CVE-2017-3733

Encrypt-Then-Mac renegotiation crash

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake (or vice-versa) then this can cause OpenSSL 1.1.0 before 1.1.0e to crash (dependent on ciphersuite). Both clients and servers are affected.

Durante un protocolo de enlace de renegociación, si la extensión Encrypt-Then-Mac es negociada cuando no estaba en el protocolo de enlace original (o viceversa), se podría provocar el cierre inesperado de OpenSSL (dependiente de una suite de cifrado) en versiones 1.1.0 anteriores a la 1.1.0e. Tanto los clientes como los servidores se ven afectados.

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake (or vice-versa) then this can cause OpenSSL to crash (dependent on ciphersuite). Both clients and servers are affected.

*Credits: Joe Orton (Red Hat)

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

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-12-16 CVE Reserved
2017-02-16 CVE Published
2024-09-16 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (8)

URL	Tag	Source
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html	X_refsource_confirm
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html	X_refsource_confirm
http://www.securityfocus.com/bid/96269	Third Party Advisory
http://www.securitytracker.com/id/1037846	Vdb Entry
https://github.com/openssl/openssl/commit/4ad93618d26a3ea23d36ad5498ff4f59eff3a4d2	X_refsource_misc
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03728en_us	Third Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html	X_refsource_misc

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.openssl.org/news/secadv/20170216.txt	2019-04-23

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"				1.1.0 Search vendor "Openssl" for product "Openssl" and version "1.1.0"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.1.0a Search vendor "Openssl" for product "Openssl" and version "1.1.0a"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.1.0b Search vendor "Openssl" for product "Openssl" and version "1.1.0b"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.1.0c Search vendor "Openssl" for product "Openssl" and version "1.1.0c"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.1.0d Search vendor "Openssl" for product "Openssl" and version "1.1.0d"		-		Affected
Hp Search vendor "Hp"		Operations Agent Search vendor "Hp" for product "Operations Agent"				11.14 Search vendor "Hp" for product "Operations Agent" and version "11.14"		-		Affected
Hp Search vendor "Hp"		Operations Agent Search vendor "Hp" for product "Operations Agent"				11.15 Search vendor "Hp" for product "Operations Agent" and version "11.15"		-		Affected