IT Forensics · Linux

Forensic analysis of a PostgreSQL database – Forensic evaluation of transaction history and accesses

PostgreSQL is a widely used object-relational database system which, through its write-ahead log and configurable logging options, can provide detailed information on transactions and accesses.

Enquire without obligation

The information obtained through forensic analysis depends to a large extent on which logging options were active at the relevant time; this is why they are carefully examined at the start of every investigation.

Why LanCologne?

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.

Our services

We analyse PostgreSQL database instances, including write-ahead logs and existing log files, and use this information to reconstruct accesses, transactions and data changes during the relevant period.

Typical areas of application

•Reconstruction of unauthorised database accesses
•Detection of data manipulation using transaction logs
•Investigation of incidents caused by SQL injection
•Assessment of the logging configuration at the time of the incident
•Incident Response on Linux Systems
•Judicial and non-judicial expert reports

This is how a PostgreSQL analysis works

Once the database files and the write-ahead log have been backed up, the active logging configuration is first checked. Available transaction and access information is then systematically analysed and correlated with other system artefacts.

Why is PostgreSQL analysis relevant to forensic investigations?

In certain scenarios, the write-ahead log may allow conclusions to be drawn about transactions that have been carried out, even if the results have already been modified or deleted in the actual database.

As PostgreSQL is frequently used for business-critical applications, a robust and traceable reconstruction of database accesses is often of considerable economic importance.

Frequently Asked Questions

What is the write-ahead log and why is it relevant in a forensic context?+
It logs changes before they are applied to the actual data files and can therefore provide additional insights into the transactions that have been carried out.
Are all accesses logged by default?+
No, the scope of logging is configurable and must be assessed on a case-by-case basis for each investigation.
Can deleted records be recovered?+
To some extent, depending on the availability of transaction logs, backups and the time at which the data was deleted.

🔗 Related topics

LanCologne – Linux Forensics Cologne

Do you require a professional forensic investigation into „forensic analysis of PostgreSQL databases"? LanCologne can assist you with the legally admissible preservation of digital evidence and the transparent analysis of relevant Linux artefacts.

Get in touch now