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CVE-2019-1547

CVE information

Published

4 years ago

Last Modified

5 months ago

CVSSv2.0 Severity

Low

CVSSv3.1 Severity

Medium

Impact Analysis

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Description

Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s)..

CVSSv2.0 Score

Severity
Low
Base Score
1.9/10
Exploit Score
3.4/10
Access Vector
Local
Access Complexity
Medium
Authentication Required
None
Impact Score
2.9/10
Confidentiality Impact
Partial
Availability Impact
None
Integrity Impact
None

CVSSv3.1 Score

Severity
Medium
Base Score
4.7/10
Exploit Score
1/10
Access Vector
Local
Access Complexity
High
Privileges Required
Low
Impact Score
3.6/10
Confidentiality Impact
High
Availability Impact
None
Integrity Impact
None
Scope
Unchanged
User Interaction
None

Products Affected

CPE Affected Vulnerable Excluding Edit
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
  Yes
1.1.1 -
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
  Yes
1.0.2 -
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
  Yes
1.1.0 -

References