UNIX

As many of our regular readers will know, the Portcullis Labs team have a good deal of experience with reviewing the security of POSIX alike OS, and as a result, we’ve made some interesting discoveries in terms of how easy it can be to escalate ones privileges. As I discussed some time ago at CRESTCon, one particular avenue of attack that we like is the runtime linker itself. As part of our ongoing research, I’ve recently issued a request for comments for a patch that tackles a number of systemic weaknesses in the Linux (glibc) runtime linker that we often exploit. A few further points on the rationale… Continue reading

Some bugs are so simple and so elegant that you wonder how it is possible that no one has found them until now. Those are my favorites. They are simple, they do not involve memory corruption and most of the time they do not even need an advanced exploit code to abuse it. Stéphane Chazelas’ Bash bug is one of these bugs. Continue reading

NOPC (Nessus-based Offline Patch Checker) is patch-checker for UNIX systems. It is a shell script that utilises Nessus’ nasls and gives instructions on what data is needed to be obtained from the system to perform to derive a list of missing security patches. This was developed for situations when network connectivity to the systems under review is not possible. Continue reading