Vulnerabilities > CVE-2016-4694 - Improper Access Control vulnerability in Apple mac OS X
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
NONE Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Embedding Scripts within Scripts An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
- Signature Spoofing by Key Theft An attacker obtains an authoritative or reputable signer's private signature key by theft and then uses this key to forge signatures from the original signer to mislead a victim into performing actions that benefit the attacker.
Nessus
NASL family MacOS X Local Security Checks NASL id MACOS_SERVER_5_2.NASL description The version of macOS Server (formerly known as Mac OS X Server) installed on the remote host is prior to 5.2. It is, therefore, affected by the following vulnerabilities : - The Apache HTTP Server is affected by a man-in-the-middle vulnerability known as last seen 2020-06-01 modified 2020-06-02 plugin id 93813 published 2016-09-30 reporter This script is Copyright (C) 2016-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/93813 title macOS : macOS Server < 5.2 Multiple Vulnerabilities (httpoxy) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(93813); script_version("1.7"); script_cvs_date("Date: 2018/07/14 1:59:37"); script_cve_id("CVE-2016-4694", "CVE-2016-4754"); script_bugtraq_id(93060, 93061); script_xref(name:"APPLE-SA", value:"APPLE-SA-2016-09-20-4"); script_name(english:"macOS : macOS Server < 5.2 Multiple Vulnerabilities (httpoxy)"); script_summary(english:"Checks the macOS Server version."); script_set_attribute(attribute:"synopsis", value: "The remote host is missing a security update for macOS Server."); script_set_attribute(attribute:"description", value: "The version of macOS Server (formerly known as Mac OS X Server) installed on the remote host is prior to 5.2. It is, therefore, affected by the following vulnerabilities : - The Apache HTTP Server is affected by a man-in-the-middle vulnerability known as 'httpoxy' due to a failure to properly resolve namespace conflicts in accordance with RFC 3875 section 4.1.18. The HTTP_PROXY environment variable is set based on untrusted user data in the 'Proxy' header of HTTP requests. The HTTP_PROXY environment variable is used by some web client libraries to specify a remote proxy server. An unauthenticated, remote attacker can exploit this, via a crafted 'Proxy' header in an HTTP request, to redirect an application's internal HTTP traffic to an arbitrary proxy server where it may be observed or manipulated. (CVE-2016-4694) - Multiple unspecified flaws exist that are related to the RC4 algorithm that allow an unauthenticated, remote attacker to defeat cryptographic protection mechanisms. (CVE-2016-4754)"); script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT207171"); # https://lists.apple.com/archives/security-announce/2016/Sep/msg00009.html script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a9b0d4cb"); script_set_attribute(attribute:"see_also", value:"https://httpoxy.org"); script_set_attribute(attribute:"solution", value: "Upgrade to macOS Server version 5.2 or later. Note that macOS Server version 5.2 is available only for macOS 10.12 or later."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"vuln_publication_date", value:"2016/03/21"); script_set_attribute(attribute:"patch_publication_date", value:"2016/09/20"); script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/30"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:os_x_server"); script_set_attribute(attribute:"in_the_news", value:"true"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"MacOS X Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc."); script_dependencies("macosx_server_services.nasl"); script_require_keys("Host/local_checks_enabled", "Host/MacOSX/Version", "MacOSX/Server/Version"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("misc_func.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); os = get_kb_item("Host/MacOSX/Version"); if (!os) audit(AUDIT_OS_NOT, "macOS"); version = get_kb_item_or_exit("MacOSX/Server/Version"); fixed_version = "5.2"; if (ver_compare(ver:version, fix:fixed_version, strict:FALSE) == -1) { security_report_v4( port:0, severity:SECURITY_HOLE, extra: '\n Installed version : ' + version + '\n Fixed version : ' + fixed_version + '\n' ); } else audit(AUDIT_INST_VER_NOT_VULN, "macOS Server", version);
NASL family MacOS X Local Security Checks NASL id MACOS_10_12.NASL description The remote host is running a version of Mac OS X that is prior to 10.10.5, 10.11.x prior to 10.11.6, or is not macOS 10.12. It is, therefore, affected by multiple vulnerabilities in the following components : - apache - apache_mod_php - Apple HSSPI Support - AppleEFIRuntime - AppleMobileFileIntegrity - AppleUCC - Application Firewall - ATS - Audio - Bluetooth - cd9660 - CFNetwork - CommonCrypto - CoreCrypto - CoreDisplay - curl - Date & Time Pref Pane - DiskArbitration - File Bookmark - FontParser - IDS - Connectivity - ImageIO - Intel Graphics Driver - IOAcceleratorFamily - IOThunderboltFamily - Kerberos v5 PAM module - Kernel - libarchive - libxml2 - libxpc - libxslt - mDNSResponder - NSSecureTextField - Perl - S2 Camera - Security - Terminal - WindowServer Note that successful exploitation of the most serious issues can result in arbitrary code execution. last seen 2020-06-01 modified 2020-06-02 plugin id 93685 published 2016-09-23 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/93685 title macOS < 10.12 Multiple Vulnerabilities
References
- http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
- http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
- http://lists.apple.com/archives/security-announce/2016/Sep/msg00009.html
- http://lists.apple.com/archives/security-announce/2016/Sep/msg00009.html
- http://www.securityfocus.com/bid/93060
- http://www.securityfocus.com/bid/93060
- http://www.securitytracker.com/id/1036853
- http://www.securitytracker.com/id/1036853
- https://support.apple.com/HT207170
- https://support.apple.com/HT207170
- https://support.apple.com/HT207171
- https://support.apple.com/HT207171