Penetration Testing Execution Standard (PTES)

Introduction

The Penetration Testing Execution Standard (PTES) is a publicly available framework for conducting structured and reproducible penetration tests. The goal of the standard is to provide a consistent methodology that covers both technical and organizational aspects of a penetration test.

PTES was developed by a group of experienced security researchers and penetration testers to define a clear structure for professional security assessments. The standard describes the entire lifecycle of a penetration test – from initial planning to final reporting.

The approach of PTES is based on the assumption that a penetration test involves more than simply exploiting individual vulnerabilities. Instead, the test is understood as a structured process that includes organizational coordination, methodological procedures, and comprehensive documentation.

The standard structures the execution of a penetration test into several phases that describe different activities during a security assessment. These phases range from the preparation of the test to the technical analysis and the documentation of the results.

The standard is publicly available at:
http://www.pentest-standard.org/index.php/Main_Page

Critical Discussion

Despite its popularity, the Penetration Testing Execution Standard is rarely used today as the sole methodological foundation for penetration tests. One major reason is the limited technical depth of the standard. While the described phases define the overall workflow of a penetration test, they contain only a small number of concrete testing procedures or technical methods.

PTES intentionally describes the process of a penetration test at a conceptual level. The individual phases primarily define a methodological framework rather than a detailed technical methodology. In practical engagements, additional technical guides, project-specific methods, and the experience of penetration testers are therefore required.

Another limitation is that parts of the technical description have become outdated. Some examples within PTES refer to platforms and tools that are no longer widely relevant in modern environments. For instance, older Windows versions such as Windows XP and Windows 7 are mentioned as reference systems for certain tools in the technical sections.

Modern IT architectures are also only partially addressed in the original PTES. Topics such as cloud infrastructures, containerized platforms, or complex identity and access management systems play only a minor role within the standard.

Furthermore, PTES is not a formally maintained industry standard with clearly defined governance. There is no standardization organization responsible for regularly updating the framework. As a result, the standard evolves only slowly and does not always reflect current technological developments.

The visibility of PTES within the industry is also partly influenced by the high search engine ranking of the project website pentest-standard.org. The website has maintained strong search visibility for many years and is therefore frequently perceived as a reference for penetration testing methodologies. In practical engagements, however, many professional penetration testing teams rely more heavily on other technical guides and their own internal methodologies.

Phases of PTES

The Penetration Testing Execution Standard structures a penetration test into several sequential phases. These phases provide a methodological framework for the planning, execution, and documentation of a penetration test. In practice, the phases may partially overlap or be performed iteratively.

1. Pre-engagement Interactions

The pre-engagement interactions phase includes all organizational and legal arrangements between the client and the testing team before the actual penetration test begins.

A central element is the clear definition of the test scope. This includes determining which systems, applications, or networks are part of the assessment and which areas are explicitly excluded. In addition, the objectives and expectations of the client are defined, for example the identification of technical vulnerabilities, the evaluation of organizational security controls, or the simulation of realistic attack scenarios.

Another important aspect of this phase is the legal authorization of the test. Because penetration tests may affect critical systems, appropriate approvals and contractual agreements are required. These typically include liability agreements, confidentiality clauses, and emergency contacts in case unexpected system disruptions occur.

Furthermore, communication processes are defined. This includes points of contact on both sides, escalation procedures for critical vulnerabilities, and organizational processes during the assessment. Careful preparation of this phase is essential to minimize legal risks and operational disruptions.

2. Intelligence Gathering

During the intelligence gathering phase, information about the target system, infrastructure, or organization is collected. The goal is to develop a comprehensive understanding of the target environment in order to identify potential attack surfaces.

Both passive and active information gathering techniques may be used. Passive methods include Open Source Intelligence (OSINT), where publicly available information is analyzed. This may include domain information, DNS records, publicly accessible documents, metadata, or indicators of technologies used by the target organization.

Active information gathering may involve scanning networks or services to identify reachable systems, open ports, and available services. The analysis of subdomains, digital certificates, or cloud resources may also be part of this phase.

The collected information forms the basis for the subsequent analysis and attack phases. The better the target environment is understood, the more effectively potential attack paths can be identified.

3. Threat Modeling

In the threat modeling phase, realistic threat scenarios for the target environment are analyzed. The goal of this phase is to structure the previously collected information and systematically derive possible attack paths.

This includes identifying critical assets of the organization, such as sensitive data, central systems, or business-critical applications. Based on this information, potential attacker profiles are evaluated, such as external attackers with no prior knowledge, internal users, or specialized threat actors.

Based on these considerations, possible attack scenarios are modeled. This involves analyzing which systems could provide initial access and what additional steps might allow an attacker to expand their access within the environment.

This analysis helps align the penetration test with realistic threat scenarios and focus the assessment on particularly critical attack paths.

4. Vulnerability Analysis

During the vulnerability analysis phase, systems are examined for technical weaknesses. This phase often represents the most extensive part of a penetration test.

Typically, automated tools are first used to identify potential vulnerabilities. These may include network scanners, vulnerability scanners, or specialized analysis tools for web applications.

In addition, manual analysis of the identified systems is performed. This may include reviewing system configurations, analyzing authentication mechanisms, or identifying logical weaknesses in applications. Especially in complex environments or with custom-developed software, manual analysis is often necessary because automated tools cannot detect all vulnerabilities.

The goal of this phase is to identify and evaluate potential security weaknesses. It is also verified whether identified vulnerabilities are actually exploitable or only represent theoretical risks.

5. Exploitation

During the exploitation phase, identified vulnerabilities are actively exploited in order to verify their practical exploitability. While the vulnerability analysis phase identifies potential weaknesses, the exploitation phase demonstrates their real-world impact.

This may involve attempts to gain access to systems, bypass authentication mechanisms, or execute code on target systems. The goal is not to permanently compromise systems but to demonstrate the consequences of a successful attack in a controlled manner.

Activities in this phase are typically performed carefully and with consideration of potential impact on production systems. For this reason, many projects define in advance which types of exploitation techniques are permitted and which actions should be avoided.

The results of this phase provide valuable information for assessing the real-world risk posed by the identified vulnerabilities.

6. Post Exploitation

The post-exploitation phase examines what actions would be possible after successfully compromising a system. The objective is to analyze how far an attacker could extend their access within the target environment.

Typical activities include analyzing user privileges, searching for sensitive information, and attempting privilege escalation. Additionally, the tester evaluates whether lateral movement within the network is possible, for example by accessing additional systems or services.

The analysis of configuration files, stored credentials, or authentication tokens may also be part of this phase. The goal is to understand the potential impact of a successful attack on the overall infrastructure.

This phase is particularly important because real-world attacks often do not end with the compromise of a single system but expand further within the environment.

7. Reporting

The reporting phase involves the structured documentation of the results of the penetration test. In many projects, the final report represents the most important outcome of the entire assessment.

A professional report typically includes both detailed technical findings and an executive summary that can be understood by non-technical stakeholders. This includes descriptions of the identified vulnerabilities, an evaluation of their risks, and reproducible steps describing how the issues were exploited.

In addition, the report usually contains concrete recommendations for remediation. These may involve technical fixes, organizational improvements, or adjustments to security processes.

The report serves as the basis for prioritizing security improvements and supports organizations in strengthening their security posture over the long term.