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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== 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. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUFps0O4yVqjM2NGpAQI2jw/9GlEsH6eUhpZa25N1xnu4gJqurEeA9i6E HwQkHqYWyuoKPi1UcA9+KLrDoAIkuCYTGaAQLVn4xHUhX2iSMxvMuYAqSqhfu+pR XSmhJ2OToOadzmGVc6YzkuVWrksd7bkWFUAT0K5YEN5/3Vm+H4+bU/yibsYf81PF Vt4FQGhYA94OUBN8n3pSZ+2Lu9in7tBv+08Qzm7vfBwxnR2+mqzMLl7QArSdhTJR yJqCK+UWIf9May2f33D/8CXrWciV9CZSGuboMQe1X+pn9AbnzYtWKaZ0BYGTF9XA SFmrgn+d1VqGMXQr+jx4MQv+EbTaFtlRdD9ZNHj7ifb+sf5nTm271/ekQCf8Mdn1 Yd/e/Ljr4/jRdbX+blK8JtkkKUKh3tL+tzTAiiZYSSZLc2adpQvgNINGmYmiXC1B mrJ7KhMZLUTSrdWQAMZLckWyJJ/IxcZ0UI0h5T7OHanypONEBsQ0+9r/ndZT4VBW Ce1OE2apXWHDYCmHwENO7+j90T41MIzeQ1c/4tqZNEDMkpEE+amWSJcDZW37lXhV I6VkPM5tkgJ5MWgmIOJ/188eRLfWFuNR7NBiUFrmdGPwdlWzWqSwzAe8eGxAhrnV xGDHdPXgBh38rqjJsFvV5Uy9KyLyg1I71GPpBq1doBi1SuSHfSjsjtRSAyPEi/oR xEJ/9qKRIh8= =XBk6 -----END PGP SIGNATURE-----