CVE-2016-6302

openssl: Insufficient TLS session ticket HMAC length checks

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La función tls_decrypt_ticket en ssl/t1_lib.c en OpenSSL en versiones anteriores a 1.1.0 no considera el tamaño HMAC durante la validación de la longitud del ticket, lo que permite a atacantes remotos provocar una denegación de servicio a través de un ticket que es muy corto.

An integer underflow flaw leading to a buffer over-read was found in the way OpenSSL parsed TLS session tickets. A remote attacker could use this flaw to crash a TLS server using OpenSSL if it used SHA-512 as HMAC for session tickets.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-07-26 CVE Reserved
2016-09-16 CVE Published
2024-07-09 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-125: Out-of-bounds Read

CAPEC

References (28)

URL	Tag	Source
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759	Third Party Advisory
http://www-01.ibm.com/support/docview.wss?uid=swg21995039	Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.securityfocus.com/bid/92628	Third Party Advisory
http://www.securitytracker.com/id/1036885	Vdb Entry
http://www.splunk.com/view/SP-CAAAPSV	Third Party Advisory
http://www.splunk.com/view/SP-CAAAPUE	Third Party Advisory
https://bto.bluecoat.com/security-advisory/sa132	Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=e97763c92c655dcf4af2860b3abd2bc4c8a267f9
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312	Third Party Advisory
https://www.tenable.com/security/tns-2016-16	Third Party Advisory
https://www.tenable.com/security/tns-2016-20
https://www.tenable.com/security/tns-2016-21

URL	Date	SRC

URL	Date	SRC
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html	2023-11-07
http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html	2023-11-07
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html	2023-11-07
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html	2023-11-07

URL	Date	SRC
http://rhn.redhat.com/errata/RHSA-2016-1940.html	2023-11-07
https://access.redhat.com/errata/RHSA-2018:2185	2023-11-07
https://access.redhat.com/errata/RHSA-2018:2186	2023-11-07
https://access.redhat.com/errata/RHSA-2018:2187	2023-11-07
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc	2023-11-07
https://access.redhat.com/security/cve/CVE-2016-6302	2018-07-12
https://bugzilla.redhat.com/show_bug.cgi?id=1369855	2018-07-12

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1 Search vendor "Openssl" for product "Openssl" and version "1.0.1"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1a Search vendor "Openssl" for product "Openssl" and version "1.0.1a"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1b Search vendor "Openssl" for product "Openssl" and version "1.0.1b"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1c Search vendor "Openssl" for product "Openssl" and version "1.0.1c"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1d Search vendor "Openssl" for product "Openssl" and version "1.0.1d"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1e Search vendor "Openssl" for product "Openssl" and version "1.0.1e"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1f Search vendor "Openssl" for product "Openssl" and version "1.0.1f"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1g Search vendor "Openssl" for product "Openssl" and version "1.0.1g"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1h Search vendor "Openssl" for product "Openssl" and version "1.0.1h"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1i Search vendor "Openssl" for product "Openssl" and version "1.0.1i"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1j Search vendor "Openssl" for product "Openssl" and version "1.0.1j"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1k Search vendor "Openssl" for product "Openssl" and version "1.0.1k"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1l Search vendor "Openssl" for product "Openssl" and version "1.0.1l"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1m Search vendor "Openssl" for product "Openssl" and version "1.0.1m"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1n Search vendor "Openssl" for product "Openssl" and version "1.0.1n"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1o Search vendor "Openssl" for product "Openssl" and version "1.0.1o"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1p Search vendor "Openssl" for product "Openssl" and version "1.0.1p"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1q Search vendor "Openssl" for product "Openssl" and version "1.0.1q"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1r Search vendor "Openssl" for product "Openssl" and version "1.0.1r"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1s Search vendor "Openssl" for product "Openssl" and version "1.0.1s"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1t Search vendor "Openssl" for product "Openssl" and version "1.0.1t"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2 Search vendor "Openssl" for product "Openssl" and version "1.0.2"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2a Search vendor "Openssl" for product "Openssl" and version "1.0.2a"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2b Search vendor "Openssl" for product "Openssl" and version "1.0.2b"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2c Search vendor "Openssl" for product "Openssl" and version "1.0.2c"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2d Search vendor "Openssl" for product "Openssl" and version "1.0.2d"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2e Search vendor "Openssl" for product "Openssl" and version "1.0.2e"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2f Search vendor "Openssl" for product "Openssl" and version "1.0.2f"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2g Search vendor "Openssl" for product "Openssl" and version "1.0.2g"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2h Search vendor "Openssl" for product "Openssl" and version "1.0.2h"		-		Affected
Oracle Search vendor "Oracle"		Linux Search vendor "Oracle" for product "Linux"				6 Search vendor "Oracle" for product "Linux" and version "6"		-		Affected
Oracle Search vendor "Oracle"		Linux Search vendor "Oracle" for product "Linux"				7 Search vendor "Oracle" for product "Linux" and version "7"		-		Affected
Oracle Search vendor "Oracle"		Solaris Search vendor "Oracle" for product "Solaris"				10 Search vendor "Oracle" for product "Solaris" and version "10"		-		Affected
Oracle Search vendor "Oracle"		Solaris Search vendor "Oracle" for product "Solaris"				11.3 Search vendor "Oracle" for product "Solaris" and version "11.3"		-		Affected