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GHSA-3c93-f73f-qc9h
social-auth-coreImpact
The vk-app backend accepted VK application callback data without verifying the callback signature when the auth_key parameter was omitted.
Applications using this backend could treat unsigned attacker-controlled data as a verified VK identity. An attacker could choose callback fields such as viewer_id, access_token, api_id, and api_result, potentially allowing authentication as an arbitrary VK user ID.
The issue affects only applications using the vk-app backend.
Patches
The issue has been fixed by requiring auth_key to be present and valid before callback data is trusted.
Users should upgrade to a patched version.
Fix:
- https://github.com/python-social-auth/social-core/pull/1811
Workarounds
Applications that cannot upgrade immediately should disable the vk-app backend by removing social_core.backends.vk.VKAppOAuth2 from SOCIAL_AUTH_AUTHENTICATION_BACKENDS.
There is no complete workaround while continuing to use the vulnerable backend.
Credits
Reported by @lalalala5678 through GitHub private vulnerability reporting.
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The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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