CVE-2023-0210

A recent analysis by the Sysdig Threat Research Team highlights a vulnerability in KSMBD, a Linux kernel server that implements the SMB3 protocol for file sharing. This vulnerability, identified as CVE-2023-0210, involves a heap overflow in the NTLM authentication code, potentially leading to a denial of service through kernel panic. The vulnerability requires prior knowledge of a valid username to exploit and results from an integer underflow that allows an attacker to overflow an allocated heap buffer. Despite the technical complexity and potential severity, the impact may be limited as KSMBD is not enabled by default in most Linux distributions, requiring users to manually configure it. Additionally, exposing SMB ports to the internet is generally discouraged due to security risks, reducing the likelihood of widespread exploitation.