I recommend that pentesters and developers of security scan tools consider checking for this. The directory needs to be writable by all users, you should use a directory with the sticky bit (chmod +t). A very typical example would be passwords. But there are still situations in which PHP crashes. Some of them likely won’t be fixed. Given that its file name is known an attacker can simply download it via an URL of the form https://example. Some abuse contacts seem to automatically search for IP addresses in the abuse mails. These tools like apport from Ubuntu or abrt from Fedora have also been the source of security vulnerabilities in the past. If a web application crashes the coredump may simply end up in the web server’s root folder. However you obviously also want to prevent this from happening again. Among popular web pages around one in a thousand were affected before my disclosure attempts. Some abuse contacts were nonexistent mail addresses, others didn’t have abuse contacts at all. Due to the scale I ignored those. By default it is simply called core. If it is set to zero then no core dumps are created. Recently a lot of these crash bugs have been fixed, in part because PHP now has a bug bounty program. To set this permanently you can add it to /etc/sysctl. I also got all kinds of automated replies, some of them asking me to fill out forms or do other things, otherwise my message wouldn’t be read. I feel that if people make it hard for me to inform them about security problems that’s not my responsibility. How to fix and prevent it. It’s simple: Just try download the /core file and check if it looks like an executable. So I changed that to include the affected IPs as well. Look out for coredumps
My scans showed that this is a relatively common issue. PHP used to crash relatively often. There are two settings that impact coredump creation: A limits setting, configurable via /etc/security/limits. Some of them asked me if they’re allowed to forward the message to them. So I needed an automated way to contact the site owners. I was faced with a challenge: How can I properly disclose this. As coredumps contain an application’s memory they may expose secret information. I thought that would be obvious, but I made it explicit now. Image credit: NASA/JPL-Université Paris Diderot. It is obvious that I wouldn’t write hundreds of manual mails. If you have a coredump on your web host, the obvious fix is to remove it from there. Out file (very old Linux and Unix systems). If you set this via the proc file interface it will only be temporary until the next reboot. If a software crashes, for example due to an invalid memory access, the operating system can save the current content of the application’s memory to a file. I took away two things that I changed in a second batch of disclosures. %t
This would store all coredumps under /var/log/core/ and add the executable name, process id, host name and timestamp to the filename. With a scan of the Alexa Top 1 Million domains for exposed core dumps I found around 1. In many cases I was informed that the affected hosts are not owned by the company I contacted, but by a customer. While this is useful for debugging purposes it can produce a security risk. Coredumps are a feature of Linux and other Unix systems to analyze crashing software. One could also imagine contacting domain owners directly, but that’s not very practical. Conf:
* soft core 0
The sysctl interface sets a pattern for the file name and can also contain a path. This can be done by prefixing the pattern with a pipe (|). The domain whois databases have rate limits and don’t always expose contact mail addresses in a machine readable way. And sorry: They are your customers, not mine. Some of them asked me that I contact their customers, which again, of course, is impractical at scale. Abusix runs a service where you can query the abuse contacts of IP addresses via a DNS query. %t
Some Linux distributions directly forward core dumps to crash analysis tools. To set this as the default you can add something like this to your limits. This turned out to be very useful for this purpose. Using the abuse contacts doesn’t reach all of the affected host operators. In most cases it will be an ELF file, however sometimes it may be a Mach-O (OS X) or an a. I originally only included affected URLs. You can set it to something like this:
/var/log/core/core. The limits setting is a size limit for coredumps. However that’s a separate issue. Conf and ulimit and a sysctl interface that can be found under /proc/sys/kernel/core_pattern.
Rather large strides have gone into getting the Big Desktop Environments to work with Wayland. The last few days I have been working on Xorg & Wayland/Weston packages. 4 is said to have some support (though limited to one platform. I wanted to play with Wayland and see if I could get some type of graphical interface up and running. So my investment in getting familiar with Wayland and maybe getting something to work, I don’t feel will be wasted. There’s other environments that are embracing Wayland, Hawaii Desktop is an interesting one, Moonlight, and the most interesting Enlightenment 20. Wayland and Weston have come first for the simple fact they are easier to pull in and can be compiled to run with minimal (or no) Xorg dependencies. 18 is said to work really well and KDE/Plasma 5.
At this point in development Unity Linux as what it is today is moving from a proof of concept, which might work. It also marks a huge milestone. This marks the first desktop environment to run on Unity Linux as an official Linux distribution in years. To coming back as an actual Linux Distribution. Last week OnlyHuman and I were able to get Enlightenment 19 up and running on Unity Linux.
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So here I got to my first contributions to Scylla to get Gentoo Linux as a detected and supported Linux distribution in the different scripts and tools used to automatically setup the machine it will run upon (fear not, I contributed bash & python, not C++).
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In this particular case of Audacity, the problematic library is referenced in the error above: “wx containers”. So, I simply needed to rebuild the currently-installed version of wxGTK to fix this particular problem. WX containers are handled by the wxGTK package. The Gentoo Wiki has a nice, detailed page on Upgrading GCC, and explicitly calls out ABI changes.
Others on Planet GNOME have written extensively about the talks, the social events, and everything in between that made it a great experience. What I would like to write about is about why this year’s GUADEC was special to me. The conference was absolutely lovely, the organisation was a 110% on point (serious kudos, I know first hand how hard that is).
Taking a real example, compare:. Violation of this syntax prevents pkgcheck from performing any of the remaining checks. But more importantly, the report indicates that the constraint is unnecessarily complex and could result in REQUIRED_USE mismatch messages that are unnecessarily confusing to the user.
If you don’t want to get to technical in how we are getting there you can stop reading now. So that is where we are going. However, there are quite a few steps that need to be taken in my mind to get us from where we are now, to something release worthy.
Today I investigate the missing information on the livepatch that we have when we don’t have CONFIG_DEBUG_INFO=y in our kernel configuration. This DEBUG_INFO is only needed for making the livepatch and dosen’t have to be setted also in production (but not tested it yet). In the case we don’t have debug_info in the kernel configuration we usually get missing alt_instr errors from kpatch-build and this is stopping elivepatch from creating a livepatch.
Then they’ll surely reach the portage tree with the approval of the Gentoo java team for the app-admin/ packages listed above. The scylla packages are located in the ultrabug overlay for now until I test them even more and ultimately put them in production.