CVE-2019-13228 : Security Advisory and Response

In versions earlier than 1.1.3, deepin-clone contains a vulnerability in the BootDoctor::fix() function where it utilizes a static path, specifically /tmp/repo.iso, to download an ISO file and also follows symbolic links. Exploiting this vulnerability, an unauthorized user without sufficient privileges can create a symlink attack in that path, leading to the creation or modification of files in various locations within the file system. It is important to note that the content of these files is beyond the control of the attacker. Additionally, an attacker can potentially exploit a race condition to replace the /tmp/repo.iso symlink with an ISO file of their choice, allowing for further privilege escalation.

Understanding CVE-2019-13228

This CVE identifies a security vulnerability in deepin-clone versions prior to 1.1.3.

What is CVE-2019-13228?

CVE-2019-13228 is a vulnerability in deepin-clone that allows unauthorized users to create symlink attacks and potentially escalate privileges.

The Impact of CVE-2019-13228

The vulnerability can lead to unauthorized modification of files in various system locations and potential privilege escalation for attackers.

Technical Details of CVE-2019-13228

deepin-clone before version 1.1.3 is affected by this vulnerability.

Vulnerability Description

The vulnerability lies in the use of a fixed path /tmp/repo.iso in the BootDoctor::fix() function, enabling symlink attacks and potential file system modifications.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions before 1.1.3

Exploitation Mechanism

Unauthorized users can exploit the static path /tmp/repo.iso to create symlink attacks.
Attackers can manipulate files in the system and potentially escalate privileges.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Update deepin-clone to version 1.1.3 or later to mitigate the vulnerability.
Regularly monitor and restrict access to critical system paths to prevent unauthorized modifications.

Long-Term Security Practices

Implement the principle of least privilege to limit user access rights.
Conduct regular security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by the vendor to address known vulnerabilities.