Crystal Shard http-protection up to 0.2.0 Header X-Forwarded-For/X-Client-IP/X-Real-IP authentication spoofing

Summaryinfo

A vulnerability identified as critical has been detected in Crystal Shard http-protection up to 0.2.0. The affected element is an unknown function of the component Header Handler. Performing a manipulation of the argument X-Forwarded-For/X-Client-IP/X-Real-IP results in authentication spoofing. This vulnerability is cataloged as CVE-2020-37056. It is possible to initiate the attack remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Crystal Shard http-protection up to 0.2.0. This affects some unknown functionality of the component Header Handler. The manipulation of the argument X-Forwarded-For/X-Client-IP/X-Real-IP with an unknown input leads to a authentication spoofing vulnerability. CWE is classifying the issue as CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Crystal Shard http-protection 0.2.0 contains an IP spoofing vulnerability that allows attackers to bypass protection middleware by manipulating request headers. Attackers can hardcode consistent IP values across X-Forwarded-For, X-Client-IP, and X-Real-IP headers to circumvent security checks and gain unauthorized access.

The weakness was shared by Halis Duraki as 48533. The advisory is shared at exploit-db.com. This vulnerability is uniquely identified as CVE-2020-37056 since 01/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Exploit-DB (48533) and EUVD (EUVD-2020-30926). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Crystal Shard

Name

• http-protection

Version

• 0.1
• 0.2.0

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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