Vulnerability identifier: #VU25817

Vulnerability risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:U/RC:C]

CVE-ID: CVE-2020-10112

CWE-ID: CWE-444

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Citrix NetScaler Gateway
Server applications / Application servers

Vendor: Citrix

Description

The vulnerability allows a remote attacker to perform cache poisoning attacks.

The vulnerability exists due to incorrect processing of HTTP requests that rely on HTTP parameter values. If a client is requesting a URL with parameter "value=A", the parameter will be processed and the response will be cached.  If another client is requesting the same URL but with a different parameter "value=B", the request will be answered with the initial response ("value=A") during the caching time (for 112 seconds).

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Citrix NetScaler Gateway: 11.1.41.26 - 12.1.55.18

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External links
http://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-005.txt

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.