#VU25818 Inconsistent interpretation of HTTP requests in Citrix NetScaler Gateway - CVE-2020-10111

Vulnerability identifier: #VU25818

Vulnerability risk: Low

CVSSv4.0: 2.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2020-10111

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 poising attacks.

The vulnerability exists due to incorrect processing of HTTP requests with different HTTP protocol versions. A remote attacker can send a specially crafted HTTP request and posing the HTTP cache.

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
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-006.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.