The host is running SMB/NETBIOS and prone to authentication bypass Vulnerability Impact Successful exploitation could allow attackers to use shares to cause the system to crash.

SMB Security Best Practices | CISA Jan 16, 2017 Null Session Attacks and How to Avoid Them - dummies They don’t have the vulnerabilities described in the following list. You can easily prevent null session connection hacks by implementing one or more of the following security measures: Block NetBIOS on your Windows server by preventing these TCP ports from passing through your network firewall or personal firewall: 139 (NetBIOS sessions

NetBIOS is a protocol used for File and Print Sharing under all current versions of Windows. While this in itself is not a problem, the way that the protocol is implemented can be. There are a number of vulnerabilities associated with leaving this port open.

On 2019 September 15, Cisco stopped publishing non-Cisco product alerts — alerts with vulnerability information about third-party software (TPS). Cisco will continue to publish Security Advisories to address both Cisco proprietary and TPS vulnerabilities per the Cisco Security Vulnerability Policy. netstat - Windows TCP Port 139 Netbios-ssn vulnerability I ran netstat -b on my computer. Two results showed that I do not understand, VAIO being another PC on the LAN. [firefox.exe] TCP 192.168.100.106:49186 VAIO:netbios-ssn TIME_WAIT TCP 192.168.100 NetBIOS and SMB-Based Vulnerabilities. NBT is the default network protocol in most built-in Windows NT network functions. This protocol consists of both the NetBIOS (the upper half) and the TCP/IP protocols (the lower half). NetBIOS serves as an abstraction layer in this arrangement. The NetBIOS protocol is used to communicate a considerable amount of information about the status of machines within the network, in particular the nature of processes and sessions running at this layer.

Lecture 16: TCP/IP Vulnerabilities and DoS Attacks: IP

NetBIOS over TCP/IP is a networking protocol that allows legacy computer applications relying on the NetBIOS to be used on modern TCP/IP networks. Enabling NetBios might help an attackers access shared directories, files and also gain sensitive information such as computer name, domain, or workgroup. Netbios and NCP vulnerabilities I have been ask by our security people to address the following issues on My Netware 6.5 servers: Null Session Share Enumeration Dec 04, 2017 · Broadband protocols, like NetBIOS over TCP/IP and LLMNR are also obsolete and used in the majority of modern networks only for compatibility reasons. At the same time, hackers have different tools that use some vulnerabilities in NetBIOS and LLMNR to capture user credentials in a local network (including NTLMv2 hashes). Vulnerability Categories. Every vulnerability is mapped to a vulnerability category. This includes vulnerabilities, potential vulnerabilities and information gathered checks. Some vulnerability categories are platform-specific (for example Debian and SUSE) while others are more general (for example Database and Firewall). Learn more Along with ports 135, 137 and 139, port 445 is a traditional Microsoft networking port with tie-ins to the original NetBIOS service found in earlier versions of Windows OSes. Oct 06, 2017 · We have this vulnerability "Remote User List Disclosure Using NetBIOS" and the security scanner got all AD user list anonymously from the DCs. We applied below fixes on the DCs through GPO. Enable: Network access: Restrict Anonymous access to Named Pipes and Shares Network access: Do not allow anonymous enumeration of SAM accounts Vulnerability categories. Every vulnerability is mapped to one vulnerability category. This includes vulnerabilities, potential vulnerabilities and information gathered checks. When a vulnerability matches multiple categories, our service determines which category is the best match and assigns the vulnerability to that category.