A vulnerability, which was classified as critical, was found in Adobe Flash (Multimedia Player Software) (unknown version). Affected is an unknown code block of the component Sandbox. The manipulation as part of a Whitespace leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was shared 09/27/2016 by Leone Pontorieri as not defined mailinglist post (Full-Disclosure). The advisory is shared for download at seclists.org. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

A public exploit has been developed by Leone Pontorieri and been published immediately after the advisory. The exploit is shared for download at seclists.org. It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k. The code used by the exploit is:

navigateToURL(new URLRequest("file:///C:/attack-this-sandbox.html%20%20%20"));

Flash has never fixed these issues and local-with-filesystem sandbox can be optionally enabled, by editing a configuration file. So, Flash still contains the vulnerable piece of code, but it can be exploited only if an uncommon setting is enabled. In this way, these vulnerabilities are “frozen” in the code and their fate is to be reproduced in every future version of Adobe Flash, but it seems unrealistic to use those again in a real world scenario.

Upgrading eliminates this vulnerability. The mailinglist post contains the following remark:

Like a lot of love stories, the one between Flash and local files is over. Local-with-filesystem sandbox has today, after a decade, been killed by Adobe, making (almost) obsolete those Flash files using that feature.

The entries 92243 and 92245 are related to this item.

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Type

• Multimedia Player Software

Vendor

• Adobe

Name

• Flash

License

• commercial

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