IT Forensics · Linux

Proving privilege escalation through forensic analysis – reconstructing unauthorised expansion of privileges

Privilege escalation refers to the process whereby an attacker, starting with initially restricted access, gains higher – usually administrative – privileges on a system.

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To achieve this, attackers frequently exploit known vulnerabilities in system components, misconfigurations in access rights or insecurely configured administrative tools, the forensic detection of which requires specialist technical knowledge.

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Since its foundation, LanCologne has specialised in professional IT forensics. Our staff have decades of experience in the field of information technology and assist companies, solicitors, private individuals and, on a regular basis, the courts in the technical investigation of complex digital matters.

The examination is, as a matter of principle, carried out exclusively on a forensic copy, a forensic image or a data source captured in a technically equivalent manner that preserves the integrity of the evidence. The original evidence remains unchanged and is stored in a manner that preserves its integrity.

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We carry out targeted investigations of systems to look for evidence of privilege escalation, identify the exploited vulnerability or misconfiguration, and reconstruct the chronological sequence of the privilege escalation.

Typical areas of application

•Evidence that a privilege escalation has taken place
•Identification of the exploited vulnerability or misconfiguration
•Reconstruction of the actions carried out following the extension of rights
•Assessment of existing authorisation schemes for vulnerabilities
•Incident Response on Linux Systems
•Judicial and non-judicial expert reports

This is how a privilege escalation investigation is carried out

Once a backup has been taken, permission configurations, sudo logs and relevant system artefacts are examined for evidence of any privilege escalation. The sequence of events is reconstructed chronologically in order to document both the initial access used and the permissions ultimately obtained.

Why is the privilege escalation investigation relevant from a forensic perspective?

Evidence of privilege escalation is often crucial for assessing the actual extent of the damage, as administrative rights typically grant an attacker far-reaching access to the entire system.

Identifying the specific vulnerability or misconfiguration that has been exploited is also a prerequisite for specifically addressing comparable vulnerabilities on other systems.

Frequently Asked Questions

What methods are commonly used for privilege escalation?+
These included exploited software vulnerabilities, incorrectly configured sudo permissions, and insecurely set file and directory permissions.
How is a successful extension of rights verified forensically?+
By correlating authentication, `sudo` and system logs with the timing of observed administrative actions carried out by an account that was originally restricted.
Can the test also be used for preventive purposes?+
Yes, the insights gained in this way regarding vulnerabilities and misconfigurations can also be used to harden similar systems in a targeted manner.

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Do you require a professional forensic investigation into „proving privilege escalation forensically"? LanCologne can assist you in securing digital evidence in a manner that stands up in court, as well as in the transparent analysis of relevant Linux artefacts.

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