Samba Pipe Name Path Traversal Potential Priv Escalation
CVE-2023-3961 Published on November 3, 2023

Samba: smbd allows client access to unix domain sockets on the file system as root
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.

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Vulnerability Analysis

CVE-2023-3961 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
HIGH
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public. 7 days later.

Weakness Type

What is a Directory traversal Vulnerability?

The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

CVE-2023-3961 has been classified to as a Directory traversal vulnerability or weakness.


Products Associated with CVE-2023-3961

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-3961 are published in these products:

Samba
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Storage
 
Red Hat Enterprise Linux Eus
 
Fedora Project Fedora
 
Oracle
 
Red Hat Rhel Eus
 
Red Hat Rhev Hypervisor
 

Affected Versions

Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8.6 Extended Update Support: Red Hat Enterprise Linux 8.8 Extended Update Support: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9.0 Extended Update Support: Red Hat Enterprise Linux 9.2 Extended Update Support: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Storage 3:

Exploit Probability

EPSS
1.94%
Percentile
83.19%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.