CVE-2016-6304
A memory leak flaw was found in the way OpenSSL handled TLS status request extension data during session renegotiation. A remote attacker could cause a TLS server using OpenSSL to consume an excessive amount of memory and, possibly, exit unexpectedly after exhausting all available memory, if it enabled OCSP stapling support.
Find out more about CVE-2016-6304 from the MITRE CVE dictionary dictionary and NIST NVD.
Statement
TLS server applications using OpenSSL versions in Red Hat Enterprise Linux 6 and 7 are only affected if they enable OCSP stapling support. Applications not enabling OCSP stapling support are not affected. Few applications implement OCSP stapling support and typically do not enable it by default.
CVSS v2 metrics
| Base Score | 5 |
|---|---|
| Base Metrics | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| Access Vector | Network |
| Access Complexity | Low |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Partial |
CVSS v3 metrics
| CVSS3 Base Score | 7.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Red Hat Security Errata
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat JBoss Enterprise Application Platform 6.4 | RHSA-2017:1659 | 2017-06-28 |
| Red Hat JBoss Enterprise Application Platform 6 for RHEL 6 Server (jbcs-httpd24-openssl) | RHSA-2017:1658 | 2017-06-28 |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 6 Server | RHSA-2017:2493 | 2017-08-21 |
| Red Hat JBoss Core Services on RHEL 6 Server | RHSA-2017:1414 | 2017-06-07 |
| Red Hat Enterprise Linux Advanced Update Support 6.5 (openssl) | RHSA-2016:2802 | 2016-11-17 |
| Red Hat Enterprise Linux 6 (openssl) | RHSA-2016:1940 | 2016-09-27 |
| Red Hat JBoss Web Server 3.1 for RHEL 6 | RHSA-2017:1801 | 2017-07-25 |
| Red Hat Enterprise Linux Advanced Update Support 6.6 (openssl) | RHSA-2016:2802 | 2016-11-17 |
| Red Hat Enterprise Linux Advanced Update Support 6.2 (openssl) | RHSA-2016:2802 | 2016-11-17 |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 7 Server | RHSA-2017:2493 | 2017-08-21 |
| 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 Enterprise Linux Server TUS (v. 6.6) (openssl) | RHSA-2016:2802 | 2016-11-17 |
| Red Hat Enterprise Linux Server TUS (v. 6.5) (openssl) | RHSA-2016:2802 | 2016-11-17 |
| Red Hat Enterprise Linux 7 (openssl) | RHSA-2016:1940 | 2016-09-27 |
| Red Hat JBoss Core Services on RHEL 7 Server | RHSA-2017:1413 | 2017-06-07 |
| Red Hat JBoss Web Server 2.1 | RHSA-2017:2494 | 2017-08-21 |
| Red Hat JBoss Web Server 3.1 for RHEL 7 | RHSA-2017:1801 | 2017-07-25 |
| Red Hat JBoss Enterprise Application Platform 6.3 for RHEL 7 Server (jbcs-httpd24-openssl) | RHSA-2017:1658 | 2017-06-28 |
| Red Hat Enterprise Linux Advanced Update Support 6.4 (openssl) | RHSA-2016:2802 | 2016-11-17 |
| Red Hat Enterprise Linux Extended Update Support 6.7 (openssl) | RHSA-2016:2802 | 2016-11-17 |
Affected Packages State
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss Web Server 3.0 | openssl | Fix deferred |
| Red Hat JBoss EWS 1 | openssl | Will not fix |
| Red Hat JBoss EAP 5 | openssl | Under investigation |
| Red Hat Enterprise Linux 7 | openssl098e | Not affected |
| Red Hat Enterprise Linux 6 | openssl098e | Not affected |
| Red Hat Enterprise Linux 5 | openssl | Not affected |
| Red Hat Enterprise Linux 5 | openssl097a | Not affected |
| Red Hat Enterprise Linux 4 | openssl | Not affected |