Critical vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway have exposed sensitive information and a denial of service attack.
A malicious cyber actor can exploit one of these vulnerabilities to gain control of an affected machine. Citrix has published security upgrades to address the vulnerabilities impacting several products.
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With a CVSS score of 9.4, the vulnerability designated as CVE-2023–4966 is considered highly severe. Without high-level access, user involvement, or tedious processes, the weakness may be remotely exploited.
The appliance must be set up as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or an AAA virtual server to be exposed to attacks.
According to the security bulletin, this vulnerability results in “Sensitive information disclosure.”
The second vulnerability reported is CVE-2023-4967, a high-severity issue with a CVSS score of 8.2, allowing for a ‘Denial of Service attack’ on vulnerable devices.
The vulnerabilities impact the following supported versions of NetScaler ADC and NetScaler Gateway:
It is noted that NetScaler ADC and NetScaler Gateway version 12.1 are now End-of-Life (EOL) and are vulnerable.
NetScaler ADC and NetScaler Gateway version 12.1 are now End-of-Life (EOL). Customers are advised to update one of the supported versions to fix the vulnerabilities.
“Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions of NetScaler ADC and NetScaler Gateway as soon as possible,” reads Citrix’s security bulletin.
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