CVE-2017-8806 Explained : Impact and Mitigation

The Debian package postgresql-common had a vulnerability in handling symbolic links, affecting PostgreSQL-related scripts specific to Debian and Ubuntu.

Understanding CVE-2017-8806

This CVE involves insecure handling of symbolic links in PostgreSQL-related scripts for Debian and Ubuntu, potentially leading to a local denial of service.

What is CVE-2017-8806?

The vulnerability in the postgresql-common package allowed for the insecure handling of symbolic links in scripts like pg_ctlcluster, pg_createcluster, and pg_upgradecluster.

The Impact of CVE-2017-8806

Exploiting this flaw could result in a local denial of service scenario by overwriting arbitrary files, affecting the PostgreSQL database system and related packages for Debian and Ubuntu.

Technical Details of CVE-2017-8806

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The insecure handling of symbolic links in scripts within the postgresql-common package could be exploited to overwrite arbitrary files, leading to a local denial of service.

Affected Systems and Versions

Product: PostgreSQL-related scripts specific to Debian and Ubuntu
Versions: Before 181+deb9u1

Exploitation Mechanism

The vulnerability allowed attackers to manipulate symbolic links in scripts, potentially leading to file overwrites and local denial of service.

Mitigation and Prevention

Understanding how to mitigate and prevent the CVE is crucial for system security.

Immediate Steps to Take

Update the postgresql-common package to version 181+deb9u1 or later.
Monitor for any unauthorized file modifications.

Long-Term Security Practices

Regularly update all software packages to patch known vulnerabilities.
Implement least privilege access controls to limit potential damage from exploitation.

Patching and Updates

Ensure timely installation of security patches and updates to prevent exploitation of known vulnerabilities.