CVE-2018-16793 : Security Advisory and Response
Learn about CVE-2018-16793, an SSRF vulnerability in Microsoft Exchange Server 2010 SP3 and earlier versions. Find out the impact, affected systems, exploitation, and mitigation steps.
An SSRF vulnerability has been identified in the username parameter of /owa/auth/logon.aspx on the OWA (Outlook Web Access) login page for Microsoft Exchange Server 2010 SP3 and older versions, specifically in Rollup 18.
Understanding CVE-2018-16793
This CVE involves a Server-Side Request Forgery (SSRF) vulnerability affecting Microsoft Exchange Server 2010 SP3 and earlier versions.
What is CVE-2018-16793?
CVE-2018-16793 is an SSRF vulnerability found in the username parameter of the OWA login page for Microsoft Exchange Server 2010 SP3 and prior versions, particularly in Rollup 18.
The Impact of CVE-2018-16793
This vulnerability could allow an attacker to send crafted requests from the server, potentially leading to unauthorized access to internal systems or services.
Technical Details of CVE-2018-16793
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The SSRF vulnerability in Microsoft Exchange Server 2010 SP3 and earlier versions arises from improper handling of user-supplied input in the username parameter of /owa/auth/logon.aspx.
Affected Systems and Versions
- Microsoft Exchange Server 2010 SP3
- Older versions with Rollup 18
Exploitation Mechanism
Attackers can exploit this vulnerability by manipulating the username parameter to send malicious requests to internal resources, potentially bypassing security controls.
Mitigation and Prevention
Protecting systems from CVE-2018-16793 requires immediate actions and long-term security measures.
Immediate Steps to Take
- Apply security patches provided by Microsoft to address the SSRF vulnerability.
- Monitor network traffic for any suspicious activity targeting the affected systems.
Long-Term Security Practices
- Implement strict input validation mechanisms to prevent SSRF attacks.
- Conduct regular security assessments and penetration testing to identify and remediate vulnerabilities.
Patching and Updates
Regularly update and patch Microsoft Exchange Server to ensure that known vulnerabilities, including SSRF issues, are mitigated effectively.