Polar Flow Android 5.7.1 Secret Disclosure

`# Trovent Security Advisory 2110-01 #  
#####################################  
  
  
Insecure data storage in Polar Flow Android application  
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Overview  
########  
  
Advisory ID: TRSA-2110-01  
Advisory version: 1.0  
Advisory status: Public  
Advisory URL: https://trovent.io/security-advisory-2110-01  
Affected product: Polar Flow Android mobile application (fi.polar.polarflow)  
Affected version: 5.7.1  
Vendor: Polar Electro, https://flow.polar.com  
Credits: Trovent Security GmbH, Karima Hebbal  
  
  
Detailed description  
####################  
  
The Polar Flow app is a sports, fitness and activity analyzer which allows to plan  
and monitor training, daily activity and sleep.  
Trovent Security GmbH discovered that the application stores the username and  
password in clear text in a file on the mobile device.  
  
Severity: Medium  
CVSS Score: 4.4 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N)  
CVE ID: N/A  
CWE ID: CWE-312  
  
  
Proof of concept  
################  
  
Content of the file /data/data/fi.polar.polarflow/shared_prefs/UserData3.xml:  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
<?xml version='1.0' encoding='utf-8' standalone='yes' ?>  
<map>  
<string name="current_device_id">no_device</string>  
<int name="last_version_code" value="5070103" />  
<string name="base_url">https://www.polarremote.com/v2/users/54871065</string>  
<string name="last_name">Ptest</string>  
<int name="key_initial_view_resource_id" value="2131363187" />  
<boolean name="valid_ver_two" value="true" />  
<long name="problem_phone_message_time" value="1634888249727" />  
<boolean name="new_blogs_available" value="true" />  
<string name="address_json">{"city":"\u003cscript\u003ealert(1)\u003c/script\  
u003e","countryCode":"DE","modified":"2021-10-22T07:37:5  
3.000Z"}</string>  
<string name="profile_json">{"favoriteSports":[]}</string>  
<string name="password">Test2021</string>  
<string name="last_blog_sync_time">2021-10-22T09:37:18.309</string>  
<long name="user_id" value="54871065" />  
<boolean name="initial_remote_sync_executed" value="true" />  
<string name="preferred_blog_language">en</string>  
<int name="key_training_diary_tab" value="0" />  
<string name="first_name">Ptest</string>  
<int name="should_show_problem_phone_message" value="2" />  
<string name="username">[email protected]</string>  
</map>  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
  
Solution / Workaround  
#####################  
  
We recommend not to store sensitive information in clear text on the mobile  
device.  
  
Fixed in version 6.3.0, verified by Trovent.  
  
  
History  
#######  
  
2021-10-18: Vulnerability found  
2021-12-15: Vendor contacted  
2022-01-20: Contacted vendor again  
2022-01-21: Vendor replied that the vulnerability will be checked  
2022-01-28: Vendor replied, the vulnerability will be fixed in a future update  
2022-07-27: Vendor contacted, asking for status  
2022-08-09: Vendor replied, the vulnerability is fixed since version 6.3.0  
2022-08-17: Trovent verified remediation of the vulnerability  
2022-08-18: Advisory published  
`