Citrix NetScaler ADC/NetScaler Gateway code injection

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.7$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Citrix NetScaler ADC and NetScaler Gateway. Affected is an unknown function. The manipulation leads to code injection. This vulnerability is documented as CVE-2023-3519. The attack can be initiated remotely. Additionally, an exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Citrix NetScaler ADC and NetScaler Gateway (Connectivity Software) (affected version unknown). It has been rated as very critical. This issue affects an unknown functionality. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability.

The weakness was released 07/18/2023 by Wouter Rijkbost and Jorren Geurts as CTX561482. It is possible to read the advisory at support.citrix.com. The identification of this vulnerability is CVE-2023-3519. Technical details are unknown but an exploit is available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/09/2024). The attack technique deployed by this issue is T1059 according to MITRE ATT&CK. The advisory points out:

Appliance must be configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

It is declared as attacked. We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 178442 , which helps to determine the existence of the flaw in a target environment. The advisory illustrates:

Exploits of CVE-2023-3519 on unmitigated appliances have been observed. Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible.
The CISA Known Exploited Vulnerabilities Catalog lists this issue since 07/19/2023 with a due date of 08/09/2023:
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Zero-Day.cz (793) and Tenable (178442). helpnetsecurity.com is providing further details. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.7

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Citrix): 9.8
Vendor Vector (Citrix): 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Code injection
CWE: CWE-94 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 178442

Zero-Day.cz: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/05/2023 🔍
07/18/2023 +13 days 🔍
07/18/2023 +0 days 🔍
09/09/2024 +419 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: CTX561482
Researcher: Wouter Rijkbost, Jorren Geurts
Status: Confirmed

CVE: CVE-2023-3519 (🔍)
GCVE (CVE): GCVE-0-2023-3519
GCVE (VulDB): GCVE-100-234431
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍

Entryinfo

Created: 07/18/2023 18:44
Updated: 09/09/2024 22:30
Changes: 07/18/2023 18:44 (37), 07/19/2023 15:20 (4), 07/19/2023 15:36 (6), 07/19/2023 16:00 (10), 08/09/2023 14:38 (1), 04/29/2024 09:06 (24), 06/09/2024 06:39 (2), 06/28/2024 05:32 (19), 09/09/2024 22:30 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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