Trustwave Unveils New Offerings to Maximize Value of Microsoft Security Investments. Learn More

Trustwave Unveils New Offerings to Maximize Value of Microsoft Security Investments. Learn More

Managed Detection & Response

Eliminate active threats with 24/7 threat detection, investigation, and response.

Co-Managed SOC (SIEM)

Maximize your SIEM investment, stop alert fatigue, and enhance your team with hybrid security operations support.

Advisory & Diagnostics

Advance your cybersecurity program and get expert guidance where you need it most.

Penetration Testing

Test your physical locations and IT infrastructure to shore up weaknesses before exploitation.

Database Security

Prevent unauthorized access and exceed compliance requirements.

Email Security

Stop email threats others miss and secure your organization against the #1 ransomware attack vector.

Digital Forensics & Incident Response

Prepare for the inevitable with 24/7 global breach response in-region and available on-site.

Firewall & Technology Management

Mitigate risk of a cyberattack with 24/7 incident and health monitoring and the latest threat intelligence.

Offensive Security
Solutions to maximize your security ROI
Microsoft Exchange Server Attacks
Stay protected against emerging threats
Rapidly Secure New Environments
Security for rapid response situations
Securing the Cloud
Safely navigate and stay protected
Securing the IoT Landscape
Test, monitor and secure network objects
Why Trustwave
About Us
Awards and Accolades
Trustwave SpiderLabs Team
Trustwave Fusion Security Operations Platform
Trustwave Security Colony
Technology Alliance Partners
Key alliances who align and support our ecosystem of security offerings
Trustwave PartnerOne Program
Join forces with Trustwave to protect against the most advance cybersecurity threats
SpiderLabs Blog

GO SMS Pro Vulnerable to Media File Theft

The GO SMS Pro application is a popular messenger app with over 100 million downloads and was discovered to publicly expose media transferred between users of the app. This exposure includes private voice messages, video messages, and photos. This means any sensitive media shared between users of this messenger app is at risk of being compromised by an unauthenticated attacker or curious user.

Go sms pro - google play


This weakness was discovered on GO SMS Pro v7.91. It is unclear which other versions are affected but we believe this is likely to affect previous and potentially future versions as well. The GO SMS Pro application, like other messenger apps, allows users to send private media to other users as demonstrated below. If the recipient has the GO SMS Pro app on their device, the media would be displayed automatically within the app.


However, if the recipient does not have the GO SMS Pro app installed, the media file is sent to the recipient as a URL via SMS. The user could then click on the link and view the media file via a browser.

Background 3

Vulnerability Discovery

SpiderLabs found that accessing the link was possible without any authentication or authorization, meaning that any user with the link is able to view the content. In addition, the URL link was sequential (hexadecimal) and predictable. Furthermore, when sharing media files, a link will be generated regardless of the recipient having the app installed.  As a result, a malicious user could potentially access any media files sent via this service and also any that are sent in the future. This obviously impacts the confidentiality of media content sent via this application.

The following demonstrates how an attacker could abuse this weakness to view other users’ media content without authorization:

When a recipient receives an SMS text containing a media URL link sent from this app, the text message appears as follows:

"I sent you an audio clip:<gof=Ah7v>"

Browsing to would allow the recipient to view the voice message. However, by incrementing the value in the URL, it is possible to view or listen to other media messages shared between other users. For example, accessing would show a photo of a fake driver’s license [sample license showed].

To demonstrate how an attacker could easily steal masses of user data, a simple bash script could be used to generate a sample list of URLs.

(echo obase=16; seq 1 $((echo ibase=16; echo FF) | bc)) | bc > 1
for i in $(cat 1); do echo "$i /w"; done | tr -d " "

By taking the generated URLs and pasting them into the multi-tab extension on Chrome or Firefox, it is trivial to access private (and potentially sensitive) media files sent by users of this application.



Trustwave attempted to contact the vendor multiple times since 18 August 2020 but did not receive any response. As such, this vulnerability is still present and presents a risk to users. It is highly recommended to avoid sending media files that you expect to remain private or that may contain sensitive data using this popular messenger app, at least until the vendor acknowledges this vulnerability and remediates it.

Revision History

  • 08/18/2020 - Vendor contacted with no response
  • 09/15/2020 - Vendor contacted with no response
  • 10/14/2020 - Vendor contacted with no response
  • 11/16/2020 - Vendor contacted with no response
  • 11/19/2020 - Advisory published


TWSL2020-008: Lack of Access Control in GO SMS Pro

Latest SpiderLabs Blogs

Network Isolation for DynamoDB with VPC Endpoint

DynamoDB is a fully managed NoSQL database service offered by Amazon Web Services (AWS). It is renowned for its scalability, dependability, and easy connection with other AWS services....

Read More

The Underdog of Cybersecurity: Uncovering Hidden Value in Threat Intelligence

Threat Intelligence, or just TI, is sometimes criticized for possibly being inaccurate or outdated. However, there are compelling reasons to incorporate it into your cybersecurity defense strategy....

Read More

Clockwork Blue: Automating Security Defenses with SOAR and AI

It’s impractical to operate security operations alone, using manual human processes. Finding opportunities to automate SecOps is an underlying foundation of Zero Trust and an essential architecture...

Read More