Is CVE-2023-3961 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 2%.

What products does CVE-2023-3961 affect?

Tracked products affected include Samba. Check the version you run to see whether it is affected.

How do I fix CVE-2023-3961?

Apply the vendor fix promptly. Upgrade affected products to a fixed version.

CVE-2023-3961

Q: What is CVE-2023-3961?

CVE-2023-3961 is a critical-severity software vulnerability (Path traversal) with a CVSS score of 9.1. A path traversal vulnerability was identified in Samba when processing client pipe names connecting to Unix domain sockets within a private directory. Samba typically uses this mechanism to connect SMB clients to remote procedure call (RPC)

CRITICAL severity · CVSS 9.1 · Path traversal

9.1CVSS CRITICAL

Summary

A path traversal vulnerability was identified in Samba when processing client pipe names connecting to Unix domain sockets within a private directory. Samba typically uses this mechanism to connect SMB clients to remote procedure call (RPC) services like SAMR LSA or SPOOLSS, which Samba initiates on demand. However, due to inadequate sanitization of incoming client pipe names, allowing a client to send a pipe name containing Unix directory traversal characters (../). This could result in SMB clients connecting as root to Unix domain sockets outside the private directory. If an attacker or client managed to send a pipe name resolving to an external service using an existing Unix domain socket, it could potentially lead to unauthorized access to the service and consequential adverse events, including compromise or service crashes.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactHigh

Availability impactHigh

Exploit probability (EPSS)2%

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products we track (1)

Samba

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

CVE-2023-3961

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information