Skip to main content

Os X Server CVE-2016-4694

CRITICAL
Improper Access Control (CWE-284)
2016-09-25 product-security@apple.com
Authentication Bypass Apache Apple Mac Os X Os X Server
9.1
CVSS 3.0 · NVD
View

Vulnerability Assessment

Weakness
CWE
CWE-284
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Sign in to read
Impact

CVSS score of 9.1 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.96%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 1.0% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

The Apache HTTP Server in Apple OS X before 10.12 and OS X Server before 5.2 follows RFC 3875 section 4.1.18 and therefore does not protect applications from the presence of untrusted CGI client data. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Sign in to check
Technical ContextAI · show details

This vulnerability is classified under CWE-284. The Apache HTTP Server in Apple OS X before 10.12 and OS X Server before 5.2 follows RFC 3875 section 4.1.18 and therefore does not protect applications from the presence of untrusted CGI client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect an application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue, a related issue to CVE-2016-5387. Affected products include: Apple Mac Os X, Apple Os X Server. Version information: before 10.12.

Know when Os X Server gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources
Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

DescriptionCVE.org

The Apache HTTP Server in Apple OS X before 10.12 and OS X Server before 5.2 follows RFC 3875 section 4.1.18 and therefore does not protect applications from the presence of untrusted CGI client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect an application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue, a related issue to CVE-2016-5387.

Threat Intelligence Overview

EPSS Score
1.0%
Top 23% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 1.0%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

47
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +46
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:os_x_server:*:*:*:*:*:*:*:*

More in Os X Server

View all
CVE-2014-3583 MEDIUM
5.0 Dec 15

The handle_headers function in mod_proxy_fcgi.c in the mod_proxy_fcgi module in the Apache HTTP Server 2.4.10 allows rem
CVE-2014-4424 HIGH
7.5 Sep 19

SQL injection vulnerability in Wiki Server in CoreCollaboration in Apple OS X Server before 2.2.3 and 3.x before 3.2.1 a
CVE-2016-4754 HIGH
7.5 Sep 25

ServerDocs Server in Apple OS X Server before 5.2 supports the RC4 cipher, which might allow remote attackers to defeat

CVE-2013-5143 MEDIUM
6.8 Oct 24

The RADIUS service in Server App in Apple OS X Server before 3.0 selects a fallback X.509 certificate in unspecified cir
CVE-2014-4406 MEDIUM
6.1 Sep 19

Cross-site scripting (XSS) vulnerability in Xcode Server in CoreCollaboration in Apple OS X Server before 3.2.1 allows r
CVE-2015-1151 MEDIUM
5.0 Apr 28

Wiki Server in Apple OS X Server before 4.1 allows remote attackers to bypass intended restrictions on Activity and Peop
CVE-2015-1150 MEDIUM
5.0 Apr 28

The Firewall component in Apple OS X Server before 4.1 uses an incorrect pathname in configuration files, which allows r
CVE-2013-1034 MEDIUM
4.3 Sep 19

Multiple cross-site scripting (XSS) vulnerabilities in Wiki Server in Apple Mac OS X Server before 2.2.2 allow remote at
CVE-2014-4446 LOW
2.1 Oct 18

Mail Service in Apple OS X Server before 4.0 does not enforce SACL changes until after a service restart, which allows r
CVE-2014-4447 LOW
1.9 Oct 18

Profile Manager in Apple OS X Server before 4.0 allows local users to discover cleartext passwords by reading a file aft

Same weakness CWE-284 – Improper Access Control

View all
CVE-2015-3306 CRITICAL POC
10.0
CVE-2012-4681 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2012-1723 CRITICAL POC
9.8
CVE-2012-5076 CRITICAL POC
9.8
CVE-2014-3120 HIGH POC
8.1
CVE-2013-2423 LOW POC
3.7
CVE-2016-3427 CRITICAL
9.8

Same technique Authentication Bypass

View all
CVE-2023-22515 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

References

Advisories & patches
ADVISORY http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html ADVISORY http://lists.apple.com/archives/security-announce/2016/Sep/msg00009.html ADVISORY https://support.apple.com/HT207170 ADVISORY https://support.apple.com/HT207171 REF http://www.securityfocus.com/bid/93060 REF http://www.securitytracker.com/id/1036853

Search Externally

GitHub PoC Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy