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OpenSSL Encrypt-Then-Mac Extension Denial of Service Vulnerability (Windows)
Information
Severity
Severity
Medium
Family
Family
Denial of Service
CVSSv2 Base
CVSSv2 Base
5.0
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Solution Type
Solution Type
Vendor Patch
Created
Created
6 years ago
Modified
Modified
4 years ago
Summary
This host is running OpenSSL and is prone to denial of service vulnerability.
Insight
Insight
The flaw exists, during a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake (or vice-versa) then this can cause OpenSSL to crash (dependent on ciphersuite).
Affected Software
Affected Software
OpenSSL version 1.1.0 on Windows
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Upgrade to OpenSSL version 1.1.0e or later.