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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.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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