CVE-2020-28407 : Vulnerability Insights and Analysis

A vulnerability in swtpm versions before 0.4.2 and 0.5.x before 0.5.1 could allow a local attacker to overwrite arbitrary files through a symlink attack.

Understanding CVE-2020-28407

This CVE identifies a security issue in swtpm versions prior to 0.4.2 and 0.5.x before 0.5.1 that could be exploited by a local attacker.

What is CVE-2020-28407?

The vulnerability in swtpm versions before 0.4.2 and 0.5.x before 0.5.1 enables a local attacker to potentially overwrite arbitrary files using a symlink attack against temporary files.

The Impact of CVE-2020-28407

The exploitation of this vulnerability could lead to unauthorized modification of critical system files, potentially compromising the integrity and security of the affected system.

Technical Details of CVE-2020-28407

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability allows a local attacker to perform symlink attacks on temporary files like TMP2-00.permall, leading to the overwrite of arbitrary files.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions:
swtpm versions before 0.4.2
swtpm versions 0.5.x before 0.5.1

Exploitation Mechanism

The vulnerability can be exploited through a symlink attack on specific temporary files within the swtpm software, enabling the attacker to overwrite files.

Mitigation and Prevention

Protecting systems from CVE-2020-28407 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update swtpm to version 0.4.2 or 0.5.1 to mitigate the vulnerability.
Regularly monitor and audit file permissions to detect unauthorized changes.

Long-Term Security Practices

Implement the principle of least privilege to restrict access to critical files.
Educate users on safe file handling practices to prevent symlink attacks.

Patching and Updates

Apply patches provided by swtpm promptly to address the vulnerability and enhance system security.