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TITLE:
HTML Purifier Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA43907

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43907/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43907

RELEASE DATE:
2011-03-28

DISCUSS ADVISORY:
http://secunia.com/advisories/43907/#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/43907/

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=43907

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:
Some vulnerabilities have been reported in HTML Purifier, which can
be exploited by malicious people to conduct script insertion attacks
and potentially cause a DoS (Denial of Service).

1) Certain input passed e.g. via CDATA and cssText/innerHTML is not
properly sanitised before being displayed to the user. This can be
exploited to insert arbitrary HTML and script code, which will be
executed in a user's browser session in context of an affected site
when the malicious data is viewed.

2) An error exists within the "tokenizeDOM()" function in
HTMLPurifier/Lexer/DOMLex.php while handling nested DOM objects. This
can be exploited to exhaust the stack space and e.g. cause a crash.

The vulnerabilities are reported in versions prior to 4.3.0.

SOLUTION:
Update to version 4.3.0.

PROVIDED AND/OR DISCOVERED BY:
1) The vendor credits Neike Taika-Tessaro and Mario Heiderich.
2) Reported by the vendor.

ORIGINAL ADVISORY:
http://htmlpurifier.org/news/2011/0327-4.3.0-released

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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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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