CVE-2024-51503: Trend Micro Deep Security Agent RCE Flaw

CVE-2024-51503 Overview

CVE-2024-51503 is a command injection vulnerability in the Trend Micro Deep Security 20 Agent that allows an attacker to escalate privileges and execute arbitrary code on an affected machine. The flaw resides in the security agent's manual scan command handling. An attacker with low-privileged code execution on the target system can exploit the issue locally. Attackers holding domain user privileges can also inject commands remotely into other machines in the same domain. Trend Micro published guidance in solution article KA-0018154, and the issue was coordinated through the Zero Day Initiative as advisory ZDI-24-1516.

Critical Impact
Successful exploitation yields arbitrary code execution with elevated privileges, and domain-authenticated attackers can pivot laterally to other machines running the vulnerable agent.

Affected Products

Trend Micro Deep Security Agent 20.0 (Long Term Support), including updates through Update8438
Trend Micro Deep Security Agent 20.0.1 (Long Term Support), including updates through Update19250
Deployments where the agent is joined to a Windows domain with reachable peer machines

Discovery Timeline

2024-11-19 - CVE-2024-51503 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-51503

Vulnerability Analysis

The vulnerability is a command injection weakness classified under [CWE-78] (OS Command Injection) and [CWE-77] (Command Injection). It affects the manual scan command path of the Deep Security Agent, where untrusted input is passed into an operating system command without adequate neutralization. Because the agent runs with elevated privileges, injected commands execute in a security context higher than the calling user. The network attack vector applies when the agent accepts scan-related input from a domain peer, enabling lateral command execution across the domain. According to the published EPSS data, the vulnerability sits in the upper percentile of predicted exploitation likelihood among active CVEs.

Root Cause

The root cause is improper neutralization of special elements used in an OS command inside the security agent's manual scan handling. Parameters supplied to the scan routine are concatenated into a command string executed by the host operating system. The agent does not enforce strict allow-lists, argument boundaries, or safe process-invocation APIs for these parameters.

Attack Vector

Local exploitation requires an attacker to first gain the ability to execute low-privileged code on the target host. Remote exploitation requires domain user credentials and network reachability to the target agent from another domain-joined host. The attacker submits crafted scan input containing shell metacharacters or additional command tokens. The Deep Security Agent then executes the injected payload with agent privileges, resulting in privilege escalation and arbitrary code execution.

No verified public exploit code is available at this time. Technical detail is described in the Zero Day Initiative Advisory ZDI-24-1516.

Detection Methods for CVE-2024-51503

Indicators of Compromise

Unexpected child processes spawned by Deep Security Agent binaries such as ds_agent.exe or associated scan helper processes
Command lines from agent processes containing shell metacharacters (&, |, ;, backticks) or unexpected interpreters (cmd.exe, powershell.exe)
Manual scan initiations originating from non-administrative domain accounts or from peer hosts rather than the Deep Security Manager

Detection Strategies

Baseline the normal process tree of the Deep Security Agent and alert on deviations, particularly on new child processes or scripting hosts launched by the agent
Correlate Windows Security event logs (4688 process creation) with Deep Security Agent audit logs to identify scan commands whose arguments contain suspicious characters
Hunt for lateral movement patterns where domain accounts trigger manual scans on remote hosts followed by outbound network activity from the agent process

Monitoring Recommendations

Forward Deep Security Agent logs, Windows process creation events, and domain authentication events to a centralized SIEM for correlation
Monitor KA-0018154 and Trend Micro product bulletins for updated fixed-build guidance and re-scan endpoint inventory for outdated agent versions
Alert on any manual scan requests initiated over the network rather than through the Deep Security Manager management channel

How to Mitigate CVE-2024-51503

Immediate Actions Required

Inventory all Deep Security Agent 20.0 and 20.0.1 installations and identify versions predating the vendor fix
Apply the fixed agent build referenced in the Trend Micro Solution Guide KA-0018154 to every affected endpoint
Restrict which domain accounts can initiate manual scans and remove unnecessary domain user privileges from workstation and server accounts

Patch Information

Trend Micro has released fixed builds for Deep Security Agent 20 LTS. Refer to the vendor advisory KA-0018154 for the specific update numbers that address CVE-2024-51503 and follow the documented upgrade procedure for both 20.0 and 20.0.1 branches.

Workarounds

Limit network exposure of the Deep Security Agent to only the Deep Security Manager by enforcing host-based firewall rules that block peer-to-peer agent traffic on the domain
Enforce the principle of least privilege for domain users and require multi-factor authentication for accounts that can log on to hosts running the agent
Enable enhanced logging on the agent and forward events to centralized monitoring so any manual scan invocation can be reviewed until patches are deployed

bash

# Example Windows firewall restriction limiting inbound agent traffic
# to the Deep Security Manager IP only (replace with your DSM address)
netsh advfirewall firewall add rule name="Restrict DSA Inbound to DSM" \
    dir=in action=block program="C:\Program Files\Trend Micro\Deep Security Agent\ds_agent.exe" \
    remoteip=any
netsh advfirewall firewall add rule name="Allow DSA Inbound from DSM" \
    dir=in action=allow program="C:\Program Files\Trend Micro\Deep Security Agent\ds_agent.exe" \
    remoteip=<DSM_IP_ADDRESS>