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                         AUSCERT Security Bulletin

                               ASB-2012.0130
             An issue has been identified in Sophos Anti-Virus
                             20 September 2012

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Sophos Anti-Virus
Operating System:     Windows
Impact/Access:        Reduced Security -- Unknown/Unspecified
Resolution:           Mitigation
Member content until: Saturday, October 20 2012

OVERVIEW

        An issue has been identified in Sophos Anti-Virus which is causing 
        false positives to be detected. [1]


IMPACT

        The vendor has provided the following details regarding this issue:
        
        "Numerous binaries are falsely detected as Shh/Updater-B." [1]
        
        "An identity released by SophosLabs for use with our Live Protection 
        system is causing False Positives against many binaries that have 
        updating functionality.
        
        Detections of ssh/updater-B made today are false positives and not an 
        outbreak." [1]


MITIGATION

        The vendor has provided the following instructions to rectify this 
        issue:
        
        "If you have Live Protection enabled, you should stop seeing these 
        detections eventually as the files are now marked clean in the Live 
        Protection cloud. If you do not have Live Protection enabled you will 
        stop seeing the new detections once javab-jd.ide has been downloaded by 
        your endpoints (released at Wed, 19 Sep 2012 18:48:35 +0000).
        
        There is no cleanup for this detection, and you will see it quarantined 
        unless you have your on-access policy set to move or delete detections 
        if cleanup is not possible. Please double check your SAV policy under 
        cleanup; You want to ensure your secondary option (when cleanup is not 
        available or does not work) to be set to deny access and not delete or 
        move. Once the detections have stopped, you can acknowledge the alerts 
        in the Console, this way you can see who is still reporting it, and 
        confirm it is trending down." [1]
        
        "You should ensure that endpoints are up to date with the latest IDE 
        files.  This issue is resolved with javab-jd.ide which was released at 
        Wed, 19 Sep 2012 18:48:35 +0000.
        
        Sophos Update Manager unable to update
        
        If SUM is unable to update it is probable that files in the warehouse 
        are failing to be decoded as they are being falsely detected as 
        Shh/Updater-B.
        
        To workaround this issue and successfully download the IDE file that 
        fixes this issue follow these steps:
        
            1. Delete agen-xuv.ide from C:\Program Files\Sophos\Sophos Anti-Virus\ 
               [C:\Program Files (x86)\Sophos\Sophos Anti-Virus\]
            2. Restart the 'Sophos Anti-Virus Service'
            3. Update SUM via the Sophos Enterprise Console
        
        Endpoints unable to update
        
        If you have endpoints that are unable to update due to the false 
        positive issue the following steps can be taken to get the fixed IDE 
        to them:
        
            1. Centrally disable On-Access scanning via policy in SEC
            2. Select Groups in SEC and select 'Update Now'
            3. Once a group has updated re-enable On-Access scanning via 
            policy in SEC" [1]


REFERENCES

        [1] Advisory: Shh/Updater-B False positives
            http://www.sophos.com/en-us/support/knowledgebase/118311.aspx

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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