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

Information

Severity

Severity

Low

Family

Family

General

CVSSv2 Base

CVSSv2 Base

2.6

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Wont Fix

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

OpenSSL leaks ECDSA private key through a remote timing attack.

Insight

Insight

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 Software

Affected Software

OpenSSL through 1.0.0d.

Detection Method

Detection Method

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

Solution

Solution

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.

Common Vulnerabilities and Exposures (CVE)