Tried, Tested and Proven

Vulnerability title: Denial Of Service In Sophos Anti Virus

CVE: CVE-2014-1213
Vendor: Sophos
Product: Anti Virus
Affected Version: 10.0.11/Engine 3.48.x
Fixed Version: 10.0.11/Engine 3.50
Reported by: Graham Sutherland


The following system objects do not have access control lists (ACLs) set, thus allowing any user to access and manipulate them:

Global objects (in namespace \Global, a.k.a. \BaseNamedObjects):


Session objects (in namespace \Sessions\n\BaseNamedObjects):



By manipulating these objects, we found that we could cause the following problems:

Local denial of service by setting a locked or fired state on all mutexes and events. Machine becomes sluggish, certain features stop working, OS locks up and eventually BSoDs. We suspect that this is caused by an object wait call (e.g. WaitForSingleObject) in a kernel thread.

False display of “ready for update” message popup by repeatedly triggering the ReadyForUpdateSAV events and UpdateComplete / UpdateMutex / UpdateRequest objects.


The proof of concept exploit code is available.

Vendor status:

18/10/2013 Advisory created
11/11/2013 Vendor contacted
23/11/2013 Vendor working on a fix
14/01/2014 CVE obtained
21/01/2014 Fix released (Engine v 3.50)
23/01/2014 Fix confirmed
31/01/2014 Published

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