Authentication Bypass in Capgo Account Deletion

Executive Summary

This vulnerability exists in Capgo versions before 12.128.2 and involves an authentication bypass in the account deletion endpoint.

It allows attackers to delete user accounts without requiring password re-authentication or secondary verification.

Attackers can exploit this vulnerability through session hijacking, Cross-Site Request Forgery (CSRF) attacks, or parameter tampering.

As a result, unauthorized account deletion can occur, leading to data loss and denial-of-service conditions.

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Detection Guidance

Detection of this vulnerability involves monitoring for unauthorized or suspicious account deletion requests targeting the Capgo account deletion endpoint.

Since the vulnerability allows deletion without password re-authentication or secondary verification, unusual deletion activity without corresponding authentication events may indicate exploitation.

Commands or methods to detect this could include:

• Reviewing web server or application logs for account deletion requests that lack password confirmation or secondary verification parameters.
• Using network monitoring tools (e.g., tcpdump, Wireshark) to capture and analyze HTTP requests to the account deletion endpoint for suspicious patterns such as CSRF or parameter tampering.
• Checking for session hijacking attempts by monitoring for multiple IP addresses or user agents using the same session token.
• Example command to monitor HTTP requests to the deletion endpoint (assuming default logging):
• grep 'DELETE /account/delete' /var/log/nginx/access.log
• or
• tcpdump -i eth0 -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/account/delete'

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Impact Analysis

This vulnerability can have serious impacts including unauthorized deletion of user accounts.

Such unauthorized deletions can cause loss of important user data.

Additionally, it can lead to denial-of-service by disrupting normal account operations.

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Compliance Impact

This vulnerability allows unauthorized deletion of user accounts without proper authentication or secondary verification, which can lead to data loss and denial-of-service.

Such unauthorized account deletions and potential data loss could negatively impact compliance with data protection regulations like GDPR and HIPAA, which require safeguarding user data and ensuring proper access controls.

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Mitigation Strategies

Immediate mitigation steps include:

• Upgrade Capgo to version 12.128.2 or later where the vulnerability is patched.
• Implement password re-entry or secondary verification (such as MFA or OTP) before allowing account deletion.
• Add CSRF protections to the account deletion endpoint to prevent unauthorized requests.
• Consider implementing soft-delete with a grace period instead of immediate hard deletion to allow recovery from accidental or malicious deletions.
• Enhance logging and audit trails to detect and respond to suspicious deletion activities.
• Monitor sessions for hijacking attempts and enforce session freshness checks.

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