HHVM up to 3.21.9/3.24.5/3.25.1 Multipart File Upload Variable variable extraction error

Summaryinfo

A vulnerability was found in HHVM up to 3.21.9/3.24.5/3.25.1. It has been rated as critical. The impacted element is an unknown function of the component Multipart File Upload. The manipulation as part of Variable leads to input validation. This vulnerability is uniquely identified as CVE-2018-6334. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in HHVM up to 3.21.9/3.24.5/3.25.1 and classified as very critical. This issue affects an unknown function of the component Multipart File Upload. The manipulation as part of a Variable leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-621. The product uses external input to determine the names of variables into which information is extracted, without verifying that the names of the specified variables are valid. This could cause the program to overwrite unintended variables. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Multipart-file uploads call variables to be improperly registered in the global scope. In cases where variables are not declared explicitly before being used this can lead to unexpected behavior. This affects all supported versions of HHVM prior to the patch (3.25.1, 3.24.5, and 3.21.9 and below).

The bug was discovered 03/30/2018. The weakness was disclosed 12/31/2018 (Website). The advisory is shared at github.com. The identification of this vulnerability is CVE-2018-6334 since 01/26/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/06/2025).

The vulnerability was handled as a non-public zero-day exploit for at least 276 days. During that time the estimated underground price was around $0-$5k.

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

The entries VDB-128601, VDB-128600 and VDB-128598 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• HHVM

Version

• 3.21.0
• 3.21.1
• 3.21.2
• 3.21.3
• 3.21.4
• 3.21.5
• 3.21.6
• 3.21.7
• 3.21.8
• 3.21.9
• 3.24.0
• 3.24.1
• 3.24.2
• 3.24.3
• 3.24.4
• 3.24.5
• 3.25.0
• 3.25.1

License

• open-source

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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