CVE-2018-6334 : Multipart-file uploads call variables to be improperly registered in the global scope. In cases where variables are not

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).

Published 2018-12-31 19:29:00

Updated 2019-10-09 23:41:46

Source Facebook, Inc.

View at NVD, CVE.org

Vulnerability category: Input validation

Threat overview for CVE-2018-6334

Top countries where our scanners detected CVE-2018-6334

Top open port discovered on systems with this issue 80

IPs affected by CVE-2018-6334 173

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2018-6334!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2018-6334

Probability of exploitation activity in the next 30 days: 0.20%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 57 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2018-6334

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2018-6334

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Assigned by: nvd@nist.gov (Primary)
CWE-621 Variable Extraction Error

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.

Assigned by: cve-assign@fb.com (Secondary)

References for CVE-2018-6334

https://github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cff

[security][CVE-2018-6334] kill globals for file uploads in hhvm · facebook/hhvm@6937de5 · GitHub
Patch;Third Party Advisory
https://hhvm.com/blog/2018/03/30/hhvm-3.25.2.html

HHVM 3.25.2, HHVM 3.24.6, and 3.21.10 (CVE-2018-6334) | HHVM
Patch;Third Party Advisory

Products affected by CVE-2018-6334