CVE-2016-7444

gnutls: Incorrect certificate validation when using OCSP responses (GNUTLS-SA-2016-3)

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The gnutls_ocsp_resp_check_crt function in lib/x509/ocsp.c in GnuTLS before 3.4.15 and 3.5.x before 3.5.4 does not verify the serial length of an OCSP response, which might allow remote attackers to bypass an intended certificate validation mechanism via vectors involving trailing bytes left by gnutls_malloc.

La función gnutls_ocsp_resp_check_crt en lib/x509/ocsp.c en GnuTLS en versiones anteriores a 3.4.15 y 3.5.x en versiones anteriores a 3.5.4 no verifica la longitud de serie de una respuesta OCSP, lo que podría permitir a atacantes remotos eludir un mecanismo de validación destinada a certificados a través de vectores que involucran bytes finales dejados por gnutls_malloc.

A flaw was found in the way GnuTLS validated certificates using OCSP responses. This could falsely report a certificate as valid under certain circumstances.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-09-09 CVE Reserved
2016-09-27 CVE Published
2023-03-07 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-264: Permissions, Privileges, and Access Controls
CWE-295: Improper Certificate Validation

CAPEC

References (8)

URL	Tag	Source
http://www.securityfocus.com/bid/92893	Vdb Entry
https://lists.gnupg.org/pipermail/gnutls-devel/2016-September/008146.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://gitlab.com/gnutls/gnutls/commit/964632f37dfdfb914ebc5e49db4fa29af35b1de9	2018-01-05

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2017-02/msg00005.html	2018-01-05
https://access.redhat.com/errata/RHSA-2017:2292	2018-01-05
https://www.gnutls.org/security.html	2018-01-05
https://access.redhat.com/security/cve/CVE-2016-7444	2017-08-01
https://bugzilla.redhat.com/show_bug.cgi?id=1374266	2017-08-01

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Gnu Search vendor "Gnu"		Gnutls Search vendor "Gnu" for product "Gnutls"				<= 3.4.14 Search vendor "Gnu" for product "Gnutls" and version " <= 3.4.14"		-		Affected
Gnu Search vendor "Gnu"		Gnutls Search vendor "Gnu" for product "Gnutls"				3.5.0 Search vendor "Gnu" for product "Gnutls" and version "3.5.0"		-		Affected
Gnu Search vendor "Gnu"		Gnutls Search vendor "Gnu" for product "Gnutls"				3.5.1 Search vendor "Gnu" for product "Gnutls" and version "3.5.1"		-		Affected
Gnu Search vendor "Gnu"		Gnutls Search vendor "Gnu" for product "Gnutls"				3.5.2 Search vendor "Gnu" for product "Gnutls" and version "3.5.2"		-		Affected
Gnu Search vendor "Gnu"		Gnutls Search vendor "Gnu" for product "Gnutls"				3.5.3 Search vendor "Gnu" for product "Gnutls" and version "3.5.3"		-		Affected