Airmail 3 for Mac

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Scheme Handler Incorrect Access Control

CVE ID

CVE-2018-15667

VENDOR

Bloop S.R.L.

PRODUCT

Airmail 3 for Mac

Product version

3.5.9

Vulnerability Details

Airmail for Mac registers and uses the airmail:// URL scheme. The "send" command in the URL scheme allows an external application to send arbitrary emails from an active account without authentication. The handler has no restriction on who can use its functionality. The handler can be invoked using any method that invokes the URL handler such as a hyperlink in an email. The user is not prompted when the handler processes the "send" command which automatically sends an attacker crafted email from the target account.

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Vendor response

No response.

Disclosure timeline

08-06-2018 - Vendor disclosure via email
08-13-2018 - Vendor notified via Support Page
08-21-2018 - Vendor notified of the advisory release

How Hackers Control & Steal Vehicles Remotely

Blog Post

Exploit Development

The trend of automotive security research began in the 2010s and has resulted in the discovery of several critical security issues within modern vehicles. Hackers have repeatedly demonstrated their ability to remotely track, steal, and control a variety of unaltered vehicles.

Airmail 3 for Mac

Advisory

Web Application Security

Airmail’s primary WebView instance implements “webView:decidePolicyForNavigationAction:request:frame:decisionListener:” such that “OpenURL” is the default URL handler. A navigation request is processed by the default URL handler only if the “currentEvent” is “NX_LMOUSEUP” or “NX_OMOUSEUP”.

Airmail 3 for Mac

Advisory

Airmail 3 for Mac

An issue was discovered in Bloop Airmail 3 3.5.9 for macOS. Its primary WebView instance implements “webView:decidePolicyForNavigationAction:request:frame:decisionListener:” such that requests from HTMLIFrameElements are blacklisted. However, other sub-classes of HTMLFrameOwnerElements are not forbidden by the policy. An attacker may abuse HTML plug-in elements within an email to trigger frame navigation requests that bypass this filter.

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