Vulnerability Details

OpenSSL: Integer overflow in CipherUpdate (CVE-2021-23840) (Linux)

Published: 2021-02-17 06:15:32
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Detection Type:
Remote Banner Unreliable

Solution Type:
Vendor Patch

Summary:
OpenSSL is prone to an integer overflow vulnerability.

Detection Method:
Checks if a vulnerable version is present on the target host.

Technical Details:
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.

Impact:
This vulnerability could cause applications to behave incorrectly or crash.

Affected Versions:
OpenSSL versions 1.0.2x and prior and 1.1.1i and prior.

Recommendations:
Update OpenSSL to version 1.0.2y, 1.1.1j or later. See the references for more details.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2021-23840

References:

https://www.openssl.org/news/secadv/20210216.txt

Severity
Medium
CVSS Score
5.0
Published
2021-02-17
Modified
2021-02-17
Category
Denial of Service

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