CVE-2024-47176

Sep 28, 2024

Published Date: 2024-09-26T22:15:04.497
Last Modified: 2024-09-26T22:15:04.497

CVSS Score: 8.3 (HIGH)

EPSS Score: 0.06%

Risk Score: 5.81 (HIGH)

Risk Score based on CVSS score and EPSS. This score is for reference purposes and is not internationally recognized.

Meter Needle
CVSS: 8.3  |  EPSS: 0.06%
NVD Links:

Description: CUPS is a standards-based, open-source printing system, and `cups-browsed` contains network printing functionality including, but not limited to, auto-discovering print services and shared printers. `cups-browsed` binds to `INADDR_ANY:631`, causing it to trust any packet from any source, and can cause the `Get-Printer-Attributes` IPP request to an attacker controlled URL.

Due to the service binding to `*:631 ( INADDR_ANY )`, multiple bugs in `cups-browsed` can be exploited in sequence to introduce a malicious printer to the system. This chain of exploits ultimately enables an attacker to execute arbitrary commands remotely on the target machine without authentication when a print job is started. This poses a significant security risk over the network. Notably, this vulnerability is particularly concerning as it can be exploited from the public internet, potentially exposing a vast number of systems to remote attacks if their CUPS services are enabled.

Mitre ATT&CK Technical v15.1

T1153 – Source
T1587.004 – Exploits
T1053.002 – At
T1588.005 – Exploits

Technical Analysis & Mitigation Measures

1. Technical Attack Analysis:
– Attack Techniques :
– T1153 – Source : Attackers can leverage the `cups-browsed` service’s trust in incoming packets to send malicious print jobs or commands, which can lead to unauthorized access and control over the affected system.
– T1587.004 – Exploits : Exploiting vulnerabilities in `cups-browsed` can allow attackers to conduct a series of exploits, leading to the introduction of a malicious printer that can execute arbitrary commands.
– T1053.002 – At : The ability to execute scheduled print jobs means that once the malicious printer is introduced, the attacker can maintain persistence on the system by scheduling tasks via print jobs.
– T1588.005 – Exploits : This technique focuses on exploiting the vulnerabilities in the CUPS service to gain unauthorized control, allowing attackers to manipulate the print system for further malicious actions.

– Possible Outcomes of Exploitation :
– Unauthorized remote command execution on vulnerable systems.
– Potential data exfiltration through the compromised print jobs.
– Increased lateral movement within a network, as control over one system can lead to further exploits against other connected devices.
– Persistent backdoor access through scheduled tasks associated with printing operations.

2. Mitigation Measures:
– Disable `cups-browsed` if not in use.
– Configure CUPS to only listen on specific interfaces (not `INADDR_ANY`).
– Implement firewall rules to restrict access to port 631 from untrusted networks.
– Regularly update CUPS to the latest version to patch known vulnerabilities.
– Employ network segmentation to isolate printing services from sensitive systems.
– Monitor and log print jobs for unusual activity.
– Implement strict access controls on CUPS configuration files.
– Use secure communication protocols (like IPP over HTTPS) for print jobs.

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Reference Links

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