kernel.org服务器遭入侵

phoenixlzx · 2011-09-01 16:07:09

Security breach on kernel.org

Earlier this month, a number of servers in the kernel.org infrastructure were compromised. We discovered this August 28th. While we currently believe that the source code repositories were unaffected, we are in the process of verifying this and taking steps to enhance security across the kernel.org infrastructure.

What happened?

Intruders gained root access on the server Hera. We believe they may have gained this access via a compromised user credential; how they managed to exploit that to root access is currently unknown and is being investigated.
Files belonging to ssh (openssh, openssh-server and openssh-clients) were modified and running live.
A trojan startup file was added to the system start up scripts
User interactions were logged, as well as some exploit code. We have retained this for now.
Trojan initially discovered due to the Xnest /dev/mem error message w/o Xnest installed; have been seen on other systems. It is unclear if systems that exhibit this message are susceptible, compromised or not. If developers see this, and you don't have Xnest installed, please investigate.
It *appears* that 3.1-rc2 might have blocked the exploit injector, we don't know if this is intentional or a side affect of another bugfix or change.

What Has Been Done so far:

We have currently taken boxes off line to do a backup and are in the process of doing complete reinstalls.
We have notified authorities in the United States and in Europe to assist with the investigation
We will be doing a full reinstall on all boxes on kernel.org
We are in the process of doing an analysis on the code within git, and the tarballs to confirm that nothing has been modified

The Linux community and kernel.org take the security of the kernel.org domain extremely seriously, and are pursuing all avenues to investigate this attack and prevent future ones.

However, it's also useful to note that the potential damage of cracking kernel.org is far less than typical software repositories. That's because kernel development takes place using the git distributed revision control system, designed by Linus Torvalds. For each of the nearly 40,000 files in the Linux kernel, a cryptographically secure SHA-1 hash is calculated to uniquely define the exact contents of that file. Git is designed so that the name of each version of the kernel depends upon the complete development history leading up to that version. Once it is published, it is not possible to change the old versions without it being noticed.

Those files and the corresponding hashes exist not just on the kernel.org machine and its mirrors, but on the hard drives of each several thousand kernel developers, distribution maintainers, and other users of kernel.org. Any tampering with any file in the kernel.org repository would immediately be noticed by each developer as they updated their personal repository, which most do daily.

We are currently working with the 448 users of kernel.org to change their credentials and change their SSH keys.

We are also currently auditing all security policies to make kernel.org more secure, but are confident that our systems, specifically git, have excellent design to prevent real damage from these types of attacks.

kernel.org网站首页发布公告，声称多台服务器在本月初（8月12日前）遭黑客攻击，他们在8月28日发现了入侵。入侵者利用一位用户凭证获得了服务器根访问权限，他们正在调查黑客是如何提升权限的；系统启动脚本被加入了一个木马启动文件；ssh相关文件被修改。kernel.org声称，他们相信Linux kernel源代码库未受影响，因为git分布式版本控制系统的特性决定了它可以很容易注意到代码变化。但如果黑客向源代码库丢入一个恶意补丁，要分辨出来也并非易事。

:em20 :em19 :em70

长头发的和尚 · 2011-09-01 18:01:58

杯具...

cuihao · 2011-09-01 22:21:38

:em70 求黑客入侵M$总部公布源代码。

Arch Linux

#1 2011-09-01 16:07:09

kernel.org服务器遭入侵

#2 2011-09-01 18:01:58

Re: kernel.org服务器遭入侵

#3 2011-09-01 22:21:38

Re: kernel.org服务器遭入侵

页脚