funsec mailing list archives
Re: Skype with care
From: Joel Esler <joel.esler () me com>
Date: Fri, 17 May 2013 10:32:08 -0400
Skype is a free tool. You get, what you pay for. Same with Google and their products, etc. On May 16, 2013, at 5:36 PM, Juha-Matti Laurio <juha-matti.laurio () netti fi> wrote:
A different point of view also: http://www.zdnet.com/is-microsoft-reading-your-skype-instant-messages-7000015388/ Juha-Matti Jeffrey Walton [noloader () gmail com] kirjoitti:A couple of follow ups on this.... "Skype backdoor confirmation," http://lists.randombit.net/pipermail/cryptography/2013-May/004224.html and "All Your Skype Are Belong To Us," http://financialcryptography.com/mt/archives/001430.html On Wed, May 15, 2013 at 10:20 PM, Jeffrey Walton <noloader () gmail com> wrote:(Thanks to KW in a private email). http://www.h-online.com/security/news/item/Skype-with-care-Microsoft-is-reading-everything-you-write-1862870.html Anyone who uses Skype has consented to the company reading everything they write. The H's associates in Germany at heise Security have now discovered that the Microsoft subsidiary does in fact make use of this privilege in practice. Shortly after sending HTTPS URLs over the instant messaging service, those URLs receive an unannounced visit from Microsoft HQ in Redmond. A reader informed heise Security that he had observed some unusual network traffic following a Skype instant messaging conversation. The server indicated a potential replay attack. It turned out that an IP address which traced back to Microsoft had accessed the HTTPS URLs previously transmitted over Skype. Heise Security then reproduced the events by sending two test HTTPS URLs, one containing login information and one pointing to a private cloud-based file-sharing service. A few hours after their Skype messages, they observed the following in the server log: 65.52.100.214 - - [30/Apr/2013:19:28:32 +0200] "HEAD /.../login.html?user=tbtest&password=geheim HTTP/1.1" Source: Utrace They too had received visits to each of the HTTPS URLs transmitted over Skype from an IP address registered to Microsoft in Redmond. URLs pointing to encrypted web pages frequently contain unique session data or other confidential information. HTTP URLs, by contrast, were not accessed. In visiting these pages, Microsoft made use of both the login information and the specially created URL for a private cloud-based file-sharing service. In response to an enquiry from heise Security, Skype referred them to a passage from its data protection policy: "Skype may use automated scanning within Instant Messages and SMS to (a) identify suspected spam and/or (b) identify URLs that have been previously flagged as spam, fraud, or phishing links." A spokesman for the company confirmed that it scans messages to filter out spam and phishing websites. This explanation does not appear to fit the facts, however. Spam and phishing sites are not usually found on HTTPS pages. By contrast, Skype leaves the more commonly affected HTTP URLs, containing no information on ownership, untouched. Skype also sends head requests which merely fetches administrative information relating to the server. To check a site for spam or phishing, Skype would need to examine its content. Back in January, civil rights groups sent an open letter to Microsoft questioning the security of Skype communication since the takeover. The groups behind the letter, which included the Electronic Frontier Foundation and Reporters without Borders expressed concern that the restructuring resulting from the takeover meant that Skype would have to comply with US laws on eavesdropping and would therefore have to permit government agencies and secret services to access Skype communications. In summary, The H and heise Security believe that, having consented to Microsoft using all data transmitted over the service pretty much however it likes, all Skype users should assume that this will actually happen and that the company is not going to reveal what exactly it gets up to with this data._______________________________________________ Fun and Misc security discussion for OT posts. https://linuxbox.org/cgi-bin/mailman/listinfo/funsec Note: funsec is a public and open mailing list._______________________________________________ Fun and Misc security discussion for OT posts. https://linuxbox.org/cgi-bin/mailman/listinfo/funsec Note: funsec is a public and open mailing list.
_______________________________________________ Fun and Misc security discussion for OT posts. https://linuxbox.org/cgi-bin/mailman/listinfo/funsec Note: funsec is a public and open mailing list.
Current thread:
- Re: Skype with care Juha-Matti Laurio (May 16)
- Re: Skype with care Jeffrey Walton (May 16)
- Re: Skype with care Joel Esler (May 17)