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CVE-2023-3961

Samba path traversal

9.1 CRITICALEPSS 2.69%
  1. Published3 Nov 2023

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Redhat Storage3.0
Samba≥ 4.18.0 < 4.18.8 · ≥ 4.19.0 < 4.19.1 · < 4.17.12
Fedoraproject Fedora39
Redhat Enterprise Linux8.0
Redhat Enterprise Linux Eus9.0

Remediation

Fixed in
Samba≥ 4.18.8

Frequently asked

Is CVE-2023-3961 being actively exploited?

CVE-2023-3961 is not in the CISA KEV catalog. Its EPSS exploit probability is 2.69%.

How severe is CVE-2023-3961?

CVE-2023-3961 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 2.69% probability of exploitation.

Which products are affected by CVE-2023-3961?

Affected products include Redhat Storage, Samba, Fedoraproject Fedora, Redhat Enterprise Linux, Redhat Enterprise Linux Eus.

How do I fix CVE-2023-3961?

Upgrade affected software to a fixed version, for example Samba 4.18.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-3961 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.