Let’s Encrypt, a free-to-use nonprofit, issues certificates that encrypt the connections between your devices and the wider internet, ensuring that nobody can intercept and steal your data in transit. Millions of websites alone rely on Let’s Encrypt. But, as warned by security researcher Scott Helme, the root certificate that Let’s Encrypt currently uses — the IdentTrust DST Root CA X3 — was set to expire on September 30. After expiry, computers, devices and web clients — such as browsers — will no longer trust certificates that have been issued by this certificate authority.
A seven-year-old privilege escalation vulnerability that’s been lurking in several Linux distributions was patched last week in a coordinated disclosure. In a blog post on Thursday, GitHub security researcher Kevin Backhouse recounted how he found the bug (CVE-2021-3560) in a service called polkit associated with systemd, a common Linux system and service manager component.
Introduced in commit bfa5036 seven years ago and initially shipped in polkit version 0.113, the bug traveled different paths in different Linux distributions. For example, it missed Debian 10 but it made it to the unstable version of Debian, upon which other distros like Ubuntu are based.
Formerly known as PolicyKit, polkit is a service that evaluates whether specific Linux activities require higher privileges than those currently available. It comes into play if, for example, you try to create a new user account. Backhouse says the flaw is surprisingly easy to exploit, requiring only a few commands using standard terminal tools like bash, kill, and dbus-send. “The vulnerability is triggered by starting a
dbus-send command but killing it while polkit is still in the middle of processing the request,” explained Backhouse.
The App Tracking Transparency policy is now live in iOS 14.5, so users can choose if they want to allow apps to track them across other apps and websites or just block them on the first launch. Needless to say, this has caused a storm of criticism against Apple, but on the other hand, the company has already defended its decision, explaining that it’s all for protecting user privacy.
The release of this new feature came alongside a new set of policies supposed to prevent cases when app makers turn to all kinds of tricks to convince users to enable tracking. Including offering incentives, that is, as Apple says that apps implementing such an approach might end up being blocked in the App Store.
Internet service was down for about 900 customers in Tumbler Ridge, B.C., after a beaver chewed through a crucial fibre cable, causing “extensive” damage. In a statement, Telus spokesperson Liz Sauvé wrote that in a “very bizarre and uniquely Canadian turn of events,” crews found that a beaver chewed through the cable at multiple points, causing the internet to go down on Saturday at about 4 a.m.
“Our team located a nearby dam, and it appears the beavers dug underground alongside the creek to reach our cable, which is buried about three feet underground and protected by a 4.5-inch thick conduit. The beavers first chewed through the conduit before chewing through the cable in multiple locations,” the statement said.
Sauvé said that a photo from the site appeared to show the beavers using Telus materials to build their home. She said the image shows fibre marking tape, usually buried underground, on top of their dam.