All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange. In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a crash there is harmless).
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 10 products from samba, from fedoraproject, from redhat and 7 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2020-01-21T18:15:12.717
2025-01-14T19:29:55.853
Modified
CVSSv3.1: 6.5 (MEDIUM)
AV:N/AC:H/Au:N/C:N/I:N/A:P
4.9
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | samba | samba | < 4.9.18 | Yes |
| Application | samba | samba | < 4.10.12 | Yes |
| Application | samba | samba | < 4.11.5 | Yes |
| Operating System | fedoraproject | fedora | 30 | Yes |
| Operating System | fedoraproject | fedora | 31 | Yes |
| Application | redhat | storage | 3.0 | Yes |
| Operating System | redhat | enterprise_linux | 7.0 | Yes |
| Operating System | redhat | enterprise_linux | 8.0 | Yes |
| Operating System | canonical | ubuntu_linux | 16.04 | Yes |
| Operating System | canonical | ubuntu_linux | 18.04 | Yes |
| Operating System | canonical | ubuntu_linux | 19.04 | Yes |
| Operating System | canonical | ubuntu_linux | 19.10 | Yes |
| Application | synology | directory_server | - | Yes |
| Application | synology | router_manager | 1.2 | Yes |
| Application | synology | skynas | - | Yes |
| Operating System | synology | diskstation_manager | 6.2 | Yes |
| Operating System | debian | debian_linux | 9.0 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For samba's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.