Executive Summary

This vulnerability is a flaw in the liangliangyy DjangoBlog software up to version 2.1.0.0. It exists in the function form_valid within the file oauth/views.py. The issue arises from improper handling or manipulation of the argument oauthid, which leads to improper authorization.

Because of this flaw, an attacker can remotely exploit the vulnerability to bypass authorization controls.

The exploit for this vulnerability has already been published, and the vendor did not respond to early disclosure attempts.

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Impact Analysis

This vulnerability can allow an attacker to gain unauthorized access or perform actions they should not be allowed to within the DjangoBlog application.

Since the flaw involves improper authorization, it could lead to exposure or modification of sensitive data, or unauthorized operations being performed.

The attack can be initiated remotely, increasing the risk of exploitation without physical access.

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Compliance Impact

This vulnerability allows an attacker to hijack other users' OAuth social login identities, effectively enabling account takeover via social authentication.

Such unauthorized access and manipulation of user identity data can lead to violations of data protection regulations like GDPR and HIPAA, which require strict controls over user data access and authorization.

Specifically, improper authorization and account takeover can result in unauthorized disclosure or modification of personal data, undermining compliance with these standards.

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Detection Guidance

This vulnerability can be detected by checking for unauthorized modification attempts to the oauthid parameter in requests to the /oauth/requireemail/<id>.html endpoint.

You can monitor HTTP requests to this endpoint and look for suspicious form submissions where the oauthid parameter does not belong to the authenticated user.

Example commands to detect such activity include using network traffic inspection tools or web server logs to filter requests:

• Using grep on web server logs to find requests to the vulnerable endpoint: grep "/oauth/requireemail/" /var/log/nginx/access.log
• Using a packet capture tool like tcpdump to capture HTTP POST requests to the endpoint: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep "/oauth/requireemail/"
• Using curl or similar tools to test the endpoint manually by submitting forms with different oauthid values to check if unauthorized changes are accepted.

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Mitigation Strategies

Immediate mitigation steps include verifying on the server side that the oauthid submitted in the form belongs to the currently authenticated user before making any modifications.

Additionally, avoid relying on client-submitted oauthid data by storing the OAuth ID securely on the server side within the user session.

If possible, apply patches or updates that implement these checks or restrict access to the vulnerable endpoint until a fix is deployed.

Monitoring and alerting on suspicious activity related to oauthid manipulation can also help mitigate exploitation.

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