CVE-2019-15024 : Exploit Details and Defense Strategies

ClickHouse prior to version 19.14.3 is vulnerable to an arbitrary write attack through ZooKeeper, allowing an attacker to manipulate clickhouse-server to write to any file path on the system.

Understanding CVE-2019-15024

This CVE identifies a security vulnerability in ClickHouse versions before 19.14.3 that could be exploited by an attacker with write access to ZooKeeper.

What is CVE-2019-15024?

Prior to version 19.14.3, an attacker with write access to ZooKeeper and the ability to run a custom server on the same network as ClickHouse can create a malicious server mimicking ClickHouse. This server can be registered in ZooKeeper, enabling the manipulation of clickhouse-server to write to any chosen file path on the system.

The Impact of CVE-2019-15024

The vulnerability allows an attacker to execute arbitrary write operations on the system, potentially leading to unauthorized access and data manipulation.

Technical Details of CVE-2019-15024

ClickHouse's vulnerability to arbitrary write attacks through ZooKeeper exposes systems to significant risks.

Vulnerability Description

An attacker can create a malicious ClickHouse replica, register it in ZooKeeper, and trick other replicas into writing data to unauthorized file paths.

Affected Systems and Versions

Product: ClickHouse
Vendor: n/a
Versions Affected: All versions prior to 19.14.3

Exploitation Mechanism

Attacker needs write access to ZooKeeper
Ability to run a custom server on the same network as ClickHouse
Creation of a malicious server mimicking ClickHouse
Manipulation of clickhouse-server to write to any file path

Mitigation and Prevention

Protecting systems from CVE-2019-15024 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade ClickHouse to version 19.14.3 or newer
Restrict write access to ZooKeeper
Monitor network for suspicious activities

Long-Term Security Practices

Implement network segmentation to isolate critical systems
Conduct regular security audits and penetration testing
Educate users on security best practices

Patching and Updates

Apply security patches promptly
Stay informed about security advisories and updates from ClickHouse