THREATPORT/VULNERABILITY/CVE-2016-1000109
MEDIUM SEVERITY

CVE-2016-1000109

Hhvm vulnerability

CVSS
5.3
EPSS
5.1%
EPSS pct
91th
Exploited
No known
HHVM does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect a CGI application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue. This issue affects HHVM versions prior to 3.9.6, all versions between 3.10.0 and 3.12.4 (inclusive), and all versions between 3.13.0 and 3.14.2 (inclusive).
Affected vendor
Facebook
Affected product
Hhvm
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness type (CWE)
  • CWE-665 — Improper Initialization
Published
2020-02-19

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to integrity.

Its EPSS score of 5.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2016-1000109

  • Confirm whether Facebook Hhvm is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2016-1000109.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2016-1000109

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2016-1000109 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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