In the Bouncy Castle JCE Provider version 1.55 and earlier the primary engine class used for AES was AESFastEngine. Due to the highly table driven approach used in the algorithm it turns out that if the data channel on the CPU can be monitored the lookup table accesses are sufficient to leak information on the AES key being used. There was also a leak in AESEngine although it was substantially less. AESEngine has been modified to remove any signs of leakage (testing carried out on Intel X86-64) and is now the primary AES class for the BC JCE provider from 1.56. Use of AESFastEngine is now only recommended where otherwise deemed appropriate.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2016-1000339 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue affects the versions of bouncycastle as shipped with Red Hat Subscription Asset Manager 1.x. Red Hat Product Security has rated this issue as having a security impact of Moderate. No update is planned for this product at this time. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
| CVSS3 Base Score | 5.1 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| Attack Vector | Local |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | None |
| Availability Impact | None |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Satellite 6.4 for RHEL 7 | RHSA-2018:2927 | 2018-10-16 |
| Red Hat JBoss Fuse 7 | RHSA-2018:2669 | 2018-09-11 |
| Red Hat Satellite 6.4 for RHEL 7 | RHSA-2018:2927 | 2018-10-16 |
| Platform | Package | State |
|---|---|---|
| Red Hat Virtualization 4 | eap7-bouncycastle | Not affected |
| Red Hat Subscription Asset Manager 1 | bouncycastle | Will not fix |
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-eclipse46-bouncycastle | Will not fix |
| Red Hat Single Sign-On 7 | bouncycastle | Under investigation |
| Red Hat Satellite 6 | bouncycastle | Affected |
| Red Hat OpenShift Application Runtimes 1.0 | swarm | Not affected |
| Red Hat JBoss Fuse 6 | bouncycastle | Will not fix |
| Red Hat JBoss EAP 7 | bouncycastle | Not affected |
| Red Hat JBoss Data Virtualization 6 | bouncycastle | Under investigation |
| Red Hat JBoss Data Grid 7 | bouncycastle | Under investigation |
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