CVE-2023-21268 : Security Advisory and Response

This CVE-2023-21268 was published on August 14, 2023, by Google Android. It involves a vulnerability in the MmsProvider.java component of Android, potentially allowing an attacker to change directory permissions via a path traversal error. This could result in local denial of service of SIM recognition without requiring any additional execution privileges. Notably, user interaction is not necessary for the exploitation of this vulnerability.

Understanding CVE-2023-21268

This section will delve deeper into the nature of CVE-2023-21268, including its impact, technical details, and mitigation strategies.

What is CVE-2023-21268?

CVE-2023-21268 refers to a security flaw in the MmsProvider.java component of Android that could enable an attacker to manipulate directory permissions through a path traversal error. This manipulation could lead to a local denial of service of SIM recognition without the need for extra execution privileges. Importantly, this vulnerability can be exploited without any user interaction.

The Impact of CVE-2023-21268

The impact of CVE-2023-21268 is significant as it could potentially result in a denial of service attack on SIM recognition, affecting the usability and functionality of the targeted Android system. This vulnerability underscores the importance of prompt mitigation measures to prevent exploitation.

Technical Details of CVE-2023-21268

In this section, we will explore the vulnerability description, affected systems and versions, as well as the exploitation mechanism associated with CVE-2023-21268.

Vulnerability Description

The vulnerability in MmsProvider.java allows for directory permissions to be altered due to a path traversal error, leading to a local denial of service of SIM recognition without requiring additional execution permissions. This flaw poses a risk to the integrity and availability of the affected Android systems.

Affected Systems and Versions

The following Android versions are impacted by CVE-2023-21268: 13, 12L, 12, and 11. Users of these versions are advised to take immediate action to protect their systems from potential exploitation.

Exploitation Mechanism

The exploitation of CVE-2023-21268 involves manipulating directory permissions via a path traversal error in MmsProvider.java. Attackers can leverage this vulnerability to disrupt SIM recognition on the targeted Android device, resulting in a denial of service condition.

Mitigation and Prevention

Given the severity of CVE-2023-21268, it is crucial for affected users to implement appropriate mitigation measures to safeguard their systems against potential attacks.

Immediate Steps to Take

Users should apply security patches and updates provided by Google to address the vulnerability promptly.
Implementation of security best practices, such as restricting access rights and permissions, can help mitigate the risk of exploitation.

Long-Term Security Practices

Regular security audits and vulnerability assessments can help identify and address potential weaknesses in the system.
User awareness and education on security threats and safe computing practices are essential for enhancing overall cybersecurity posture.

Patching and Updates

Google has released patches to address CVE-2023-21268. Users are strongly encouraged to update their Android devices to the latest versions to eliminate the vulnerability and enhance the security of their systems.