Fastly Secret Disclosure Vulnerability

Correspondence from Fastly declined to comment regarding new discovered
vulnerabilities within their website.

Poor practices regarding password changes.


1. Reset user password
2. Access link sent
3. Temporary password sent plaintext


// HTTP POST request

POST /user/mwebsec%40gmail.com/password/request_reset HTTP/2
Host: api.fastly.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:108.0)
Gecko/20100101 Firefox/108.0
[...]

[...]
{"g-recaptcha-response":"03AFY_a8UY[...]"}
[...]


// HTTP response

HTTP/2 200 OK
Cache-Control: no-store
[...]


// HTTP GET request

GET
/auth/user/3lWtx49FrV2.../password/reset/f496875e6e1d88d80aa5.../1677948661/2f2ea8d230adaf03bd749081d...
HTTP/2
Host: manage.fastly.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:108.0)
Gecko/20100101 Firefox/108.0
[...]


// HTTP response

HTTP/2 200 OK
Cache-Control: public, max-age=60, stale-if-error=1209600,
stale-while-revalidate=600
[...]



Weak Pwd requirements

1. Login to user account
2. Click Account -> Personal Profile
3. Select Change Password -> Current Password -> FastLy%2540!1M
4. Select New Password -> P.P.P.P.P.P.P -> Confirm Password -> P.P.P.P.P.P.P
5. Select Sign Out Option
6. Login with new password


// HTTP POST request

POST /oauth/password HTTP/2
Host: api.fastly.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:108.0)
Gecko/20100101 Firefox/108.0
[...]

[...]
client_id=fastly-ui&grant_type=password&new_password=P.P.P.P.P.P.P&old_password=FastLy%2540!1M&username=mwebsec%
40gmail.com
[...]


// HTTP response

HTTP/2 401 Unauthorized
Status: 401 Unauthorized
Cache-Control: no-store
Content-Type: application/json
[...]

[...]
{"msg":"Token 3kzBPKXbsbtZBl9..."}
[...]


// HTTP POST request

POST /oauth/access_token HTTP/2
Host: api.fastly.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:108.0)
Gecko/20100101 Firefox/108.0
[...]

[...]
client_id=fastly-ui&grant_type=password&password=P.P.P.P.P.P.P&username=mwebsec%
40gmail.com
[...]


// HTTP response

HTTP/2 200 OK
Status: 200 OK
[...]

[...]
{"id":"7IU53vPHZ...",
"name":"manage.fastly.com browser session",
"user_id":"3lWtx49FrV...",
"customer_id":"535znFHg...",
[...]
"token_type":"bearer",
"scope":"global",
"services":[],
"access_token":"qwdBQF43O..."}
[...]