A timing attack flaw was found in OpenSSL that could allow a malicious user with local access to recover ECDSA P-256 private keys.
Find out more about CVE-2016-7056 from the MITRE CVE dictionary dictionary and NIST NVD.
In order to exploit this flaw, the attacker needs to be have local (shell) access to the machine where the message is being signed using the ECDSA algorithm with a P-256 elliptic curve key. Then using cache timing attacks (which needs precise timing), on multiple signature runs, the private key could be obtained. Based on the factor that exploitation is difficult, Red Hat Product Security Team has rated this flaw as having Moderate impact. A further security release may address this flaw.
| 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 | Errata | Release Date |
|---|---|---|
| Red Hat JBoss Core Services on RHEL 6 Server | RHSA-2017:1414 | 2017-06-07 |
| Red Hat JBoss Web Server 3.1 | RHSA-2017:1802 | 2017-07-25 |
| Red Hat JBoss Core Services 1 | RHSA-2017:1415 | 2017-06-07 |
| Red Hat JBoss Core Services on RHEL 7 Server | RHSA-2017:1413 | 2017-06-07 |
| Red Hat JBoss Web Server 3.1 for RHEL 6 | RHSA-2017:1801 | 2017-07-25 |
| Red Hat JBoss Web Server 3.1 for RHEL 7 | RHSA-2017:1801 | 2017-07-25 |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss EWS 2 | openssl | Not affected |
| Red Hat JBoss EWS 1 | openssl | Will not fix |
| Red Hat JBoss EAP 6 | openssl | Not affected |
| Red Hat Enterprise Linux 7 | openssl098e | Not affected |
| Red Hat Enterprise Linux 7 | openssl | Will not fix |
| Red Hat Enterprise Linux 6 | openssl | Will not fix |
| Red Hat Enterprise Linux 6 | openssl098e | Not affected |
| Red Hat Enterprise Linux 5 | openssl | Not affected |
| Red Hat Enterprise Linux 5 | openssl097a | Not affected |
| RHEV Manager 3 | mingw-virt-viewer | Will not fix |
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