CVE-2020-12878 : Security Advisory and Response

Digi ConnectPort X2e before 3.2.30.6 allows an attacker to escalate privileges from the python user to root via a symlink attack that uses chown, related to /etc/init.d/S50dropbear.sh and the /WEB/python/.ssh directory.

Understanding CVE-2020-12878

This CVE involves a vulnerability in Digi ConnectPort X2e that allows privilege escalation through a symlink attack.

What is CVE-2020-12878?

CVE-2020-12878 is a security vulnerability in Digi ConnectPort X2e devices that enables an attacker to elevate their privileges from a regular user to root using a specific symlink attack.

The Impact of CVE-2020-12878

The vulnerability poses a significant risk as it allows unauthorized users to gain root access, potentially leading to complete system compromise and unauthorized control.

Technical Details of CVE-2020-12878

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability in Digi ConnectPort X2e before version 3.2.30.6 allows an attacker to exploit a symlink attack involving chown, specifically related to /etc/init.d/S50dropbear.sh and the /WEB/python/.ssh directory.

Affected Systems and Versions

Affected Product: Digi ConnectPort X2e
Vulnerable Versions: Before 3.2.30.6

Exploitation Mechanism

The exploitation involves manipulating symbolic links to escalate privileges from the python user to root, taking advantage of the chown function and specific directories.

Mitigation and Prevention

Protecting systems from CVE-2020-12878 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Digi ConnectPort X2e devices to version 3.2.30.6 or newer to mitigate the vulnerability.
Monitor system logs for any suspicious symlink activities.

Long-Term Security Practices

Implement the principle of least privilege to restrict user permissions.
Regularly audit and review file and directory permissions to prevent unauthorized changes.

Patching and Updates

Stay informed about security updates and patches released by Digi for the ConnectPort X2e series.
Apply patches promptly to ensure systems are protected against known vulnerabilities.