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OpenSSL: Integer overflow in CipherUpdate (CVE-2021-23840) (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 an integer overflow vulnerability.

Insight

Insight

Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissible length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative.

Affected Software

Affected Software

OpenSSL versions 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)