VDB-91385 · CVE-2016-7141 · BID 92754

cURL/libcURL up to 7.50.1 TLS Certificate lib/vtls/nss.c SelectClientCert improper authentication

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-$5k	0.00

A vulnerability was found in cURL and libcURL up to 7.50.1 (Network Utility Software). It has been rated as critical. This issue affects the function SelectClientCert in the library lib/vtls/nss.c of the component TLS Certificate Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability.

The weakness was published 09/07/2016 as Incorrect reuse of client certificates as confirmed advisory (Website). The advisory is shared at curl.haxx.se. The identification of this vulnerability is CVE-2016-7141 since 09/05/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 95917 (macOS 10.12.x < 10.12.2 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family MacOS X Local Security Checks and running in the context c. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176814 (Debian Security Update for curl (DLA 1568-1)).

Upgrading to version 7.50.2 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if(!strncmp(nickname, pem_slotname, sizeof(pem_slotname) - 1U)) {
  failf(data, "NSS: refusing previously loaded certificate from file: %s",
        nickname);
  return SECFailure;
}

The vulnerability is also documented in the vulnerability database at Tenable (95917). Similar entries are available at 87463, 90449, 91659 and 91680.

Productinfo

Type

Network Utility Software

Name

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 95917
Nessus Name: macOS 10.12.x < 10.12.2 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2016-742
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: cURL/libcURL 7.50.2
Patch: github.com

Timelineinfo

09/05/2016 🔍
09/06/2016 +1 days 🔍
09/07/2016 +1 days 🔍
09/07/2016 +0 days 🔍
09/07/2016 +0 days 🔍
09/08/2016 +1 days 🔍
10/03/2016 +25 days 🔍
12/16/2016 +74 days 🔍
09/15/2022 +2099 days 🔍

Sourcesinfo

Advisory: Incorrect reuse of client certificates
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-7141 (🔍)
SecurityTracker: 1036739
SecurityFocus: 92754 - cURL/libcURL CVE-2016-7141 Certificate Validation Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 09/08/2016 22:23
Updated: 09/15/2022 10:05
Changes: 09/08/2016 22:23 (62), 04/12/2019 09:14 (23), 09/15/2022 10:05 (5)
Complete: 🔍