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OpenSSL: ECDSA Private Key Leak (CVE-2011-1945) - Linux
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
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.