#VU81927 Buffer overflow in Citrix Netscaler ADC and Citrix NetScaler Gateway - CVE-2023-4967

Vulnerability identifier: #VU81927

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-4967

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Citrix Netscaler ADC
Client/Desktop applications / Software for system administration
Citrix NetScaler Gateway
Server applications / Application servers

Vendor: Citrix

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error. A remote non-authenticated attacker can send specially crafted data to the device, trigger memory corruption and perform a denial of service (DoS) attack.

Successful exploitation of this vulnerability requires that the appliance is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or as AAAvirtualserver.

Mitigation

Install updates from vendor's website.

For FIPS releases install the following versions:

• NetScaler ADC 13.1-FIPS version 13.1-37.164
• NetScaler ADC 12.1-FIPS version 12.1-55.300
• NetScaler ADC 12.1-NDcPP version 12.1-55.300

Vulnerable software versions

Citrix Netscaler ADC: 12.1-55.289 - 14.1-4.42

Citrix NetScaler Gateway: 12.1-55.289 - 14.1-4.42

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External links
https://support.citrix.com/article/CTX579459

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?