Linux

48248 readers

132 users here now

From Wikipedia, the free encyclopedia

Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

Rules

Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
No misinformation
No NSFW content
No hate speech, bigotry, etc

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago

MODERATORS

[email protected]

342

Root access vulnerability in glibc library impacts many Linux distros (securityaffairs.com)

submitted 9 months ago by [email protected] to c/[email protected]

82 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 148 points 9 months ago (2 children)

For your convenience:

The researchers pointed out that the vulnerability cannot be exploited remotely. An attacker can trigger the issue by providing crafted inputs to applications that employ these [syslog] logging functions [in apps that allow the user to feed crafted data to those functions].

This is a privilege escalation.

[–] db2 52 points 9 months ago (1 children)

The hero we need."; DROP TABLE "users";

[–] [email protected] 7 points 9 months ago

If it isn't little Bobby Tables again.

[–] [email protected] 4 points 9 months ago (1 children)

This may be difficult to exploit in practice - I don't think most user applications use syslog.

[–] [email protected] 1 points 9 months ago (1 children)

Unless you have user access to a system with gcc on it.

[–] [email protected] 9 points 9 months ago

You still need some privileged process to exploit. Glibc code doesn't get any higher privileges than the rest of the process. From kernel's point of view, it's just a part of the program like any other code.

So if triggering the bug in your own process was enough for privilege escalation, it would also be a critical security vulnerability in the kernel - it can't allow you to execute a magic sequence of instructions in your process and become a root, that completely destroys any semblance of process / user isolation.