Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the LoginRadius backend did not validate OAuth state during the authentication flow. Applications using this backend were vulnerable to login CSRF. An attacker could cause a victim's browser session to complete authentication using an attacker-controlled LoginRadius token, making the victim authenticated as the attacker's LoginRadius identity. The issue affects only applications using the LoginRadius backend. The issue has been fixe in version 5.0.0 by enabling callback state validation for the LoginRadius backend.

Affected: PyPI: social-auth-core

### Impact

The LoginRadius backend did not validate OAuth state during the authentication flow.

Applications using this backend were vulnerable to login CSRF. An attacker could cause a victim's browser session to complete authentication using an attacker-controlled LoginRadius token, making the victim authenticated as the attacker's LoginRadius identity.

The issue affects only applications using the LoginRadius backend.

### Patches

The issue has been fixed by enabling callback state validation for the LoginRadius backend.

Users should upgrade to a patched version.

Fix:

* https://github.com/python-social-auth/social-core/pull/1808

### Workarounds

Applications that cannot upgrade immediately should disable the LoginRadius backend by removing it from `SOCIAL_AUTH_AUTHENTICATION_BACKENDS`.

There is no complete workaround while continuing to use the vulnerable backend.

### Credits

Reported through GitHub private vulnerability reporting by Liyi Zhou, Ziyue Wang, Strick, Maurice, and Chenchen Yu from the University of Sydney security research team.

Reporter references:

* https://lzhou1110.github.io/ * https://zyy0530.github.io/ * https://str1ckl4nd.github.io/ * https://maurice.busystar.org/ * https://7thparkk.github.io/

Affected: PyPI: social-auth-core

### Impact

The LoginRadius backend did not validate OAuth state during the authentication flow.

Applications using this backend were vulnerable to login CSRF. An attacker could cause a victim's browser session to complete authentication using an attacker-controlled LoginRadius token, making the victim authenticated as the attacker's LoginRadius identity.

The issue affects only applications using the LoginRadius backend.

### Patches

The issue has been fixed by enabling callback state validation for the LoginRadius backend.

Users should upgrade to a patched version.

Fix:

* https://github.com/python-social-auth/social-core/pull/1808

### Workarounds

Applications that cannot upgrade immediately should disable the LoginRadius backend by removing it from `SOCIAL_AUTH_AUTHENTICATION_BACKENDS`.

There is no complete workaround while continuing to use the vulnerable backend.

### Credits

Reported through GitHub private vulnerability reporting by Liyi Zhou, Ziyue Wang, Strick, Maurice, and Chenchen Yu from the University of Sydney security research team.

Reporter references:

* https://lzhou1110.github.io/ * https://zyy0530.github.io/ * https://str1ckl4nd.github.io/ * https://maurice.busystar.org/ * https://7thparkk.github.io/

Affected: Ubuntu:Pro:14.04:LTS: python2.7, Ubuntu:Pro:14.04:LTS: python3.4, Ubuntu:Pro:14.04:LTS: python3.5, Ubuntu:Pro:16.04:LTS: python2.7, Ubuntu:Pro:16.04:LTS: python3.5, Ubuntu:Pro:18.04:LTS: python2.7, Ubuntu:Pro:18.04:LTS: python3.6, Ubuntu:Pro:18.04:LTS: python3.7, Ubuntu:Pro:18.04:LTS: python3.8, Ubuntu:Pro:20.04:LTS: python3.8 and 7 more

Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the LoginRadius backend did not validate OAuth state during the authentication flow. Applications using this backend were vulnerable to login CSRF. An attacker could cause a victim's browser session to complete authentication using an attacker-controlled LoginRadius token, making the victim authenticated as the attacker's LoginRadius identity. The issue affects only applications using the LoginRadius backend. The issue has been fixe in version 5.0.0 by enabling callback state validation for the LoginRadius backend.