STG Security Advisory: [SSA-20050120-22] JSBoard file disclosure vulnerability.
Revision 1.0 Date Published: 2005-01-20 (KST) Last Update: 2005-01-20 (KST) Disclosed by SSR Team (firstname.lastname@example.org)
JSBoard is one of widely used web BBS applications in Korea. Because of an input validation flaw, a malicious attacker can read arbitrary files.
Implementation Error: Input validation flaw
Medium : arbitrary file disclosure
JSBoard 2.0.9 and prior.
2004-12-31 Vulnerability found. 2004-12-31 JSBoard developer notified. 2005-01-02 Developer confirmed. 2005-01-02 Update version released. 2005-01-20 Official release.
PHP has a feature discarding the input values containing null characters when magic_quotes_gpc = off. Because JSBoard session.php doesn't sanitize $table variable, a malicious attacker can read arbitrary files.
include_once "include/print.php"; parse_query_str(); $opt = $table ? "&table=$table" : ""; $opts = $table ? "?table=$table" : ""; ...snip...
A local web proxy (e.g., Achilles) is required to prove the vulnerability.
Upgrade to 2.0.10 http://kldp.net/frs/download.php/1729/jsboard-2.0.10.tar.gz
Jeremy Bae at STG Security