Description

AVideo: Video Publishing Workflow Bypass via Unauthorized overrideStatus Request Parameter

Summary

AVideo's video processing pipeline accepts an overrideStatus request parameter that allows any uploader to set a video's status to any valid state, including "active" (a). This bypasses the admin-controlled moderation and draft workflows. The setStatus() method validates the status code against a list of known values but does not verify that the caller has permission to set that particular status. As a result, any user with upload permissions can publish videos directly, circumventing content review processes.

Details

At objects/video.php:1055-1056, the video object checks for an overrideStatus parameter in the request and applies it directly:

if (!empty($_REQUEST['overrideStatus'])) {
    return $this->setStatus($_REQUEST['overrideStatus']);
}

This code is reached from two entry points:

objects/videoAddNew.json.php:157 - when adding a new video

objects/aVideoEncoder.json.php:114 - when processing an encoded video

The setStatus() method validates that the provided status code is one of the recognized values (a, k, i, h, e, x, d, t, u, s, r, f, b, p, c) but does not perform any authorization check. It does not verify whether the calling user has permission to set a video to the requested status.

The relevant status codes include:

a - Active (published and publicly visible)

k - Draft (pending review)

i - Inactive

e - Encoding

x - Deleted

u - Unlisted

When an admin configures the platform to require moderation (new videos default to draft/pending status), any uploader can bypass this by including overrideStatus=a in their upload request.

Proof of Concept

Assume the AVideo instance has moderation enabled (new videos default to draft status k).

Upload a video as a regular user, including the overrideStatus parameter:

curl -b "PHPSESSID=USER_SESSION" \
  -X POST "https://your-avideo-instance.com/objects/videoAddNew.json.php" \
  -F "title=Bypassed Moderation" \
  -F "description=This video skips the review queue" \
  -F "videoLink=https://example.com/video.mp4" \
  -F "overrideStatus=a"

The video is immediately set to active status and is publicly visible, bypassing the admin moderation workflow.

Verify the video is publicly accessible:

curl -s "https://your-avideo-instance.com/video/VIDEO_CLEAN_TITLE" | grep -o "<title>.*</title>"

An uploader can also use this to set other statuses:

# Set a video to "unlisted" even if the platform restricts this
curl -b "PHPSESSID=USER_SESSION" \
  -X POST "https://your-avideo-instance.com/objects/videoAddNew.json.php" \
  -F "title=Unlisted Video" \
  -F "videoLink=https://example.com/video.mp4" \
  -F "overrideStatus=u"

Impact

Any user with upload permissions can bypass content moderation by setting videos directly to active status. This undermines the platform's ability to enforce content policies, review uploads before publication, or maintain a moderation queue. On platforms that rely on moderation for legal compliance (e.g., DMCA, age-gated content), this bypass could have regulatory consequences. The same mechanism also allows uploaders to set arbitrary statuses like "unlisted" or "inactive" on their own videos, bypassing platform-level restrictions on these features.

CWE-285: Improper Authorization

Severity: Medium

Recommended Fix

Add an authorization check before applying the overrideStatus parameter at objects/video.php:1055:

// objects/video.php:1055
if (!empty($_REQUEST['overrideStatus']) && (User::isAdmin() || Permissions::canAdminVideos())) {
    return $this->setStatus($_REQUEST['overrideStatus']);
}

This ensures that only administrators or users with video management permissions can override the video publishing status. Regular uploaders will follow the normal moderation workflow.

Found by aisafe.io

Mitigation

Aliases

References