CVE-2020-27348 : Security Advisory and Response
Learn about CVE-2020-27348 affecting snapcraft versions < 4.4.4, < 2.43.1+16.04.1, and < 2.43.1+18.04.1. Discover the impact, exploitation mechanism, and mitigation steps.
A vulnerability in snapcraft could allow a malicious snap package to execute code within the context of another snap, affecting certain versions of snapcraft.
Understanding CVE-2020-27348
This CVE involves a security issue in snapcraft that could lead to code execution by a malicious snap package.
What is CVE-2020-27348?
In specific conditions, snap packages built by snapcraft may include the current directory in LD_LIBRARY_PATH. This could enable a malicious snap to execute code within the context of another snap if both have access to the home interface or similar permissions. The affected versions include snapcraft versions prior to 4.4.4, 2.43.1+16.04.1, and 2.43.1+18.04.1.
The Impact of CVE-2020-27348
The vulnerability has a CVSS base score of 6.8, indicating a medium severity issue. It has a low attack complexity and vector, but high impacts on confidentiality and integrity. The exploit requires user interaction and low privileges.
Technical Details of CVE-2020-27348
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability allows a malicious snap package to gain code execution within the context of another snap by manipulating LD_LIBRARY_PATH.
Affected Systems and Versions
- Product: snapcraft
- Vendor: Canonical
- Affected Versions:
- snapcraft < 4.4.4
- snapcraft < 2.43.1+16.04.1
- snapcraft < 2.43.1+18.04.1
Exploitation Mechanism
The vulnerability occurs when a snap package built by snapcraft includes the current directory in LD_LIBRARY_PATH, enabling code execution by a malicious snap.
Mitigation and Prevention
Protect your systems from CVE-2020-27348 with the following steps:
Immediate Steps to Take
- Update snapcraft to version 4.4.4 or higher.
- Monitor for any unusual snap package behavior.
Long-Term Security Practices
- Regularly update snapcraft and other software components.
- Implement least privilege access controls to limit the impact of potential exploits.
Patching and Updates
- Apply patches provided by Canonical promptly.