CVE-2026-3120 Overview
CVE-2026-3120 is a code injection vulnerability in Profelis Information and Consulting Trade and Industry Limited Company SambaBox. The flaw maps to CWE-94, Improper Control of Generation of Code, and permits operating system command injection. Affected releases span SambaBox version 5.1 through versions earlier than 5.3. An authenticated attacker with high privileges can inject arbitrary commands over the network and compromise the confidentiality, integrity, and availability of the host. The Turkish national CERT (USOM) has issued an advisory tracking this issue.
Critical Impact
Authenticated network attackers can execute arbitrary OS commands on SambaBox appliances, leading to full system compromise of the identity and file-sharing service.
Affected Products
- Profelis SambaBox 5.1
- Profelis SambaBox 5.2
- Profelis SambaBox versions prior to 5.3
Discovery Timeline
- 2026-05-04 - CVE-2026-3120 published to NVD
- 2026-05-05 - Last updated in NVD database
Technical Details for CVE-2026-3120
Vulnerability Analysis
SambaBox is an integrated identity, authentication, and file-sharing appliance built around Samba. CVE-2026-3120 exists because the product fails to properly control the generation of code from user-supplied input. Attacker-controlled values reach an OS command interpreter without sufficient sanitization or parameterization. The result is OS Command Injection executed in the context of the SambaBox service. Successful exploitation impacts confidentiality, integrity, and availability simultaneously, since the injected commands inherit the privileges of the running process. The issue affects releases from version 5.1 up to but not including version 5.3.
Root Cause
The root cause is classified under [CWE-94] Improper Control of Generation of Code. The application constructs code or shell commands from input fields without enforcing strict validation, escaping, or use of safe APIs. When the constructed string is passed to a system shell, embedded metacharacters are interpreted as additional commands rather than data.
Attack Vector
The attack vector is network-based and requires high privilege authentication, which typically corresponds to an administrative or operator role on the appliance. No user interaction is required. An attacker submits crafted parameters to a vulnerable management interface or API endpoint. The injected payload is concatenated into a shell command and executed on the underlying operating system. See the USOM Security Announcement for vendor-coordinated guidance.
No verified proof-of-concept code is publicly available at this time. Detailed exploitation specifics are not disclosed in the public advisory.
Detection Methods for CVE-2026-3120
Indicators of Compromise
- Unexpected child processes spawned by SambaBox web or management daemons, particularly sh, bash, python, perl, or nc.
- Outbound connections from the appliance to unfamiliar hosts following administrative API requests.
- New or modified files in system directories, cron entries, or systemd units created outside scheduled maintenance windows.
- Authentication logs showing privileged sessions originating from atypical source addresses immediately preceding shell activity.
Detection Strategies
- Monitor process lineage on SambaBox hosts and alert when management service processes spawn shell interpreters.
- Inspect HTTP request bodies and query strings sent to management endpoints for shell metacharacters such as ;, |, `, $(), and newline sequences.
- Correlate administrator logins with subsequent process creation and outbound network events to identify hands-on-keyboard exploitation.
Monitoring Recommendations
- Forward SambaBox audit logs, web server logs, and Linux auditd events to a central SIEM for retention and correlation.
- Baseline normal administrative activity and alert on deviations such as command execution outside change windows.
- Track integrity of /etc, /usr/local, and SambaBox application directories with file integrity monitoring.
How to Mitigate CVE-2026-3120
Immediate Actions Required
- Upgrade SambaBox to version 5.3 or later, which is the first release outside the affected range.
- Restrict network access to the SambaBox management interface to a dedicated administrative network or VPN.
- Rotate credentials for all privileged SambaBox accounts and review recent administrative activity for anomalies.
- Enforce multi-factor authentication on administrator accounts to reduce the risk of credential abuse satisfying the high-privilege precondition.
Patch Information
Profelis addresses the vulnerability in SambaBox version 5.3. Apply the upgrade following the vendor's documented procedure. Refer to the USOM Security Announcement for the official notification and any subsequent vendor guidance.
Workarounds
- Limit administrative access to trusted source IP addresses using firewall or reverse-proxy access control lists until the upgrade is complete.
- Reduce the number of accounts holding administrator privileges and audit existing role assignments.
- Disable any non-essential management services or APIs exposed by the appliance.
# Configuration example: restrict SambaBox management access at the host firewall
iptables -A INPUT -p tcp --dport 443 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
