#VU69135 Insufficient verification of data authenticity in Citrix Access Gateway and Citrix Netscaler ADC - CVE-2022-27513

Vulnerability identifier: #VU69135

Vulnerability risk: Medium

CVSSv4.0: 4.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-27513

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Citrix Access Gateway
Server applications / Remote management servers, RDP, SSH
Citrix Netscaler ADC
Client/Desktop applications / Software for system administration

Vendor: Citrix

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient verification of data authenticity within RDP proxy. A remote attacker can gain control over users' RDP sessions via phishing attack.

Successful exploitation of the vulnerability requires the appliance to be configured as VPN (Gateway) and RDP proxy. Also attacker should have initial access to the network via SSL-VPN gateway.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Citrix Access Gateway: before 12.1.65.21

Citrix Netscaler ADC: before 12.1-55.289

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External links
https://support.citrix.com/article/CTX463706/citrix-gateway-and-citrix-adc-security-bulletin-for-cve202227510-cve202227513-and-cve202227516

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.