GnuTLS up to 3.4.14/3.5.3 OCSP Response Length lib/x509/ocsp.c gnutls_ocsp_resp_check_crt access control

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in GnuTLS up to 3.4.14/3.5.3 and classified as critical. This affects the function gnutls_ocsp_resp_check_crt in the library lib/x509/ocsp.c of the component OCSP Response Length Handler. This manipulation causes access control. This vulnerability is handled as CVE-2016-7444. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in GnuTLS up to 3.4.14/3.5.3 (Network Encryption Software). It has been declared as critical. Affected by this vulnerability is the function gnutls_ocsp_resp_check_crt in the library lib/x509/ocsp.c of the component OCSP Response Length Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 09/27/2016 (Website). The advisory is shared at gitlab.com. This vulnerability is known as CVE-2016-7444 since 09/09/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 94844 (Fedora 25 : mingw-gnutls (2016-a1e5b2331a)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157522 (Oracle Enterprise Linux Security Update for gnutls (ELSA-2017-2292)).

Upgrading to version 3.4.15 or 3.5.4 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (94844) and SecurityFocus (BID 92893†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 94844
Nessus Name: Fedora 25 : mingw-gnutls (2016-a1e5b2331a)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 871165
OpenVAS Name: RedHat Update for gnutls RHSA-2017:2292-01
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: GnuTLS 3.4.15/3.5.4
Patch: gitlab.com

Timelineinfo

09/02/2016 🔍
09/09/2016 +7 days 🔍
09/14/2016 +5 days 🔍
09/27/2016 +13 days 🔍
09/27/2016 +0 days 🔍
09/28/2016 +1 days 🔍
11/15/2016 +48 days 🔍
09/21/2022 +2136 days 🔍

Sourcesinfo

Advisory: RHSA-2017:2292
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-7444 (🔍)
GCVE (CVE): GCVE-0-2016-7444
GCVE (VulDB): GCVE-100-92221
SecurityFocus: 92893 - GnuTLS GNUTLS-SA-2016-3 Certificate Validation Security Bypass Vulnerability

Entryinfo

Created: 09/28/2016 09:12
Updated: 09/21/2022 14:36
Changes: 09/28/2016 09:12 (66), 04/27/2019 09:27 (13), 09/21/2022 14:36 (5)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!