A flaw was found in the way the DES/3DES cipher was used as part of the TLS/SSL protocol. A man-in-the-middle attacker could use this flaw to recover some plaintext data by capturing large amounts of encrypted traffic between TLS/SSL server and client if the communication used a DES/3DES based ciphersuite.
Find out more about CVE-2016-2183 from the MITRE CVE dictionary dictionary and NIST NVD.
OpenSSL security update RHSA-2016:1940 mitigates this issue by lowering priority of DES cipher suites so they are not preferred over cipher suites using AES. For compatibility reasons, DES cipher suites remain enabled by default and included in the set of cipher suites identified by the HIGH cipher string. Future updates may move them to MEDIUM or not enable them by default.
NSS addressed this issue by implementing limits on the amount of plain text which can be encrypted by using the same key. Once the limit is reached, the keys will need to be re-negotiated manually. This change will be available in nss-3.27.
GnuTLS is not affected by this issue, since it prioritizes AES before 3DES in the cipher list.
| Base Score | 4.3 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:P/I:N/A:N |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | Partial |
| Integrity Impact | None |
| Availability Impact | None |
| CVSS3 Base Score | 3.7 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | None |
| Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat JBoss Enterprise Application Platform 6.4 | RHSA-2017:3239 | 2017-11-16 |
| Red Hat Satellite 5.6 (RHEL v.6) (java-1.7.1-ibm) | RHSA-2017:1216 | 2017-05-09 |
| Red Hat JBoss Core Services on RHEL 7 Server (jbcs-httpd24-httpd) | RHSA-2017:2709 | 2017-09-13 |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 7 Server | RHSA-2017:3113 | 2017-11-02 |
| Red Hat Enterprise Linux Supplementary (v. 6) (java-1.8.0-ibm) | RHSA-2017:0462 | 2017-03-08 |
| Red Hat Enterprise Linux Supplementary (v. 7) (java-1.7.1-ibm) | RHSA-2017:0336 | 2017-02-28 |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 6 Server | RHSA-2017:3113 | 2017-11-02 |
| Red Hat Enterprise Linux 7 (python) | RHSA-2018:2123 | 2018-07-03 |
| Red Hat Enterprise Linux Supplementary (v. 6) (java-1.7.1-ibm) | RHSA-2017:0336 | 2017-02-28 |
| Red Hat JBoss Enterprise Application Platform 6.3 for RHEL 7 Server | RHSA-2017:3240 | 2017-11-16 |
| Red Hat JBoss Enterprise Application Platform 6 for RHEL 6 Server | RHSA-2017:3240 | 2017-11-16 |
| Red Hat JBoss Core Services 1 | RHSA-2017:2708 | 2017-09-13 |
| Red Hat Enterprise Linux Supplementary 5 (java-1.7.0-ibm) | RHSA-2017:0337 | 2017-02-28 |
| Red Hat Satellite 5.7 (RHEL v.6) (java-1.7.1-ibm) | RHSA-2017:1216 | 2017-05-09 |
| Red Hat JBoss Core Services on RHEL 6 Server (jbcs-httpd24-httpd) | RHSA-2017:2710 | 2017-09-13 |
| Red Hat Enterprise Linux Supplementary 5 (java-1.6.0-ibm) | RHSA-2017:0338 | 2017-02-28 |
| Red Hat Enterprise Linux Supplementary (v. 6) (java-1.6.0-ibm) | RHSA-2017:0338 | 2017-02-28 |
| Red Hat Enterprise Linux Supplementary (v. 7) (java-1.8.0-ibm) | RHSA-2017:0462 | 2017-03-08 |
| Red Hat JBoss Web Server 2.1 | RHSA-2017:3114 | 2017-11-02 |
| Platform | Package | State |
|---|---|---|
| Red Hat OpenStack Platform 9.0 | opendaylight | Will not fix |
| Red Hat OpenStack Platform 8.0 (Liberty) | opendaylight | Will not fix |
| Red Hat OpenStack Platform 11.0 (Ocata) | opendaylight | Will not fix |
| Red Hat OpenStack Platform 10 | opendaylight | Will not fix |
| Red Hat JBoss Web Server 3.0 | openssl | Will not fix |
| Red Hat JBoss EWS 1 | openssl | Will not fix |
| Red Hat Enterprise Linux 7 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 7 | nss | Will not fix |
| Red Hat Enterprise Linux 7 | openssl | Will not fix |
| Red Hat Enterprise Linux 7 | gnutls | Not affected |
| Red Hat Enterprise Linux 6 | openssl | Will not fix |
| Red Hat Enterprise Linux 6 | gnutls | Not affected |
| Red Hat Enterprise Linux 6 | nss | Will not fix |
| Red Hat Enterprise Linux 6 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 5 | openssl | Will not fix |
| Red Hat Enterprise Linux 5 | openssl097a | Will not fix |
| Red Hat Enterprise Linux 5 | gnutls | Not affected |
| Red Hat Enterprise Linux 5 | nss | Will not fix |
1.SSL/TLS configurations should prefer AES over DES. Versions of OpenSSL shipped with Red Hat Enterprise Linux 6 and 7 already do so. In the version of OpenSSL shipped with Red Hat Enterprise Linux 5, 3DES is listed below the AES-256 cipher and above the AES-128 cipher, therefore AES-256 based ciphersuite should not be disabled on the server.
2. Servers using OpenSSL, should not disable AES-128 and AES-256 ciphersuites. Versions of Apache shipped with Red Hat Enterprise Linux use the default cipher string, in which AES is preferred over DES/3DES based ciphersuites.
For JBoss Middleware, and Java mitigations, please review this knowledge base article:
https://access.redhat.com/articles/2598471
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