Incorrect username validation in the registration process of CTFd v2.0.0 - v2.2.2 allows an attacker to take over an arbitrary account if the username is known and emails are enabled on the CTFd instance. To exploit the vulnerability, one must register with a username identical to the victim's username, but with white space inserted before and/or after the username. This will register the account with the same username as the victim. After initiating a password reset for the new account, CTFd will reset the victim's account password due to the username collision.
{
"extracted_events": [
{
"cpe": "cpe:2.3:a:ctfd:ctfd:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.0.0"
},
{
"last_affected": "2.2.2"
}
],
"source": "CPE_RANGE"
},
{
"original_tag": "2.2.3",
"range": [
{
"fixed": "d59bfa3578b0e5ac8dd3570038d123014372a81c"
}
],
"source": "REFERENCES_TAG"
}
]
}