CVE-2019-18183 : Security Advisory and Response

A security flaw in the apply_deltas() function of pacman prior to version 5.2 allows arbitrary command injection when unsigned databases are used.

Understanding CVE-2019-18183

This CVE identifies a vulnerability in the pacman package manager that can be exploited for arbitrary command injection.

What is CVE-2019-18183?

CVE-2019-18183 is a vulnerability in the apply_deltas() function of pacman, which can lead to arbitrary command injection when unsigned databases are employed. Exploiting this flaw requires enabling the non-default delta feature and obtaining a crafted database and delta file controlled by an attacker.

The Impact of CVE-2019-18183

The vulnerability in CVE-2019-18183 could allow an attacker to execute arbitrary commands on the system where the vulnerable version of pacman is installed, potentially leading to unauthorized access or data manipulation.

Technical Details of CVE-2019-18183

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

The vulnerability exists in the apply_deltas() function of pacman before version 5.2, enabling attackers to inject arbitrary commands when using unsigned databases.

Affected Systems and Versions

Systems running pacman versions prior to 5.2
Systems with unsigned databases enabled

Exploitation Mechanism

To exploit this vulnerability, an attacker needs to:

Enable the non-default delta feature
Obtain a crafted database and delta file under their control

Mitigation and Prevention

Protecting systems from CVE-2019-18183 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Update pacman to version 5.2 or later to mitigate the vulnerability
Disable the delta feature if not required
Regularly monitor for updates and security advisories

Long-Term Security Practices

Follow best practices for secure package management
Implement least privilege access controls
Conduct regular security audits and assessments

Patching and Updates

Apply patches and updates promptly to ensure the system is protected from known vulnerabilities