Citrix Netscaler Application Delivery Controller/Gateway up to 10.5/11.1/12.0 TLS Handshake information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Citrix Netscaler Application Delivery Controller and Gateway up to 10.5/11.1/12.0. Impacted is an unknown function of the component TLS Handshake Handler. This manipulation causes information disclosure. This vulnerability is registered as CVE-2017-17549. Remote exploitation of the attack is possible. No exploit is available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability classified as problematic was found in Citrix Netscaler Application Delivery Controller and Gateway up to 10.5/11.1/12.0 (Network Management Software). Affected by this vulnerability is some unknown functionality of the component TLS Handshake Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.5 before build 67.13, 11.0 before build 71.22, 11.1 before build 56.19, and 12.0 before build 53.22 allow remote attackers to obtain sensitive information from the backend client TLS handshake by leveraging use of TLS with Client Certificates and a Diffie-Hellman Ephemeral (DHE) key exchange.

The bug was discovered 12/12/2017. The weakness was published 12/13/2017 by Security Team (Website). The advisory is shared at support.citrix.com. This vulnerability is known as CVE-2017-17549 since 12/11/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 105373 (Citrix NetScaler Multiple Vulnerabilities (CTX230238, CTX230612)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses and running in the context c. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370703 (Citrix NetScaler ADC and Gateway TLS Handshake Information Disclosure Vulnerability (CTX230612)).

Applying a patch is able to eliminate this problem. 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 (105373) and SecurityFocus (BID 102177†). Similar entry is available at VDB-110662. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
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: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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: 105373
Nessus Name: Citrix NetScaler Multiple Vulnerabilities (CTX230238, CTX230612)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/11/2017 🔍
12/12/2017 +1 days 🔍
12/12/2017 +0 days 🔍
12/12/2017 +0 days 🔍
12/13/2017 +1 days 🔍
12/13/2017 +0 days 🔍
12/14/2017 +1 days 🔍
12/19/2017 +5 days 🔍
01/27/2021 +1135 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: support.citrix.com
Researcher: Security Team
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-17549 (🔍)
GCVE (CVE): GCVE-0-2017-17549
GCVE (VulDB): GCVE-100-110665
SecurityFocus: 102177 - Multiple Citrix Products CVE-2017-17549 Information Disclosure Vulnerability
SecurityTracker: 1040011

See also: 🔍

Entryinfo

Created: 12/14/2017 07:54
Updated: 01/27/2021 11:37
Changes: 12/14/2017 07:54 (69), 12/15/2019 08:35 (6), 01/27/2021 11:37 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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