AthCon 2010 is now over and I must say that I’m really looking forward to next year’s event! Kudos to Christian, Kyprianos, Fotis, Chariton, Bernardo, Sandro, Iftach, Corrado, Rodrigo, Alberto and everyone else for making this such a great event!
The main theme of my presentation was “Context-keyed payload encoding”, a shellcode encoding technique that allows attackers to evade detection from NIDS that employ dynamic payload analysis.
read more...| census ID: | census-2010-0001 |
| CVE ID: | CVE-2010-2020 |
| Affected Products: | FreeBSD 8.0-RELEASE, 7.3-RELEASE, 7.2-RELEASE |
| Class: | Improper Input Validation (CWE-20) |
| Remote: | No |
| Discovered by: | Patroklos Argyroudis |
We have discovered two improper input validation vulnerabilities in the FreeBSD kernel’s NFS client-side implementation (FreeBSD 8.0-RELEASE, 7.3-RELEASE and 7.2-RELEASE) that allow local unprivileged users to escalate their privileges, or to crash the system by performing a denial of service attack.
read more...In my recent Black Hat Europe 2010 talk I gave an overview of the kernel exploitation prevention mechanisms that exist on FreeBSD. A few people at the conference have subsequently asked me to elaborate on the subject. In this post I will collect all the information from my talk and the various discussions I had in the Black Hat conference hallways.
read more...Black Hat Europe 2010 is now over and after a brief ash cloud caused delay I am back in Greece. It has been a great conference, flawlessly organised and with many outstanding presentations. I would like to thank everyone that attended my presentation but also all the kind people that spoke to me before and afterwards. I hope to meet all of you again at a future event.
This article is a followup to our last year’s advisory on canary randomisation for applications of the Debian distribution.
I was recently asked what the currently employed method is for canary randomisation in SSP-armoured Linux applications. I’ve been meaning to write an article on this for some time now, but didn’t have the necessary time. So here it is (albeit a little late).
read more...| census ID: | census-2009-0004 |
| Affected Products: | Monkey web server versions ≤ 0.9.2. |
| Class: | Improper Input Validation (CWE-20), Incorrect Calculation (CWE-682) |
| Remote: | Yes |
| Discovered by: | Patroklos Argyroudis |
We have discovered a remotely exploitable “improper input validation” vulnerability in the Monkey web server that allows an attacker to perform denial of service attacks by repeatedly crashing worker threads that process HTTP requests.
read more...| census ID: | census-2009-0003 |
| CVE ID: | CVE-2009-3586 |
| Affected Products: | CoreHTTP web server versions ≤ 0.5.3.1. |
| Class: | Improper Input Validation (CWE-20), Failure to Constrain Operations within the Bounds of a Memory Buffer (CWE-119) |
| Remote: | Yes |
| Discovered by: | Patroklos Argyroudis |
We have discovered a remotely exploitable “improper input validation” vulnerability in the CoreHTTP web server that leads to an off-by-one stack buffer overflow. The vulnerability can lead to denial of service attacks against the web server and potentially to the remote execution of arbitrary code with the privileges of the user running the server.
read more...| census ID: | census-2009-0005 |
| Affected Products: | Linux kernel versions from 2.6.32 to 2.6.32-rc7. |
| Class: | Off-by-two stack buffer overflow. |
| Discovered by: | Patroklos Argyroudis |
We have found an off-by-two stack buffer overflow in the Linux kernel SUNRPC implementation. Linux kernel versions from 2.6.32 to 2.6.32-rc7 are affected.
read more...CVE-2008-3531 is a kernel stack overflow vulnerability that affects FreeBSD versions 7.0-RELEASE and 7.0-STABLE, but not 7.1-RELEASE nor 7.1-STABLE as the CVE entry seems to suggest.
read more...