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

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).

CRITICAL · CVSS 9.8 EPSS 0.0063
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
CWE-621Variable Extraction Error
▤

Affected Products & Versions

3
facebook hhvm<= 3.21.9
facebook hhvm>= 3.21.10 and <= 3.24.5
facebook hhvm>= 3.24.6 and <= 3.25.1
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve-assign@fb.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD31 Dec 2018 · 07:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cffPatchThird Party Advisory
https://hhvm.com/blog/2018/03/30/hhvm-3.25.2.htmlPatchThird Party Advisory
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