CVE-2021-41556 Explained : Impact and Mitigation
Learn about CVE-2021-41556, a vulnerability in Squirrel allowing out-of-bounds reads that may lead to Code Execution. Find mitigation steps and affected versions.
Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read in sqclass.cpp, potentially leading to Code Execution.
Understanding CVE-2021-41556
What is CVE-2021-41556?
sqclass.cpp in Squirrel allows an out-of-bounds read in the core interpreter, potentially enabling an attacker to execute code and break out of the sandbox.
The Impact of CVE-2021-41556
The vulnerability can be exploited by executing an attacker-controlled squirrel script, bypassing security restrictions and potentially leading to malicious activities such as targeting Cloud services or distributing malware.
Technical Details of CVE-2021-41556
Vulnerability Description
The flaw in Squirrel's sqclass.cpp permits an out-of-bounds read, creating a pathway for Code Execution.
Affected Systems and Versions
- Squirrel through version 2.2.5 and 3.x through 3.1
Exploitation Mechanism
- Attacker executes a malicious squirrel script to trigger the out-of-bounds read
Mitigation and Prevention
Immediate Steps to Take
- Update Squirrel to the latest patched versions
- Avoid executing untrusted squirrel scripts
Long-Term Security Practices
- Implement strict input validation in scripts
- Regular security assessments and audits
Patching and Updates
- Apply security patches promptly to mitigate the vulnerability