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OpenSSL: Null pointer deref in X509_issuer_and_serial_hash() (CVE-2021-23841) (Linux)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
OpenSSL is prone to a denial of service (DoS) vulnerability.
Insight
Insight
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed).
Affected Software
Affected Software
OpenSSL version 1.0.2x and prior and 1.1.1i and prior.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update OpenSSL to version 1.0.2y, 1.1.1j or later. See the references for more details.