Python urllib3 Library 1.17 TLS Certificate certificate validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Python urllib3 Library 1.17. This issue affects some unknown processing of the component TLS Certificate Handler. Performing a manipulation results in certificate validation. This vulnerability is reported as CVE-2016-9015. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Python urllib3 Library 1.17 (Software Library). This affects an unknown functionality of the component TLS Certificate Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Versions 1.17 and 1.18 of the Python urllib3 library suffer from a vulnerability that can cause them, in certain configurations, to not correctly validate TLS certificates. This places users of the library with those configurations at risk of man-in-the-middle and information leakage attacks. This vulnerability affects users using versions 1.17 and 1.18 of the urllib3 library, who are using the optional PyOpenSSL support for TLS instead of the regular standard library TLS backend, and who are using OpenSSL 1.1.0 via PyOpenSSL. This is an extremely uncommon configuration, so the security impact of this vulnerability is low.

The bug was discovered 10/27/2016. The weakness was disclosed 01/11/2017 (Website). It is possible to read the advisory at openwall.com. This vulnerability is uniquely identified as CVE-2016-9015 since 10/25/2016. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 94346 (FreeBSD : urllib3 -- certificate verification failure (c5c6e293-9cc7-11e6-823f-b8aeed92ecc4)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172068 (OpenSUSE Security Update for python-urllib3 (openSUSE-SU-2019:0159-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (94346) and SecurityFocus (BID 93941†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 3.7
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 94346
Nessus Name: FreeBSD : urllib3 -- certificate verification failure (c5c6e293-9cc7-11e6-823f-b8aeed92ecc4)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/25/2016 🔍
10/27/2016 +2 days 🔍
10/27/2016 +0 days 🔍
10/28/2016 +1 days 🔍
10/28/2016 +0 days 🔍
01/11/2017 +75 days 🔍
01/11/2017 +0 days 🔍
01/11/2017 +0 days 🔍
07/19/2020 +1285 days 🔍

Sourcesinfo

Advisory: openwall.com
Status: Not defined

CVE: CVE-2016-9015 (🔍)
GCVE (CVE): GCVE-0-2016-9015
GCVE (VulDB): GCVE-100-95187
SecurityFocus: 93941 - Python urllib3 CVE-2016-9015 TLS Certificate Validation Security Bypass Vulnerability
OSVDB: - CVE-2016-9015 - Python - urllib3 - Man-in-the-Middle Issue

Entryinfo

Created: 01/11/2017 21:05
Updated: 07/19/2020 15:00
Changes: 01/11/2017 21:05 (67), 07/19/2020 15:00 (7)
Complete: 🔍
Cache ID: 216:376:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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