Impact: Moderate Public Date: 2019-09-10 CWE: CWE-602 Bugzilla: 1752090: CVE-2019-1547 openssl: side-channel weak encryption vulnerability 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).
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2019-1547 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 5.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | None |
| Availability Impact | None |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss Web Server 5 | openssl | Under investigation |
| Red Hat JBoss Web Server 3 | openssl | Under investigation |
| Red Hat JBoss EWS 2 | openssl | Under investigation |
| Red Hat JBoss EAP 6 | openssl | Under investigation |
| Red Hat JBoss EAP 5 | openssl | Under investigation |
| Red Hat JBoss Core Services 1 | openssl | Under investigation |
| Red Hat Enterprise Linux 8 | openssl | Under investigation |
| Red Hat Enterprise Linux 8 | mingw-openssl | Under investigation |
| Red Hat Enterprise Linux 7 | openssl | Under investigation |
| Red Hat Enterprise Linux 6 | openssl | Under investigation |
| Red Hat Enterprise Linux 5 | openssl | Under investigation |
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