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STG Security Advisory: [SSA-20041215-18] Vulnerability of uploading files with multiple extensions in phpBB Attachment Mod
From: "SSR Team" <advisory () stgsecurity com>
Date: Thu, 16 Dec 2004 10:25:21 +0900
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STG Security Advisory: [SSA-20041215-18] Vulnerability of uploading files
with multiple extensions in phpBB Attachment Mod
Date Published: 2004-12-15 (KST)
Last Update: 2004-12-15
Disclosed by SSR Team (advisory () stgsecurity com)
phpBB Attachment Mod is file upload module for phpBB. However, an input
validation flaw can cause malicious attackers to run arbitrary commands with
the privilege of the HTTPD process, which is typically run as the nobody
Implementation Error: Input validation flaw
High : arbitrary command execution.
Attachment Mod 2.3.10 and prior.
Vendor Status: FIXED
2004-12-08 Vulnerability found.
2004-12-08 Attachment Mod developer notified.
2004-12-13 Update version released.
2004-12-15 Official release.
Apache Mod doesn't implemented to check multiple extensions of uploaded
files, e.g. attack.php.rar, so malicious attackers can upload arbitrary
script files (php, pl, cgi, etc) to a web server. This is originated from a
feature of Apache MIME module (mod_mime), which regards attack.php.rar as a
normal PHP file and execute the file through mod_php module with the
privilege of the HTTPD process.
cf. http://httpd.apache.org/docs/mod/mod_mime.html - "Files with Multiple
Extensions" : it's a feature, not a bug.
Update to 2.3.11
Jeremy Bae at STG Security
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Full-Disclosure - We believe in it.
- STG Security Advisory: [SSA-20041215-18] Vulnerability of uploading files with multiple extensions in phpBB Attachment Mod SSR Team (Dec 18)