No error here: Microsoft deploying Chinese censorship on global scale

Microsoft has responded to our research about Bing search results after initially responding with a “no comment”. We have actually already addressed most of their rebuttal in our original article. Here are the highlights. From Microsoft:

We’ve conducted an investigation of the claims raised by First, Bing does not apply China’s legal requirements to searches conducted outside of China. Due to an error in our system, we triggered an incorrect results removal notification for some searches noted in the report but the results themselves are and were unaltered outside of China.

We sent our research findings to Microsoft before publishing our blog post with an explicit query as to whether or not the odd search results were the result of a technical mistake. Microsoft originally responded by saying: “Thanks for your inquiry. We have no comment on this topic.”.

Microsoft says: “[T]he results themselves are and were unaltered outside of China”. This is simply not true. Please refer to the comparison chart in our original blog post. The Guardian confirmed our testing results concerning the 达赖喇嘛 (Dalai Lama) and did their own tests for 薄熙来 (Bo Xilai). The newspaper reported:

A search on Bing in Chinese for Bo Xilai (薄熙来), the former high-flying Chinese government official now serving life imprisonment for corruption, shows equally different results. The top search result is again Baidu Baike. Wikipedia is the third entry. There are no western reports on the politician on the front page. In English the search is topped by Wikipedia, then by stories from the New York Times, BBC and Financial Times.

A Google search in Chinese starts with the Wikipedia page and then several news articles chronicling his downfall from sources including the BBC and Voice of America.

Most results are partially censored and hard to detect if you don’t read Chinese. But we selected a term that is completely censored so that even a non-Chinese reader can easily confirm that the censorship exists. Please click this link to do your own testing.

This notice translates to “Due to legal obligations imposed by Chinese laws and regulations, we have removed the results for these search terms. For more information, please see here.”

In addition, Microsoft has failed to address our point on the censorship policy for international Bing in China. We have shown that this version is heavily censored but Microsoft has again failed to comment on this issue.

With regards to the homepage being absent from Bing search results, our investigation indicates that at some time in the past the page was marked as inappropriate due to low quality or adult content. After review, we have determined the page is acceptable for inclusion in global search results.

Bing aims to provide a robust set of high-quality, relevant search results to our users. In doing so, Bing has extremely high standards that respect human rights, privacy and freedom of expression.

As we explained in our blog post, we tested a search for “FreeWeibo” with safe search turned off. If the setting is off, often a search engine will return adult content. Ever with safe search “off” our index is still not shown, which runs contrary to Microsoft’s explanation. You can easily verify this for yourself. First turn off safe search, then click this link to confirm that none of the results come from

Microsoft’s alternate claim is that our site is “low quality”. is widely quoted and linked to by international media such as BBC and The Guardian. The website has a Google page rank of 5 out of 10 (by way of comparison, has a page rank of 7/10). would be in no way marked as spam content.

Microsoft is a signatory to the Global Network Initiative, which is an effort by a multi-stakeholder group of companies, civil society organizations (including human rights and press freedom groups), investors and academics to protect and advance freedom of expression and privacy on the Internet. As part of our commitment to GNI, Microsoft follows a strict set of internal procedures for how we respond to specific demands from governments requiring us to block access to content. We apply these principles carefully and thoughtfully to our Bing version for the People’s Republic of China.

We are happy Microsoft has signalled its intention to operate according to GNI principles, but we again reiterate our call that they release a transparency report for Bing, worldwide. We also believe that this is the perfect time for Microsoft to drop its excessive global censorship policy on any version outside of China and International bing inside China.

This story shines a negative light on both Microsoft and China. We fully expect the Chinese authorities to continue with their draconian censorship practice. But for Microsoft, this is an enormous opportunity - do the right thing and stand up to Chinese censorship now. It has damaged your credibility with customers and China’s efforts to boost its image overseas.


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Thu, Sep 24, 2015

Apple blocked CNNIC CA months after MITM attacks

In March of this year, Google found unauthorized digital certificates for several Google domains. The root certificate authority for these domains was the China Internet Network Information Center (CNNIC). CNNIC was controlled by the Chinese government through the Ministry of Industry and Information Technology and is now under the management of the Cyberspace Administration of China (CAC). CNNIC was recognized by all major browsers as a trusted Certificate Authority. If CNNIC signs a fake certificate used in a man-in-the-middle attack, no browser will warn of any unusual activity unless the certificate is pinned.

