CVE-2025-48208 Overview
CVE-2025-48208 is an LDAP Injection vulnerability affecting Apache HertzBeat, an open-source real-time monitoring system. The flaw stems from improper neutralization of special elements used in Lightweight Directory Access Protocol (LDAP) queries [CWE-90]. An authenticated attacker can craft custom commands that inject malicious LDAP syntax, leading to arbitrary script execution on the host. The issue affects all Apache HertzBeat releases through version 1.7.2. Apache published the advisory on September 9, 2025, and recommends upgrading to version 1.7.3, which contains the fix.
Critical Impact
An authenticated attacker can achieve arbitrary script execution on Apache HertzBeat instances running version 1.7.2 or earlier by injecting crafted input into LDAP queries.
Affected Products
- Apache HertzBeat versions up to and including 1.7.2
- Apache HertzBeat deployments using LDAP-backed command functionality
- Self-hosted HertzBeat monitoring servers exposed to authenticated users
Discovery Timeline
- 2025-09-09 - CVE-2025-48208 published to the National Vulnerability Database (NVD)
- 2025-11-04 - Last updated in NVD database
Technical Details for CVE-2025-48208
Vulnerability Analysis
Apache HertzBeat constructs LDAP queries using attacker-controllable input without proper escaping of reserved LDAP metacharacters. When an authenticated user issues a custom command that flows into an LDAP search filter, special characters such as *, (, ), \, and null bytes alter the filter's logical structure. The malformed filter is then executed against the directory backend, and the response handling path allows the attacker to pivot from query manipulation to arbitrary script execution.
Because the attack requires only low-privileged authenticated access over the network and no user interaction, exploitation is straightforward for an insider or any user who obtains valid credentials. Successful exploitation compromises confidentiality, integrity, and availability of the monitoring host.
Root Cause
The root cause is missing or insufficient input neutralization on parameters that are concatenated into LDAP query strings. The application trusts authenticated command input and does not apply the LDAP-specific escaping defined in RFC 4515. Combined with command-execution sinks downstream of LDAP processing, this transforms a classic injection into a code-execution primitive.
Attack Vector
The attacker authenticates to Apache HertzBeat and submits a crafted command that embeds LDAP control characters into a query. The injected payload manipulates the filter to retrieve unintended data or redirect execution flow into a scripting context. The vulnerability does not require local access or user interaction beyond the authenticated session.
The vulnerability exists in the command-handling logic that integrates with LDAP. Refer to the Apache Mailing List Discussion and the OpenWall Security Update for vendor-provided technical details.
Detection Methods for CVE-2025-48208
Indicators of Compromise
- Unexpected outbound LDAP queries containing wildcard or filter metacharacters such as *)(uid=* originating from HertzBeat hosts
- New or unusual child processes spawned by the HertzBeat Java process, particularly shell or scripting interpreters
- HertzBeat audit logs showing custom commands submitted by low-privileged accounts followed by directory or process anomalies
- Modifications to monitoring scripts, scheduled tasks, or configuration files on the HertzBeat server outside of administrator change windows
Detection Strategies
- Inspect application logs for LDAP filter strings containing unescaped reserved characters submitted via command input fields
- Monitor process lineage from the HertzBeat service account for execution of sh, bash, cmd.exe, powershell.exe, or interpreter binaries
- Alert on authenticated HertzBeat API calls that include LDAP metacharacters in user-supplied parameters
- Correlate authentication events with subsequent command submissions and outbound network connections to LDAP servers
Monitoring Recommendations
- Forward Apache HertzBeat application and access logs to a centralized SIEM for filter-syntax anomaly detection
- Baseline normal LDAP query patterns and alert on deviations that contain injection-style payloads
- Track all command submissions performed by non-administrative HertzBeat accounts and flag commands referencing LDAP resources
How to Mitigate CVE-2025-48208
Immediate Actions Required
- Upgrade Apache HertzBeat to version 1.7.3 or later, which remediates the LDAP injection issue
- Audit existing HertzBeat user accounts and revoke credentials that are unused or assigned to former personnel
- Restrict network access to the HertzBeat management interface using firewall rules or reverse-proxy allowlists
- Review historical logs for evidence of command submissions containing LDAP metacharacters prior to patching
Patch Information
Apache HertzBeat version 1.7.3 contains the official fix. Patch details and discussion are available in the Apache Mailing List Discussion and the OpenWall Security Update. Administrators should validate the upgrade in a staging environment before deploying to production monitoring nodes.
Workarounds
- Disable or restrict the LDAP-integrated command functionality until the upgrade to 1.7.3 is applied
- Enforce strict role-based access control so that only trusted administrators can submit custom commands
- Place the HertzBeat instance behind a web application firewall configured to reject input containing LDAP filter metacharacters
# Verify the installed Apache HertzBeat version and upgrade
java -jar hertzbeat.jar --version
# After upgrade, confirm the binary reports 1.7.3 or later
# Example expected output: HertzBeat 1.7.3
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
