WARNING: 2 NEW ACTIVELY EXPLOITED VULNERABILITIES AFFECT CITRIX NETSCALER ADC AND GATEWAY
Référence:
Advisory #2024-07
Logiciels concernés :
NetScaler ADC and NetScaler Gateway 14.1 before 14.1-12.35
NetScaler ADC and NetScaler Gateway 13.1 before 13.1-51.15
NetScaler ADC and NetScaler Gateway 13.0 before 13.0-92.21
NetScaler ADC 13.1-FIPS before 13.1-37.176
NetScaler ADC 12.1-FIPS before 12.1-55.302
NetScaler ADC 12.1-NDcPP before 12.1-55.302
Type:
Authenticated Remote Code Execution and Denial of Service
CVE/CVSS:
CVE-2023-6548 :CVSS 5.5(CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)
CVE-2023-6549 :CVSS 8.2(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H)
Date:
17/01/2024
Sources
Risques
Citrix has released security updates to address two vulnerabilities, that are affecting Citrix Netscaler ADC and Citrix Netscaler Gateway. The vulnerabilities are observed being exploited in attacks against organisations.
Additionally, both vulnerabilities are of low attack complexity and do not require user interaction.
Description
CVE-2023-6548: Remote code execution vulnerability
Authenticated attackers with low privileges can exploit this vulnerability if they have access to the appliance’s management interface and are able to access NetScaler IP (NSIP), Subnet IP (SNIP), or cluster management IP (CLIP).
NetScaler IP (NSIP) is the address used to access the machine for management purposes. Subnet IP (SNIP) is used for server side connections and will be used to route traffic that is destined for the VIP.
Successful exploitation of this vulnerability leads to remote code execution.
CVE-2023-6549: Denial of service vulnerability
For attackers to exploit this vulnerability, the appliance must be configured as a gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or an AAA virtual server.
Actions recommandées
Patch
The Centre for Cybersecurity Belgium strongly recommends installing updates for vulnerable devices with the highest priority, after thorough testing.
Monitor/Detect
The CCB recommends organizations upscale monitoring and detection capabilities to identify any related suspicious activity, ensuring a swift response in case of an intrusion.
In case of an intrusion, you can report an incident via: https://cert.be/en/report-incident
While patching appliances or software to the newest version may provide safety from future exploitation, it does not remediate historic compromise.