Description
The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size during validation of the ticket length, which allows remote attackers to cause a denial of service via a ticket that is too short.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openssl | 1.0.2i-1 | — |
| Debian 13 | openssl | 1.0.2i-1 | — |
| Debian 12 | openssl | 1.0.2i-1 | — |
| Debian 8 | openssl | 1.0.1t-1+deb8u4 | DSA-3673-1 |
| Debian 7 | openssl | 1.0.1t-1+deb7u1 | DLA-637-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | openssl | 1.0.2g-1ubuntu4.4 | USN-3087-1 |
| Ubuntu 14.04 LTS | openssl | 1.0.1f-1ubuntu2.20 | USN-3087-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | openssl +4 | 1:1.0.1e-51.el7_2.7 | RHSA-2016:1940 |
| RHEL 6 | openssl +3 | 1.0.1e-48.el6_8.3 | RHSA-2016:1940 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apache-commons-daemon | 1.1.0-1.redhat_2.1.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apache-commons-daemon-jsvc | 1:1.1.0-1.redhat_2.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr +1 | 1.6.3-14.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr-util +8 | 1.6.1-9.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.29-17.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_auth_kerb | 5.4-36.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_bmx | 0.9.6-17.GA.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_cluster-native | 1.3.8-1.Final_redhat_2.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +2 | 1.2.43-1.redhat_1.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_rt | 2.4.1-19.GA.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.1-23.GA.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.29-17.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-nghttp2 +1 | 1.29.0-8.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.0.2n-11.jbcs.el6 | RHSA-2018:2186, RHSA-2018:2185 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | compat-openssl098 | 0.9.8j-102.1 | SUSE-SU-2016:2468-1 |
| SLES 12 SP1 | openssl | 1.0.1i-52.1 | SUSE-SU-2016:2394-1 |
| SLES 12 | compat-openssl098 | 0.9.8j-102.1 | SUSE-SU-2016:2468-1 |
| SLES 12 | openssl | 1.0.1i-27.21.1 | SUSE-SU-2016:2387-1 |
| SLES 11 SP4 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
| SLES 11 SP3 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
| SLES 11 SP2 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 | openssl1 | 1.0.1g-0.52.1 | SUSE-SU-2016:2469-1 |
| SUSE Studio Onsite 1.3 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
| SLES for SAP 12 SP1 | compat-openssl098 | 0.9.8j-102.1 | SUSE-SU-2016:2468-1 |
| SLES for SAP 12 SP1 | openssl | 1.0.1i-52.1 | SUSE-SU-2016:2394-1 |
| SLES for SAP 12 | openssl | 1.0.1i-27.21.1 | SUSE-SU-2016:2387-1 |
| SLES for SAP 11 SP4 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
| SUSE OpenStack Cloud 5 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
| SUSE Manager Proxy 2.1 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
| SUSE Manager 2.1 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | openssl | 0.9.8j-0.102.2 | SUSE-SU-2016:2458-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-1_1 | 1.1.1l-1.2 | openSUSE-SU-2024:11127-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.8 | openssl | 1.0.2h-r3 | — |
| Alpine v3.7 | openssl | 1.0.2h-r3 | — |
| Alpine v3.6 | openssl | 1.0.2h-r3 | — |
| Alpine v3.5 | openssl | 1.0.2h-r3 | — |
| Alpine v3.4 | openssl | 1.0.2h-r3 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.3 | openssl | 1.0.2h-r3 | — |
| Alpine v3.2 | openssl | 1.0.2h-r3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | openssl +4 | 1:1.0.1e-51.el7_2.7 | ELSA-2016-1940 |
Advisories 19
- RHSA-2016:1940 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2018:2186 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 RHEL 6 security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2018:2185 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 RHEL 7 security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3087-1 openssl vulnerabilities Ubuntu Security Notices (USN) · Jun 1, 2026
- DSA-3673-1 openssl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-637-1 openssl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:2458-1 Security update for openssl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2469-1 Security update for openssl1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2468-1 Security update for compat-openssl098 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2394-1 Security update for openssl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2387-1 Security update for openssl SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2026-0180 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- WID-SEC-2024-0209 OpenSSL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2025
- openSUSE-SU-2024:11127-1 libopenssl-1_1-devel-1.1.1l-1.2 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2024-1277 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- WID-SEC-2024-0210 OpenSSL: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jan 25, 2024
- ICSA-22-349-21 Siemens SCALANCE X-200RNA Switch Devices CISA ICS & IT advisories · Dec 13, 2022
- SSA-412672 SSA-412672: Multiple OpenSSL and OpenSSH Vulnerabilities in SCALANCE X-200RNA Switch Devices before V3.2.7 Siemens ProductCERT · Dec 13, 2022
- ELSA-2016-1940 Important: openssl security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 27, 2016
References
- https://www.tenable.com/security/tns-2016-20
- RHSA-2018:2185 vendor-advisory
- RHSA-2018:2186 vendor-advisory
- http://www.splunk.com/view/SP-CAAAPUE
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- RHSA-2016:1940 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
- 92628 vdb-entry
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312
- https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=e97763c92c655dcf4af2860b3abd2bc4c8a267f9
- http://www.splunk.com/view/SP-CAAAPSV
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039
- 1036885 vdb-entry
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- https://www.tenable.com/security/tns-2016-16
- https://www.tenable.com/security/tns-2016-21
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
- http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html
- https://bto.bluecoat.com/security-advisory/sa132
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
- FreeBSD-SA-16:26 vendor-advisory
- RHSA-2018:2187 vendor-advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf