This week Jonathan Bennett and Dan Lynch chat with Pádraig Brady about Coreutils! It’s been around since the 90s, and is still a healthy project under active development. You’ve almost certainly used these tools whether you realize it or not! What’s the relationship with the other coreutils implementations? And why is GNU Coreutils the most cautious of them all?
Continue reading “FLOSS Weekly Episode 797: Coreutils — Don’t Rm -r Up The Tree”
You may have heard about a very large data breach, exposing the Social Security numbers of three billion individuals. Now hang on. Social Security numbers are a particularly American data point, and last time we checked there were quite a few Americans shy of even a half of a billion’s worth. As [Troy Hunt] points out, there are several things about this story that seem just a bit odd.
First up, the claim is that this is data grabbed from National Public Data, and there’s even a vague notice on their website about it. NPD is a legitimate business, grabbing data on as many people as possible, and providing services like background checks and credit checks. It’s not impossible that this company has records on virtually every citizen of the US, UK, and Canada. And while that’s far less than 2.9 billion people, it could feasibly add up to 2.9 billion records as was originally claimed.
The story gets strange as we consider the bits of data that have been released publicly, like a pair of files shared with [Troy] that have names, birthdays, addresses, phone numbers, and social security numbers. Those had a total of 2.69 billion records, with an average of 3 records for each ID number. That math is still just a little weird, since the US has to date only generated 450 million SSNs and change.
So far all we have are partial datasets, and claims on the Internet. The story is that there’s a grand total of 4 TB of data once uncompressed. The rest of the details are unclear, and it’s likely to take some time for the rest of the story to come out. Continue reading “This Week In Security: Three Billion SS Numbers, IPv6 RCE, And Ring -2”
This week Jonathan Bennett and David Ruggles chat with John Britton and Mike McQuaid about Homebrew! That’s the missing package manager for macOS; and Workbrew, the commercial offering built on top of it. We cover lots of territory, like why the naming scheme sounds like it was conceived during a pub visit, how Workbrew helps businesses actually use Homebrew, and why you might even want to run Homebrew on a Linux machine!
Continue reading “FLOSS Weekly Episode 796: Homebrew, I’m More Of A Whopper Guy”
You may have heard some scary news about RISC-V CPUs. There’s good news, and bad news, and the whole thing is a bit of a cautionary tale. GhostWrite is a devastating vulnerability in a pair of T-Head XuanTie RISC-V CPUs. There are also unexploitable crashes in another T-Head CPU and the QEMU soft core implementation. These findings come courtesy of a group of researchers at the CISPA Helmholtz Center for Information Security in Germany. They took at look at RISC-V cores, and asked the question, do any of these instructions do anything unexpected? The answer, obviously, was “yes”.
Undocumented instructions have been around just about as long as we’ve had Van Neumann architecture processors. The RISC-V ISA put a lampshade on that reality, and calls them “vendor specific custom ISA extensions”. The problem is that vendors are in a hurry, have limited resources, and deadlines wait for no one. So sometimes things make it out the door with problems. To find those problems, CISPA researchers put together a test framework is called RISCVuzz, and it’s all about running each instruction on multiple chips, and watching for oddball behavior. They found a couple of “halt-and-catch-fire” problems, but the real winner (loser) is GhostWrite.
Now, this isn’t a speculative attack like Meltdown or Spectre. It’s more accurate to say that it’s a memory mapping problem. Memory mapping helps the OS keep programs independent of each other by giving them a simplified memory layout, doing the mapping from each program to physical memory in the background. There are instructions that operate using these virtual addresses, and one such is vs128.v. That instruction is intended to manipulate vectors, and use virtual addressing. The problem is that it actually operates directly on physical memory addresses, even bypassing cache. That’s not only memory, but also includes hardware with memory mapped addresses, entirely bypassing the OS. This instruction is the keys to the kingdom. Continue reading “This Week In Security: GhostWrite, Localhost, And More”
This week Jonathan Bennett and Doc Searls chat with Olaf Kock and Dave Nebinger about Liferay! That’s a Java project that started as an implementation of a web portal, and has turned into a very flexible platform for any sort of web application. How has this Open Source project turned into a very successful business? And how is it connected to most iconic children’s educational show of all time? Listen to find out!
Continue reading “FLOSS Weekly Episode 795: Liferay, Now We’re Thinking With Portals”
It’s a bit of bitter irony, when a security product gets used maliciously, to pull off the exact attack it was designed to prevent. Enter Proofpoint, and the EchoSpoofing attack. Proofpoint offers an email security product, filtering spam and malicious incoming emails, and also handling SPF, DKIM, and DMARC headers on outgoing email. How does an external service provide those email authentication headers?
One of the cardinal sins of running an email server is to allow open relaying. That’s when anyone can forward email though an SMTP server without authentication. What we have here is two nearly open relays, that wound up with spoofed emails getting authenticated just like the real thing. The first offender is Microsoft’s Office365, which seems to completely skip checking for email spoofing when using SMTP relaying from an allowed IP address. This means a valid Office365 account allows sending emails as any address. The other half relies on the way Proofpoint works normally, accepting SMTP traffic from certain IP addresses, and adding the authentication headers to those emails. There’s an option in Proofpoint to add the Microsoft Office 365 servers to that list, and apparently quite a few companies simply select that option.
The end result is that a clever spammer can send millions of completely legitimate looking emails every day, that look very convincing even to sophisticated users. At six months of activity, averaging three millions emails a day, this campaign managed just over half a billion malicious emails from multiple high-profile domains.
The good news here is that Proofpoint and Guardio discovered the scheme, and worked with Microsoft to develop the X-OriginatorOrg header that is now applied to every email sent from or through the Office365 servers. This header marks the account tenant the email belongs to, giving vendors like Proofpoint a simple way to determine email validity. Continue reading “This Week In Security: Echospoofing, Ransomware Records, And Github Attestations”
This week Jonathan Bennett and Katherine Druckman chat with Andres Almiray about JReleaser, the Java release automation tool that’s for more than just Java, and more than just releases. What was the original inspiration for the tool? And how does JReleaser help avoid a string of commits trying to fix GitHub Actions? Listen to find out!
Continue reading “FLOSS Weekly Episode 794: Release Them All With JReleaser”
