CVE-2021-0399 : Exploit Details and Defense Strategies

Android kernel's qtaguid_untag in xt_qtaguid.c is vulnerable to a use after free memory corruption. This flaw could be exploited for local privilege escalation without requiring additional privileges.

Understanding CVE-2021-0399

This CVE identifies a critical vulnerability in the Android kernel that could potentially allow attackers to escalate privileges locally.

What is CVE-2021-0399?

The vulnerability lies in the qtaguid_untag function of xt_qtaguid.c and stems from a use-after-free memory corruption issue. Attackers could exploit this flaw to elevate their privileges locally without the need for additional execution privileges.

The Impact of CVE-2021-0399

If successfully exploited, this vulnerability could lead to a local escalation of privilege on affected Android systems. The exploitation does not require any user interaction, making it particularly dangerous.

Technical Details of CVE-2021-0399

This section delves into the specifics of the CVE, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from a use-after-free memory corruption in the Android kernel's qtaguid_untag function within xt_qtaguid.c. This issue could be leveraged by attackers for local privilege escalation.

Affected Systems and Versions

Affected systems include those running Android with the Android kernel version. The vulnerability poses a security risk to these specific configurations.

Exploitation Mechanism

By exploiting the use-after-free memory corruption in the qtaguid_untag function, threat actors can achieve local privilege escalation without the need for additional execution privileges.

Mitigation and Prevention

To safeguard systems against CVE-2021-0399, immediate steps should be taken following a well-rounded security approach.

Immediate Steps to Take

Users are advised to apply available security patches and updates promptly to mitigate the risk of exploitation. Additionally, implementing security best practices is crucial.

Long-Term Security Practices

Establishing robust security measures, such as access controls and system monitoring, can help prevent and detect potential privilege escalation attempts.

Patching and Updates

Regularly monitoring security bulletins and applying relevant patches from trusted sources can significantly reduce the likelihood of successful exploitation.