External risk intelligence

PHPYun Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2024-54724

PHPYun is a web-based talent management system. Applications of this type are commonly deployed as public-facing web portals to facilitate user registrations, job postings, and candidate applications, making the service surface typically accessible from the internet.

Code Injection

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

PHPYun, a web-based talent management system, contains a critical vulnerability that could allow unauthorized code execution and file manipulation. This issue affects how the system handles file writing and inclusion, potentially leading to significant system compromise if exploited. The main concern is confirming the relevance and exposure of this system within your organization.

Backdoor allows unauthorized file actions.
Critical flaw in talent management software.
Confirm if this system is in use.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a specially crafted request to a web application using the affected software. This could allow them to write arbitrary files to the server and then include those files, leading to the execution of malicious code.

Requires unauthenticated network access.
Triggered by uploading or including specific files.
Results in critical remote code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to execute arbitrary code on a system running PHPYun by writing to restricted files or including files. This may lead to a compromise of the affected system when the application is publicly accessible.

System data and service behavior.
Arbitrary file writing and inclusion.
Complete system compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability affects PHPYun, a web-based talent management system likely deployed as a public-facing portal. Responsibility for addressing this falls to the application owners, in coordination with infrastructure and security teams. The initial priority is to locate all instances of PHPYun, assess their exposure and business criticality, and confirm the accountable owner before planning remediation based on risk.

Application owners should take ownership.
Verify PHPYun instances and exposure.
Plan remediation based on identified risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is PHPYun?

PHPYun is a web-based talent management system designed to streamline recruitment processes. It acts as a portal for job postings, candidate applications, and user registrations. Because it facilitates external interactions, organizations typically deploy it as a public-facing web service to make it accessible for job seekers and employers.

What does CWE-94 mean in the context of CVE-2024-54724?

CWE-94 refers to improper control of generation of code, often called code injection. In this vulnerability, the flaw allows unauthorized parties to bypass restrictions and write or include arbitrary files on the server. Because the application processes these files, it can inadvertently execute malicious commands, giving an attacker control over the underlying system.

How is this code execution vulnerability triggered?

An attacker triggers the vulnerability by sending a specially crafted network request to the PHPYun application. This request exploits weaknesses in how the software handles file writing and inclusion. It is important to note that this does not require legitimate user credentials; it is an unauthenticated attack that functions through standard network interaction with the application.

Is my PHPYun instance at risk?

According to Halo Surface Signal, PHPYun is often deployed as a public-facing portal, which significantly increases the likelihood that your instance is reachable from the internet. If your system is exposed to the network, it is at higher risk because attackers do not need internal access to reach the vulnerable components.

What should I do if I run PHPYun?

Your first step is to identify all deployed instances of PHPYun within your environment and determine who is responsible for them. Once identified, evaluate the specific exposure of each instance and assess its business criticality. You should then coordinate with your security and infrastructure teams to plan the necessary remediation steps to protect your system.

References

github.com/la12138la/detail/blob/main/1.md

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.