Vulnerability Details

OpenSSL: ECDSA Private Key Leak (CVE-2011-1945) - Windows

Published: 2021-08-31 15:24:47
CVE Author: NIST National Vulnerability Database

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

Detection Type:
Remote Banner

Solution Type:
Vendor will not fix

Summary:
OpenSSL leaks ECDSA private key through a remote timing attack.

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

Technical Details:
The OpenSSL ladder implementation for scalar multiplication of points on elliptic curves over binary fields is susceptible to a timing attack vulnerability. This vulnerability can be used to steal the private key of a TLS server that authenticates with ECDSA signatures and binary curves.

Affected Versions:
OpenSSL through 1.0.0d.

Recommendations:
No known solution was made available for at least one year since the disclosure of this vulnerability. Likely none will be provided anymore. General solution options are to upgrade to a newer release, disable respective features, remove the product or replace the product by another one. Vendor statement: The OpenSSL team have reviewed the paper, and although the result is significant, we believe that the affected code (ECDSA used with binary curves) is very rarely used at present. We therefore do not plan on issuing a security release but expect to patch this in the future.

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

https://nvd.nist.gov/vuln/detail/CVE-2011-1945

References:

https://www.kb.cert.org/vuls/id/536044
https://eprint.iacr.org/2011/232

Severity
Low
CVSS Score
2.6
Published
2021-08-31
Modified
2021-09-03
Category
General

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