Older blog entries for huagang (starting at number 7)

6 Mar 2004 (updated 6 Mar 2004 at 10:26 UTC) »
XATTR/EA support is coming out

After almost 2 weeks hard working..XATTR/EA is working with LIDS now. the supporting lidstools also has the support to "-A" , "-D"..but the code still need to clean up before release.

With XATTR support, LIDS will have better performance vs old way. Because the ACL now store in inode->xattr and the checking will not need a big loop to get its own ACL.

Kernel hacking/programming is more difficult than user space programming, is because you need to know how the kernel implement first. But good thing is, the source is there, you can always check it by yourself.

Thanks to Chris Wright of ODSL for the support.

LIDS 2.0.4pre1 for 2.6.2 is out

This version merge the fixed from purna. put it on www.lids.org

23 Jan 2004 (updated 23 Jan 2004 at 22:17 UTC) »

LIDS new version

Purna just sent me a patch to fixed some minor bugs in 2.0.3. just tested it and seems ok for me.

Seems Kernel 2.6.2 will be out, maybe I will just test for a few days and wait to release a version for 2.6.2.

NT ROOTKIT

From a post on bugtraq, I track down to a rootkit website http://www.rootkit.com . It contains a lot of useful downloads for various rootkit.

1. FU_rootkit.

This rootkit use a device driver and a userspace application which can then hide process, change the privilege of a process/thread, etc. It works on windows NT/2k/XP. The technology seems the same as linux rootkit which need a kernel modules to complete the job.

The interface between the userspace and kernel space is via the IOCTL command, and it has been defined specifically in the deveice driver code. It is easy to extend it and make it work more extensive.

2. Winlogon_injection.

This one use DLL Injection Technic to do the job. In most case, the DLL Injection will allocate a memory in the process, and copy the code into that area and then change the privlege of the that area, and finally change the EIP to pointer that the entry of the injected code.

The most intersting part is where the code injected and where should I change the runing route to the injected function.

Some other interesting stuff is on the website. Go get your own.

16 Jan 2004 (updated 16 Jan 2004 at 22:14 UTC) »

Qmail crash bug??

http://www.guninski.com/qmailcrash.html show a code for a overly long smtp message-body data will make qmail crash and even executing code. The problem is no one will send such a big file > 0x80000000 bytes, so it maybe safe for this kind of software to have a restriction on the data they received. and that will make things easier.

Integer overflow is hard to find but easy to exploit. Do some asserting on "int" "unsigned int" etc could help. I guess.

16 Jan 2004 (updated 16 Jan 2004 at 22:16 UTC) »
Play with RSS

seems work perfect.

RSS is pretty nice..actually, a very useful mailing RSS is at http://www.djeaux.com/rss, I also use the ISC's xml feed.

16 Jan 2004 (updated 16 Jan 2004 at 22:29 UTC) »
kernel mremap bug

An interesting bug, people in isec.pl is really genius :-)..they found and wrote several critical bug already. http://isec.pl/vulnerabilities/isec-0013-mremap.txt

When I tried the code, the kscand (a kernel thread) come to OOPS and after a while, no process can be forked. I just gave up.

The idea is to use the 0-size vma to overwrite a children's vma counter, to make it to 1 and when exit, kernel will make it into a free-list and then reused it to other propose, but the parent still have access to this page which can then read/write to the task-structure. <">

My first log.
try to see if it works?

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