AWS XMS 2.5 (importer.php, what param)目录遍历
产品: AWS XMS
官网: http://www.aws-dms.com
缺陷版本: 2.5 and probably prior
已测试版本: 2.5
Vendor Patch: March 16, 2013
Public Disclosure: March 27, 2013
Vulnerability Type: Path Traversal [CWE-22]
处理状态: 开发者已修复
Advisory Details:
High-Tech Bridge Security Research Lab discovered path traversal vulnerability in AWS XMS, which can be exploited to read contents of arbitrary files.
1) Path Traversal in AWS XMS: CVE-2013-2474
The vulnerability exists due to insufficient filtration of "what" HTTP GET parameter passed to "/importer.php" script before using it in PHP "file()" function. A remote attacker can read contents of arbitrary files on the target system.
The vulnerable script sets "text/javascript" Content-Type for the output data, which makes exploitation of the vulnerability via a web browser inconvenient. Exploitation via telnet or wget utilities is easier.
The following PoC (Proof of Concept) code uses wget utility to download source code of "/default.php" file, which contains application configuration data and administrator’s credentials:
wget http://www.2cto.com /importer.php?what=defaults.php%00.js
To bypass protections against NULL-byte injection (implemented in PHP 5.3.4 and later versions) or enabled "magic_quotes_gpc", alternative techniques based on path normalization and length restrictions can be used.
The second PoC code uses a large amount of '/' symbols (4096 is sufficient for the majority of platforms) to bypass the restrictions and get source code of the "/default.php" file:
wget http://[host]/importer.php?what=defaults.php///////...//////.js
解决方案
升级到 AWS XMS 2.6
More Information:
http://www.aws-dms.com/temp.php?use=templates/download.xml#xms-2.6
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