Citrix SD-WAN/Netscaler SD-WAN Certificate Validation certificate validation

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.
5.5$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Citrix SD-WAN and Netscaler SD-WAN. This impacts an unknown function of the component Certificate Validation Handler. The manipulation results in certificate validation. This vulnerability is cataloged as CVE-2019-11550. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Citrix SD-WAN and Netscaler SD-WAN (Network Management Software) (version unknown). It has been classified as critical. Affected is an unknown function of the component Certificate Validation 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. CVE summarizes:

Citrix SD-WAN 10.2.x before 10.2.1 and NetScaler SD-WAN 10.0.x before 10.0.7 have Improper Certificate Validation.

The bug was discovered 04/30/2019. The weakness was shared 05/08/2019 (Website). The advisory is shared for download at support.citrix.com. This vulnerability is traded as CVE-2019-11550 since 04/25/2019. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1587.003.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $5k-$25k.

Upgrading eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/25/2019 🔍
04/30/2019 +5 days 🔍
05/08/2019 +8 days 🔍
05/09/2019 +1 days 🔍
06/08/2020 +396 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: support.citrix.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2019-11550 (🔍)
GCVE (CVE): GCVE-0-2019-11550
GCVE (VulDB): GCVE-100-134484

Entryinfo

Created: 05/09/2019 06:59
Updated: 06/08/2020 09:51
Changes: 05/09/2019 06:59 (57), 06/08/2020 09:51 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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