CVE-2020-5202 : Vulnerability Insights and Analysis

Apt-cacher-ng through version 3.3 has a vulnerability that allows local users to access sensitive information by hijacking the hardcoded TCP port.

Understanding CVE-2020-5202

This CVE involves a security issue in apt-cacher-ng that could lead to a potential leak of sensitive data to unprivileged local users.

What is CVE-2020-5202?

The vulnerability in apt-cacher-ng allows local users to obtain sensitive information by taking control of the hardcoded TCP port. This can result in the leakage of confidential data to unauthorized users.

The Impact of CVE-2020-5202

The vulnerability enables local users to impersonate the apt-cacher-ng daemon, potentially leading to a leak of credentials and other sensitive data.

Technical Details of CVE-2020-5202

Apt-cacher-ng through version 3.3 is susceptible to a security flaw that can be exploited by local users.

Vulnerability Description

The /usr/lib/apt-cacher-ng/acngtool program connects to apt-cacher-ng via TCP on localhost port 3142, allowing local users to intercept sensitive data.
The cron job /etc/cron.daily/apt-cacher-ng periodically attempts to connect to apt-cacher-ng, creating a potential security risk.

Affected Systems and Versions

Product: n/a
Vendor: n/a
Versions affected: All versions up to and including 3.3

Exploitation Mechanism

Local users can hijack the hardcoded TCP port 3142, intercepting requests from acngtool and potentially accessing sensitive data.
If AdminAuth is enabled in /etc/apt-cacher-ng/security.conf, even more critical data can be leaked.

Mitigation and Prevention

To address CVE-2020-5202, follow these steps:

Immediate Steps to Take

Disable apt-cacher-ng if not essential for operations.
Monitor network traffic for any suspicious activity.
Implement strict access controls to limit unauthorized access.

Long-Term Security Practices

Regularly update apt-cacher-ng to the latest version to patch known vulnerabilities.
Conduct security audits to identify and address any potential weaknesses in the system.

Patching and Updates

Apply patches provided by the vendor promptly to mitigate the vulnerability.