Wed, Sep 23, 2015

Malicious Xcode could spread via download manager Xunlei

What’s at stake?

We reported last week that popular Chinese iOS apps were compromised in an unprecedented malware attack. We discovered that the source of the infection was compromised copies of Xcode hosted on Baidu Pan. Apple has published an article urging developers to download Xcode directly from the Mac App Store, or from the Apple Developer website and validate signatures. We’ve now discovered that even if a developer uses a download link seemingly from Apple, he might still be possible to obtain a compromised copy of Xcode.

Please note that we do not have evidence that such attacks has happened. But it is an easy attack that anyone can implement.

How does it work?

This compromise happened because of Xunlei. Xunlei is the most popular download manager in China. Much of its popularity is due to the fact they can accelerate download speeds by pulling resources from other Xunlei users as well as cached copies on the Xunlei server. All of this, however, is invisible to users. Users can simply enter a regular http download address into Xunlei  download manager and the download will start. Chinese developers were using direct download addresses such as to download Xcode.

Mon, Sep 21, 2015



Sat, Sep 19, 2015

Popular Chinese iOS apps compromised in unprecedented malware attack

What happened?

According to recent reports, some versions of Xcode used by developers in China have been compromised and are being used to inject tracking codes in iOS apps without developer knowledge. (1,2). Unaware of the injection, those developers then released their compromised iOS apps to the App Store which were then later approved by Apple. At the time of writing this post, the compromised apps are still available in the App store. Any user who has installed and launched these compromised apps will be a victim of these tracking codes.

This is a significant compromise of Apple’s app store. Apple notoriously manually reviews all app submissions and, in comparison to Android stores, has been relatively malware-free. This is the most widespread and significant spread of malware in the history of the Apple app store, anywhere in the world.

The compromised version of Xcode was hosted on Baidu Pan. It is unlikely that Baidu was aware of the compromised version of Xcode. The company removed the files yesterday when news of the compromise surfaced. Because of slow download speeds from foreign websites in China, many Chinese developers prefer to download apps from domestic websites. Many Chinese also use download software like Xunlei, rather than downloading directly from the official Mac App Store.

According to users reports, many prominent Chinese apps are affected. We have included links to the compromised apps in the list below but DO NOT DOWNLOAD these apps. We are simply linking to them so that users can recognize the apps. Affected apps include:  

Wechat The most popolar messaging app in China 

Wed, Sep 16, 2015



Roya, David, Nick, nweaver, Vern, 和我刚刚完成了关于GFW主动探测系统的研究。这个系统在几年前就被用来探测翻墙工具,比如Tor。我们在之前的博文中介绍过GFW主动探测系统是如何工作的。但有几个问题我们没有回答。比如这个系统的物理结构是怎样的。那些用来主动探测的IP是归GFW所有的么? 有猜测GFW短时间内劫持了部分IP来用来主动探测,但没有证据。这次研究回答了这些问题。


  • 通常来说,如果Tor的某个网桥代理被GFW检测并封锁,它会一直被封锁。但是这意味着网桥代理完全无法访问吗? 我们让中国的VPS一直连接我们控制的网桥代理。我们发现,每25小时,中国的VPS可以短暂的连接到我们的代理网桥。下图显示了这个现象。每个数据点表示中国的VPS试图与网桥代理建立连接。中国联通和中国教育网都有这个周期性现象。有时候,网络安全设备在更新规则时会默认允许所有流量,但我们不知道GFW周期性现象是不是因为这个原因导致的。

  • 我们找到了规律,GFW主动探测的TCP头暗示那几千个IP都来自与同一个地方。下图显示了数据包的初始序号和时间。每个数据点都是一个主动探测连接。如果每个主动探测都是从不同地方发出的,我们应该看到随机的数据点,因为数据包的初始序号是随机选择的。但是下图显示主动探测连接虽然来自不同IP,但是非常有规律。我们认为主动探测的初始序号是按照时间产生的。


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