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CVE-2016-0956 : Detail

CVE-2016-0956

7.5
/
HIGH
A01-Broken Access Control
2.73%V3
Network
2016-02-10 19:00 +00:00
2018-10-09 16:57 +00:00
CVE.org
NVD

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Descriptions

The Servlets Post component 2.3.6 in Apache Sling, as used in Adobe Experience Manager 5.6.1, 6.0.0, and 6.1.0, allows remote attackers to obtain sensitive information via unspecified vectors.

Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Metrics

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

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

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

None

There is no loss of integrity within 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 7.8 AV:N/AC:L/Au:N/C:C/I:N/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 : 39435

Publication date : 2016-02-09 23:00 +00:00
Author : Vulnerability-Lab
EDB Verified : Yes

Document Title: =============== Apache Sling Framework v2.3.6 (Adobe AEM) [CVE-2016-0956] - Information Disclosure Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1536 Adobe Bulletin: https://helpx.adobe.com/security/products/experience-manager/apsb16-05.html http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-0956 Vulnerability Magazine: http://magazine.vulnerability-db.com/?q=articles/2016/02/10/apache-sling-fw-v236-remote-slingpostservlet-exception-vulnerability CVE-ID: ======= CVE-2016-0956 Release Date: ============= 2016-02-10 Vulnerability Laboratory ID (VL-ID): ==================================== 1536 Common Vulnerability Scoring System: ==================================== 6.4 Product & Service Introduction: =============================== Apache Sling is a web framework that uses a Java Content Repository, such as Apache Jackrabbit, to store and manage content. Sling applications use either scripts or Java servlets, selected based on simple name conventions, to process HTTP requests in a RESTful way. The embedded Apache Felix OSGi framework and console provide a dynamic runtime environment, where code and content bundles can be loaded, unloaded and reconfigured at runtime. As the first web framework dedicated to JSR-170 Java Content Repositories, Sling makes it very simple to implement simple applications, while providing an enterprise-level framework for more complex applications. (Copy of the Vendor Homepage: http://sling.apache.org/) Adobe Experience Manager (AEM) provides a complete suite of applications for the Web Experience Management (WEM) of organizations. (Copy of the Vendor Homepage: https://docs.adobe.com/docs/en/aem/6-1.html ) Abstract Advisory Information: ============================== The Vulnerability Laboratory Core Research Team discovered a remote vulnerability in the official Apache Sling Framwork v2.3.6 software. Vulnerability Disclosure Timeline: ================================== 2016-02-10: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Apache Software Foundation Product: Apache Sling - Framework (Adobe AEM) 2.3.6 Exploitation Technique: ======================= Remote Severity Level: =============== High Technical Details & Description: ================================ It seems that on some instances of AEM, due to lack of proper security controls and or misconfiguration, it is possible for remote unauthenticated users to enumerate local system files/folders that arent accessible publicly to unauthenticated users. This can be achieved by sending a `delete` requests to the SlingPostServlet which in return, responds back with a 500 exception page and the following exception message: (org.apache.sling.api.resource.PersistenceException - Unable to commit changes to session) No actual files are deleted with this request however, the HTML response contains a `ChangeLog` field which is where all enumerated folder/file names are displayed (if existing). For instance, following POC command can be used to reproduce the said behavior. curl -F``:operation=delete`` -F``:applyTo=/foldername/*`` http://website.com/path/file.html To reproduce this in real world, I found an adobe website which is currently affected with this behavior. You can use the following CURL command to reproduce the POC: curl -F``:operation=delete`` -F``:applyTo=/etc/*`` https://server/content/adobedemolab/welcome-page.html Note: This curl command should enumerate all files/folders which currently exist in /etc folder This vulnerability currently affects major websites i.e. almost every instance of Adobe AEM published on the internet. Some references are included below for reference. Affected Framework(s): Apache Sling Affected Product(s) Adobe AEM (All Versions) Proof of Concept (PoC): ======================= The security vulnerability can be exploited by remote attackers without privilege system user account or user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. PoC: 1. curl -F":operation=delete" -F":applyTo=/foldername/*" http://website.com/path/file.html 2. curl -F":operation=delete" -F":applyTo=/etc/*" https://www.adobedemo.com/content/adobedemolab/welcome-page.html Solution - Fix & Patch: ======================= The vulnerability is fixed in version Servlets POST 2.3.8. Please update by by automatic request or implement the manual fix. Adobe: Hot fix 6445 resolves an information disclosure vulnerability affecting Apache Sling Servlets Post 2.3.6 (CVE-2016-0956). Security Risk: ============== The security risk of the exception software vulnerability in the apache sling framework is estimated as high. (CVSS 6.4) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Ateeq Khan (ateeq@evolution-sec.com) [www.vulnerability-lab.com] (https://twitter.com/cybercrimenews) 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. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - admin@evolution-sec.com Section: magazine.vulnerability-db.com - vulnerability-lab.com/contact.php - evolution-sec.com/contact Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php Programs: vulnerability-lab.com/submit.php - vulnerability-lab.com/list-of-bug-bounty-programs.php - vulnerability-lab.com/register/ Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use or edit our material contact (admin@vulnerability-lab.com or research@vulnerability-lab.com) to get a permission. Copyright © 2016 | Vulnerability Laboratory - [Evolution Security GmbH]™ -- VULNERABILITY LABORATORY - RESEARCH TEAM SERVICE: www.vulnerability-lab.com CONTACT: research@vulnerability-lab.com

Products Mentioned

Configuraton 0

Apache>>Sling >> Version *

Configuraton 0

Adobe>>Experience_manager >> Version 5.6.1

Adobe>>Experience_manager >> Version 6.0.0

Adobe>>Experience_manager >> Version 6.1.0

Apple>>Mac_os_x >> Version *

Linux>>Linux_kernel >> Version *

Microsoft>>Windows >> Version *

References

http://seclists.org/fulldisclosure/2016/Feb/48
Tags : mailing-list, x_refsource_FULLDISC
https://www.exploit-db.com/exploits/39435/
Tags : exploit, x_refsource_EXPLOIT-DB

More information
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