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CVE-2010-5099 affects the fileDenyPattern functionality in the PHP file inclusion protection API in TYPO3 4.2.x before 4.2.16, 4.3.x before 4.3.9, and 4.4.x before 4.4.5. The filtering intended to block access to disallowed file types is insufficient, allowing an attacker to bypass file access restrictions and reach arbitrary PHP files. The issue can be exploited via path traversal sequences combined with %00 null-byte injection to defeat extension-based filtering; the published description specifically notes use in conjunction with CVE-2010-3714 to read sensitive local files such as localconf.php and recover the TYPO3 encryption key.
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