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OpenSSL Information Disclosure Vulnerability (20191206) - Windows

Information

Severity

Severity

Medium

Family

Family

General

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

OpenSSL is prone to an information disclosure vulnerability.

Insight

Insight

There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME.

Affected Software

Affected Software

OpenSSL version 1.0.2 through 1.0.2t and 1.1.1 through 1.1.1d.

Detection Method

Detection Method

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

Solution

Solution

Update to version 1.0.2u, 1.1.1e or later.

Common Vulnerabilities and Exposures (CVE)