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TITLE:
WordPress s2Member Plugin "s2_invoice" Custom Capabilities Security
Bypass Vulnerability

SECUNIA ADVISORY ID:
SA47101

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47101/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47101

RELEASE DATE:
2011-12-07

DISCUSS ADVISORY:
http://secunia.com/advisories/47101/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/47101/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=47101

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been reported in the s2Member plugin for
WordPress, which can be exploited by malicious users to bypass
certain security restrictions.

Input passed to the "s2_invoice" parameter within payment URLs is not
properly verified before being used to grant access to products when
using custom capabilities. This can be exploited to access arbitrary
products by supplying certain capabilities.

The following payment gateways are reportedly affected:
* ccBill® Buttons
* ClickBank® Buttons
* Google® Checkout Buttons
* PayPal® Buttons with disabled "Button Encryption"

The vulnerability is reported in versions prior to 111206.

SOLUTION:
Update to version 111206. Enable "Button Encryption" within the
"Account Details" of the "PayPal Options" in case "PayPal® Buttons"
are used.

PROVIDED AND/OR DISCOVERED BY:
Pedja within a s2Member plugin forum post.

ORIGINAL ADVISORY:
s2Member:
http://wordpress.org/extend/plugins/s2member/changelog/

Pedja:
http://www.primothemes.com/forums/viewtopic.php?f=4&t=15232

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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