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OpenSSL: Null pointer deref in X509_issuer_and_serial_hash() (CVE-2021-23841) (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

1 year ago

Modified

Modified

1 year ago

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.

Common Vulnerabilities and Exposures (CVE)