions could include gaining root privileges, accessing root-owned files, modifying them as the file owner, and then returning them to root ownership. This issue has been corrected starting from release 24R1-SR 0.2 MP and later.
Beginning with release 24R1-SR 0.2 MP, the OAM service software capabilities are restricted to the minimum necessary.
Sending a crafted SOAP "provision" operation message PlanId field within the Mobile Network Operator (MNO) internal Radio Access Network (RAN) management network can cause path traversal issue in Nokia Single RAN baseband software with versions earlier than release 24R1-SR 1.0 MP. This issue has been corrected to release 24R1-SR 1.0 MP and later.
Beginning with release 24R1-SR 1.0 MP, the OAM service software performed PlanId field input validations mitigate the reported path traversal issue.
Sending a crafted SOAP "provision" operation message archive field within the Mobile Network Operator (MNO) internal Radio Access Network (RAN) management network can cause path traversal issue in Nokia Single RAN baseband software with versions earlier than release 24R1-SR 1.0 MP. This issue has been corrected to release 24R1-SR 1.0 MP and later.
Beginning with release 24R1-SR 1.0 MP, the OAM service software utilizes libarchive APIs with security options enabled, effectively mitigating the reported path traversal issue.
Sending a crafted SOAP "set" operation message within the Mobile Network Operator (MNO) internal Radio Access Network (RAN) management network can cause Nokia Single RAN baseband OAM service component restart with software versions earlier than release 24R1-SR 1.0 MP. This issue has been corrected to release 24R1-SR 1.0 MP and later.
The OAM service component restarts automatically after the stack overflow without causing a base station restart or network service degradation, and without leaving any permanent impact on the Nokia Single RAN baseband OAM service.