CVE-2020-4044 : Exploit Details and Defense Strategies
Learn about CVE-2020-4044 affecting xrdp-sesman service. Discover the impact, technical details, affected systems, and mitigation steps to prevent unauthorized access and code execution.
The xrdp-sesman service before version 0.9.13.1 is vulnerable to a buffer overflow attack, allowing local users to impersonate the service and potentially execute arbitrary code.
Understanding CVE-2020-4044
This CVE involves a security vulnerability in the xrdp-sesman service that could be exploited by local users to hijack sessions and potentially execute arbitrary code.
What is CVE-2020-4044?
The xrdp-sesman service before version 0.9.13.1 is susceptible to a buffer overflow attack when a malicious payload is supplied over port 3350. This can lead to unauthorized users starting an imposter sesman service, capturing user credentials, and hijacking sessions.
The Impact of CVE-2020-4044
- CVSS Base Score: 7.5 (High)
- Attack Vector: Network
- Availability Impact: High
- Privileges Required: None
- Scope: Unchanged
- This vulnerability poses a significant risk of unauthorized access and potential arbitrary code execution.
Technical Details of CVE-2020-4044
The technical aspects of the CVE provide insights into the vulnerability, affected systems, and exploitation mechanisms.
Vulnerability Description
- The vulnerability is classified as a stack-based buffer overflow (CWE-121).
- It allows local users to crash the xrdp-sesman service and impersonate it, potentially leading to unauthorized access and session hijacking.
Affected Systems and Versions
- Product: xrdp
- Vendor: neutrinolabs
- Versions Affected: < 0.9.13.1
Exploitation Mechanism
- Attack Complexity: Low
- User Interaction: None
- The attack can be carried out over the network without requiring any special privileges, making it a serious threat to system security.
Mitigation and Prevention
Protecting systems from CVE-2020-4044 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update xrdp to version 0.9.13.1 or newer to mitigate the vulnerability.
- Monitor network traffic for any suspicious activities on port 3350.
Long-Term Security Practices
- Implement network segmentation to limit access to critical services.
- Regularly audit and patch systems to prevent future vulnerabilities.
Patching and Updates
- Refer to vendor advisories and security announcements for patching guidance.
- Stay informed about security updates and apply them promptly to ensure system integrity and protection.