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TITLE:
PHP "mb_strcut()" Information Disclosure Security Issue

SECUNIA ADVISORY ID:
SA42135

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/42135/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=42135

RELEASE DATE:
2010-11-09

DISCUSS ADVISORY:
http://secunia.com/advisories/42135/#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/42135/

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=42135

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 security issue has been discovered in PHP, which can be exploited
by malicious users and malicious people to potentially disclose
sensitive information.

The security issue is caused due to an input validation error in
"mbfl_strcut()" in ext/mbstring/libmbfl/mbfl/mbfilter.c, which can be
exploited to disclose potentially sensitive memory by passing an
overly large "length" parameter to the "mb_strcut()" PHP function.

Successful exploitation from remote depends on the application using
the library function.

The security issue is confirmed in version 5.3.3. Other versions may
also be affected.

SOLUTION:
Ensure that parameters passed to "mb_strcut()" are properly validated
and grant only trusted users permissions to invoke "mb_strcut()".

PROVIDED AND/OR DISCOVERED BY:
Mateusz Kocielski

ORIGINAL ADVISORY:
http://marc.info/?l=oss-security&m=128916137005024&w=2

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:
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private users keeping their systems up to date against the latest
vulnerabilities.

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