CVE-2021-26557 : Vulnerability Insights and Analysis
Learn about CVE-2021-26557, a vulnerability in Octopus Tentacle that could allow unprivileged users to gain elevated access through DLL side-loading. Find out how to mitigate this security risk.
A local privilege escalation vulnerability in Octopus Tentacle (Windows) could allow an unprivileged user to gain privileged access through DLL side-loading.
Understanding CVE-2021-26557
This CVE relates to a security issue in Octopus Tentacle that could potentially lead to unauthorized privilege escalation on Windows systems.
What is CVE-2021-26557?
CVE-2021-26557 involves incorrect folder ACL settings when Octopus Tentacle is installed in a custom folder location, potentially enabling an unprivileged user to perform DLL side-loading and elevate their privileges.
The Impact of CVE-2021-26557
The vulnerability could be exploited by an attacker to gain higher privileges than intended, posing a significant risk to system security and data integrity.
Technical Details of CVE-2021-26557
This section provides specific technical details about the CVE.
Vulnerability Description
When Octopus Tentacle is installed in a custom folder location, incorrect folder ACLs may allow an unprivileged user to use DLL side-loading for privilege escalation.
Affected Systems and Versions
- Affected Product: Octopus Tentacle
- Vendor: Octopus Deploy
- Vulnerable Versions:
- Version 3.15.4 (Custom installation)
- Versions prior to 6.0.489
Exploitation Mechanism
The vulnerability stems from misconfigured folder ACL settings during Octopus Tentacle installation, enabling DLL side-loading that could be exploited by unprivileged users.
Mitigation and Prevention
To safeguard systems from CVE-2021-26557, immediate actions and long-term security practices are recommended.
Immediate Steps to Take
- Update Octopus Tentacle to a non-vulnerable version.
- Implement strict folder ACL configurations to prevent unauthorized DLL side-loading.
Long-Term Security Practices
- Regularly monitor and update folder permissions to ensure proper security measures are in place.
- Conduct regular security assessments and audits to identify and address potential vulnerabilities.
Patching and Updates
Ensure that Octopus Tentacle is regularly updated to the latest version to mitigate known security issues and vulnerabilities.