Skype for Mac 5.x: Pure Hacking Discovered 0-day Vulnerability Addressed

Article by George Norman (Cybersecurity Editor)

on 09 May 2011

Pure Hacking, a group of ethical hackers from Australia, uncovered a 0-day vulnerability that plagues version 5.x of Skype for Mac; the Windows and the Linux versions of Skype are not affected. Here are the details Pure Hacking released about this vulnerability: if someone in the Contact list sends you a specifically crafted message, your Skype for Mac would crash.

By default, Skype for Mac does not accept messages from people who are not in the Contacts list, which means someone who is not on the list could not exploit the vulnerability and crash Skype for Mac. The person trying to exploit this vulnerability would have to already be in the Contact list or trick the user into adding him to the list.

The group of ethical hackers contacted Skype to tell the company about the vulnerability. The good news is that when Pure Hacking contacted Skype, Skype was already aware of the vulnerability and was working on a fix. The even better news is that the vulnerability has been fixed in Skype for Mac version 5.1.0.922, an update that you will have to get manually (either by clicking Skype -> Check for updates or by downloading it straight from Skype here).

Skype explained that because it did not see any reports of the vulnerability being exploited in the wild, users will not be prompted to get Skype for Mac version 5.1.0.922. “As there were no reports of this vulnerability being exploited in the wild, we did not prompt our users to install this update, as there is another update in the pipeline that will be sent out early next week,” said Skype’s Chief Information Security Officer Adrian Asher on Friday, the 6th of May.

Asher went on to say that the update that is in the pipeline will contain additional big fixes and that when it will be rolled out, Skype for Mac users will be prompted to get the update.


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