That also applies to Android: More details of the vulnerability can be gleaned from here , here , and here. Because it was available for anyone to take, modify, and reuse Linux, it proliferated rapidly. According to Phil Oester , the researcher who found the bug, an exploit taking advantage of Dirty Cow has already been found in the wild. Though the proof-of-concept exploit does not actually attain root access, attacking the system using this vulnerability makes that quite simple. However, this vulnerability allows for escalating the privilege of a user space process, granting it super user privileges. But for millions of other devices that run Linux, particularly embedded versions of the operating system, the patch will be difficult to apply, and potentially nonexistent.
Though the proof-of-concept exploit does not actually attain root access, attacking the system using this vulnerability makes that quite simple. Dirty Cow The operating system that lies at the core of most servers on the internet and most smartphones has a critical vulnerability which has existed, unnoticed, for nine years. In fact, research published this week claimed that the typical Linux bug reaches about five years old before it is fixed. As to who is being targeted, anyone running Linux on a web facing server is vulnerable. For the past few years, I have been capturing all inbound traffic to my webservers for forensic analysis. Any Android device running a Linux kernel version greater than 2. Because it was available for anyone to take, modify, and reuse Linux, it proliferated rapidly. More details of the vulnerability can be gleaned from here , here , and here. After further work by developers on demonstrating the effectiveness of exploiting Dirty Cow on Android, one developer was able to successfully root his HTC device within seconds by exploiting the vulnerability. The company has posted a Partner Security Advisory to alert Android partners, one of the steps to those partners then issuing a patch Topics. Go to reply no. In more technical terms, the bug involves a race condition of the Linux memory duplication technique known as copy on write. This article is over 1 year old The Dirty Cow logo. This post was edited by bravonova5 at This practice has proved invaluable on numerous occasions, and I would recommend it to all admins. However, this vulnerability allows for escalating the privilege of a user space process, granting it super user privileges. The bug is already patched on some of the major versions of Linux, including Red Hat , Debian and Ubuntu. The security vulnerability is said to be rather trivial to exploit, and indeed within mere days of the vulnerability being made public a proof-of-concept privilege-escalation exploit has been demonstrated for all Android devices. Dirty Cow in itself is not an exploit, but rather a vulnerability. Google declined to comment, but confirmed that Android is one of the Linux distributions affected. According to Phil Oester , the researcher who found the bug, an exploit taking advantage of Dirty Cow has already been found in the wild. A privilege-escalation exploit was recently discovered last week, and although it has already been patched in the mainline Linux kernel, the bug could potentially be exploited on nearly every Android phone on the market until each device receives the appropriate kernel patch. The vulnerability is easiest exploited with local access to a system such as shell accounts. In this case, I was able to extract the uploaded binary from those captures to analyze its behavior, and escalate to the appropriate Linux kernel maintainers. While top-end Android devices, such as the Galaxy S7 and Pixel, receive regular security updates, the vast majority of Android devices sold receive few, if any, post-sale updates.
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